How Many Calories Should I Eat to Lose Weight?

Short answer: take your TDEE, which is the number of calories your body burns in a typical day, and subtract 250 to 750 calories. That result is your daily target for steady, sustainable weight loss. Most adults losing weight land somewhere around 1,200 to 1,800 calories per day, but that range is wide, and your own number depends on your size, your age, and how active you are.

This article shows you how to calculate your personal number in three simple steps, with two worked examples, a goal ladder that lets you pick your pace, and a quick shortcut if you do not want to do the full math. By the end, you will know how many calories should I eat to lose weight for your body, pace, and activity level.

Before we start, one distinction is worth making. A calorie deficit is the gap between the calories you eat and the calories you burn, and it is the reason weight loss happens at all. If you want the full explanation of that concept, read our guide on what a calorie deficit is. This article is different. It answers the personal question: how big should your deficit be, and how many calories should you actually eat each day? Think of the other article as the theory and this one as your number.

You can also skip the hand calculation and use our free TDEE calculator or calorie calculator to get your maintenance calories in seconds. The steps below show you exactly how those tools work, so you understand your number instead of just trusting a screen.

The Short Version

A moderately active 150 lb woman eats about 1,600 calories a day to lose about 1 lb per week. A moderately active 200 lb man eats about 2,370 calories a day for the same pace. The CDC recommends a gradual pace of about 1 to 2 lb per week, which is more likely to be kept off than faster loss. Find your own number in the chart below, or use our TDEE calculator for an exact figure.

The 3-Step Formula: How Many Calories Should I Eat to Lose Weight?

Your daily calorie target comes from three steps. First, estimate your BMR, the calories your body needs at rest. Second, multiply it by an activity factor to get your TDEE. Third, subtract a deficit of 250 to 750 calories, depending on how fast you want to lose weight. The next three sections walk you through each step in order. Once you know your TDEE, deciding how many calories should I eat to lose weight is a simple subtraction.

Step 1: Estimate your BMR with the Mifflin-St Jeor equation

The Mifflin-St Jeor equation is the most widely used formula for estimating BMR, and it is the one most calculators use. It needs your weight in kilograms, your height in centimeters, and your age in years. The formulas are:

• Men: BMR = (10 x weight in kg) + (6.25 x height in cm) – (5 x age) + 5
• Women: BMR = (10 x weight in kg) + (6.25 x height in cm) – (5 x age) – 161

BMR is your floor, not your target. It is roughly what you would burn lying in bed all day. You will never actually burn only your BMR, because even a quiet day involves standing, walking to the kitchen, thinking, and digesting food. But BMR matters because it sets a lower boundary, which we will come back to in the section on floors you should not cross. You can also get your BMR instantly with our BMR calculator. If you want to understand how BMR and TDEE relate in more depth, see our comparison of BMR vs TDEE, but for this article, all you need is this: BMR is the resting baseline, and TDEE is the real-world number.

Step 2: Multiply by your activity level to get TDEE

TDEE stands for total daily energy expenditure. It is BMR plus everything else: moving around, exercising, digesting food, and even fidgeting. To estimate it, multiply your BMR by the activity multiplier that best matches your typical week. Be honest here. Most people overestimate how active they are, and an inflated activity level produces an inflated TDEE, which produces a target that is too high to lose weight on.

Activity level	Multiplier	What it looks like
Sedentary	1.2	Desk job, little or no exercise
Lightly active	1.375	Light exercise or sports 1 to 3 days a week
Moderately active	1.55	Moderate exercise or sports 3 to 5 days a week
Very active	1.725	Hard exercise or sports 6 to 7 days a week
Extra active	1.9	Very hard exercise, physical job, or training twice a day

So the formula is: TDEE = BMR x activity multiplier. If your BMR is 1,500 and you are lightly active, your TDEE is 1,500 x 1.375 = 2,063 calories. That is roughly your maintenance level, the amount you would eat to stay the same weight. Learn more about this number in our guide on what TDEE is.

Step 3: Subtract a deficit of 250 to 750 calories

Your target is TDEE minus a deficit. The sensible range for most people is a deficit of 250 to 750 calories per day, which works out to roughly 0.5 to 1.5 lb per week. Smaller deficits are easier to sustain but slower. Larger ones are faster but harder to stick to and more likely to cost muscle, so stay inside the range. Pick the deficit you can actually live with, not the biggest one you can survive for a week. In other words, how many calories should I eat to lose weight comes down to your TDEE minus a deficit you can sustain.

Why does the deficit translate into pounds this way? One pound of body fat stores about 3,500 calories, and one kilogram stores about 7,700 calories. So a daily deficit of 500 calories adds up to about 3,500 calories over a week, or roughly 1 lb per week. A deficit of 250 per day works out to about 0.5 lb per week, and a deficit of 750 per day to about 1.5 lb per week. You can read more about the energy stored in body fat in our article on how many calories are in a pound of fat.

Treat those numbers as approximate, not as promises. Research from the National Institutes of Health has refined the old 3,500-calorie rule and shown that actual rates of loss vary with body composition, hormones, and metabolic adaptation. As you lose weight, your body burns fewer calories, so the same deficit produces slower loss over time. The 3,500-calorie rule is a useful planning tool, not a guarantee. Think of it as a compass, not a stopwatch.

Should I Use BMR or TDEE to Work Out How Many Calories I Should Eat to Lose Weight?

Work from TDEE, your maintenance level, and subtract the deficit from it. TDEE is the number your target is built on.

BMR is the floor you stay above, not your eating target. It is the lower boundary, and your target sits above it by the size of your activity level plus the deficit you choose.

A Note on Newer Estimation Methods

The 3-step formula above is the classic method, and it is kept here because it is simple, transparent, and close enough to start. Two newer methods exist and are worth knowing about. The NIH Body Weight Planner uses a validated dynamic model of metabolism that accounts for how expenditure falls as you lose weight, so its projections slow down over time instead of promising linear loss. The National Academies updated the Dietary Reference Intakes for Energy in 2023, with new energy requirement equations built on expanded doubly labeled water data and physical activity categories. Newer tools built on these equations do not use the 1.2 to 1.9 multiplier table at all; they model expenditure directly, and the Body Weight Planner uses its own activity scale running from 1.4 for sedentary to 2.5 for very active. If your calculator result and your real-world trend disagree for several weeks, trust the trend and check it against the Planner, since no formula beats your own data.

Worked Examples

Formulas are easier to trust when you see them worked through with real numbers. Here are two examples that show every step, including the arithmetic, so you can follow along with your own numbers. If you would rather skip the math, our calorie deficit calculator does all of this for you.

Example 1: A moderately active woman

Take a woman whose BMR works out to 1,437 calories per day. She exercises moderately, about 3 to 5 days a week, so her activity multiplier is 1.55. Step 2 gives her TDEE: 1,437 x 1.55 = 2,227 calories per day. That is her maintenance level.

She wants to lose about 1 lb per week, which calls for the classic 500-calorie deficit. Step 3 gives her 2,227 – 500 = 1,727 calories per day, which we can round to about 1,730. That is a reasonable starting target for steady fat loss. If she tracks it for 3 weeks and loses nothing, she can trim another 10 percent or tighten up her tracking. That 1,730 figure is how many calories should I eat to lose weight for her stats and pace.

Example 2: A woman weighing 70 kg with a TDEE of 1,950

Now consider a woman who weighs 70 kg and whose TDEE is 1,950 calories per day. Her maintenance level is 1,950. The table shows how her daily target changes with each pace. Read across a row to see how many calories should I eat to lose weight at that pace.

Pace	Deficit	Eats per day	Loss per week	Best for
Gentle	About 10 percent (-200)	About 1,750	About 0.2 kg	Last 3 to 5 kg, hate dieting, want zero hunger
Standard	About 20 percent (-400)	About 1,550	About 0.4 kg	The sweet spot for most people
Classic	-500	About 1,450	About 0.45 kg	The round number, same as standard
Aggressive	About 25 percent or more (-500 to -750)	1,200 to 1,450	0.5 to 0.7 kg	Higher body weights, a deadline, short spells only

Example 3: A moderately active man

Take a 35-year-old man who weighs 90 kg and is 178 cm tall. His BMR works out to 1,843 calories per day. He exercises moderately, about 3 to 5 days a week, so his activity multiplier is 1.55. Step 2 gives his TDEE: 1,843 x 1.55 = about 2,857 calories per day. That is his maintenance level.

He wants to lose about 1 lb per week, which calls for the classic 500-calorie deficit. Step 3 gives him 2,857 – 500 = about 2,357 calories per day, which we can round to about 2,360. Notice how different this is from the women’s examples above: the same 1 lb per week pace needs a much higher intake here, because a larger, more muscular body burns more at rest. That is why sex-specific numbers matter, and why the chart above splits women and men instead of giving one unisex figure. If his weight drops, he recalculates the same way, and his target drops with it.

The Goal Ladder: Pick Your Pace

There is no single right pace. The best deficit is the one you can keep for months without feeling miserable. That is why the ladder above is useful. It turns an abstract choice into a concrete trade-off. The gentle rung barely feels like a diet, and it works well when you only have a few kilograms left to lose or when you hate the feeling of restriction.

The standard rung is the sweet spot for most people: fast enough to see progress, gentle enough to live with. The classic 500-calorie deficit lands in almost the same place as the standard rung, which is why it has been the default advice for decades.

The aggressive rung is the one to handle with care. A deficit of 500 to 750 calories at a TDEE of 1,950 pushes daily intake down to 1,200 to 1,450 calories, which is close to the floor. It can make sense for higher body weights, for a short push toward a deadline, or for brief spells, but it is not a good permanent setting. Hunger climbs, energy dips, and the temptation to quit grows. If you choose this rung, set a time limit and a plan to step back up to the standard rung.

One more guardrail applies to every rung: the maximum sustainable pace is about 1 percent of body weight per week. For a 70 kg person, that is 0.7 kg per week, which needs roughly a 770-calorie deficit. In practice, 0.5 to 0.6 kg per week is a more realistic ceiling. Asking for 1 kg per week at 70 kg would mean an 1,100-calorie deficit, eating about 850 calories a day, which crashes below BMR and every reasonable floor. If your goal implies a pace faster than 1 percent per week, the goal is the problem, not your willpower.

How Many Calories to Lose 5 Pounds a Week, or 2 Pounds a Week?

Two goal questions come up so often that they deserve direct answers. Losing 5 lb in a week needs a deficit of about 2,500 calories per day, because 5 lb of fat stores about 17,500 calories and 17,500 divided by 7 days is 2,500 per day. That exceeds most adults’ entire maintenance level. A moderately active 150 lb woman maintains at about 2,113 calories, so a 2,500 deficit is not just hard, it is arithmetically impossible without going below zero. The CDC recommends a gradual, steady pace of about 1 to 2 lb per week, which is more likely to be kept off than faster loss.

Losing 2 lb a week needs a deficit of about 1,000 calories per day. That is possible for some people and impossible for others, and the difference is maintenance level. A moderately active 200 lb man maintains at about 2,868 calories, so a 1,000 deficit leaves about 1,868, which is workable. A moderately active 150 lb woman maintains at about 2,113, so a 1,000 deficit leaves about 1,113, which falls below the general 1,200 floor for women. If your goal implies a pace faster than about 1 percent of body weight per week, or a target below the floors in this article, the goal needs adjusting, not your willpower. Very rapid loss also carries its own risks, including a higher chance of gallstones, which is another reason fast plans belong under medical supervision.

How Many Calories to Lose 2 Pounds a Week, or 5 Pounds a Week?

Losing 2 lb a week needs a deficit of about 1,000 calories per day, since 1 lb of fat stores about 3,500 calories. Whether that works for you depends on your maintenance level.

A moderately active 200 lb man maintaining at about 2,868 calories can eat about 1,868 and stay above every floor. A moderately active 150 lb woman maintaining at about 2,113 would land at about 1,113, below the general 1,200 floor. For most people, 0.5 to 1 lb per week is the more sustainable pace, and the CDC recommends about 1 to 2 lb per week as a gradual, steady rate.

The same maths shows why an even faster target breaks down.

Losing 5 lb a week needs a deficit of about 2,500 calories per day, which exceeds most adults’ entire maintenance level and is not a realistic or safe target. A moderately active 150 lb woman maintains at about 2,113 calories, so a 2,500 deficit is arithmetically impossible, and very rapid loss also raises the risk of gallstones and muscle loss.

Aim for 1 to 2 lb per week instead, as the CDC recommends, and if you have a deadline, set a smaller goal for that date rather than a faster pace.

How Long Will It Take to Reach Your Goal?

A pace without a date feels abstract, so here is the simple math first, with one important correction after it. At a steady 500-calorie daily deficit, the old 3,500-calorie rule gives these timelines, and the arithmetic is exact: 10 lb takes about 70 days, 20 lb takes about 140 days, and 30 lb takes about 210 days. These are optimistic, because they assume your maintenance never changes, and it does.

The dynamic picture comes from Hall et al. (The Lancet, 2011), who modeled how the body actually responds. In their model, a 100 kg sedentary man cutting 500 calories a day settles at about 75 kg over 10 years, with about half the total loss happening in the first year and about 95 percent within 3 years. The 3,500-calorie rule, by contrast, predicts 22 kg lost in the first year alone. The practical lesson is to expect the first half of your goal sooner and the second half slower, and to recalculate every 4 to 6 weeks as your weight drops. For a personal projection that accounts for this slowing, the NIH Body Weight Planner is the free tool built on this dynamic model: enter your starting weight, goal weight, and activity level, and it shows both the calories to reach your goal and the calories to maintain it afterward.

The Quick Shortcut

If the three-step formula feels like too much work, here is a shortcut that gets you close: multiply your body weight in pounds by 10 to 12. That gives you a moderate-deficit range. For example, a 175 lb person would eat 1,750 to 2,100 calories per day.

Start in the middle of that range if you are unsure, and pick the lower end if you are shorter or less active, or the higher end if you are taller or more active. The shortcut works because body weight is a decent stand-in for maintenance calories. Heavier people burn more calories to maintain their weight, so their target is higher. The shortcut is not as precise as the full formula, but it is close enough to start, and starting matters more than being exact on day one.

Whatever number you start with, give it time. Try it for at least 3 weeks before judging it. Weight can bounce around by 1 to 3 lb day to day because of water, salt, and glycogen, so judge the trend across weeks, not a single day. If the trend is flat after 3 weeks, adjust by about 10 percent and try again. Stick with it, and the answer to how many calories should I eat to lose weight becomes a habit, not a daily guess.

Find Your Number in the Chart

If you do not want to do any math, find your row below. The chart uses the same 3-step formula from this article, worked out for a 35-year-old woman at 5 ft 4 in (163 cm) and a 35-year-old man at 5 ft 10 in (178 cm). “Maintenance” is the amount that holds weight steady. “Target” is maintenance minus a 500-calorie deficit, which aims at about 1 lb per week. If your exact weight, height, or age differs, use our TDEE calculator or calorie calculator for your personal number, and read our guide on what a calorie deficit is if you want the concept behind the numbers.

Women (35 years old, 5 ft 4 in)

Body weight	Sedentary maintenance	Sedentary target	Moderately active maintenance	Moderately active target
130 lb	1,526	1,026 (below the floor, see note)	1,972	1,472
150 lb	1,636	1,136 (below the floor, see note)	2,113	1,613
180 lb	1,799	1,299	2,323	1,823
210 lb	1,962	1,462	2,534	2,034

Men (35 years old, 5 ft 10 in)

Body weight	Sedentary maintenance	Sedentary target	Moderately active maintenance	Moderately active target
160 lb	2,002	1,502	2,585	2,085
200 lb	2,220	1,720	2,868	2,368
240 lb	2,437	1,937	3,148	2,648

Two notes on the chart. First, the two targets marked “below the floor” fall under the general 1,200-calorie floor for women, so do not use them. A smaller deficit or more daily movement is the safer route there, as explained in the floors section above. Second, the chart assumes age 35. Older readers burn somewhat less at the same weight, so check the age table below if you are over 50.

How Many Calories Should a Woman or a Man Eat to Lose Weight?

There is no single number for women, because it depends on size, age, and activity, but the chart in this article gives the range. A moderately active 150 lb woman at age 35 eats about 1,613 calories a day to lose about 1 lb per week, and a sedentary woman of the same weight eats about 1,136, which falls below the general 1,200 floor, so a smaller deficit plus more movement is safer there.

Use the chart above or our TDEE calculator for your personal figure, and check it against your BMR floor.

The same chart logic applies to men, with higher numbers.

Size and activity decide it, but men typically need more than women at the same weight because they carry more muscle. A moderately active 200 lb man at age 35 eats about 2,368 calories a day to lose about 1 lb per week, and a sedentary man of the same weight eats about 1,720. The worked example above walks through a 90 kg man step by step, and the chart above covers 160 lb, 200 lb, and 240 lb at two activity levels.

Why the First Week Drops So Fast, and Why It Slows Down

Many people lose several pounds in week 1 and then slow down sharply. That first drop is mostly water, not fat, and the mechanism is glycogen. Your body stores carbohydrate as glycogen in your liver and muscles, roughly 400 to 500 grams when fully topped up, and each gram of glycogen holds roughly 3 to 4 grams of water with it. That is roughly 1.2 to 2 kg of water riding along with your carbohydrate stores.

When you start eating less, your body taps glycogen before it gets serious about fat, so the bound water leaves with it. A big drop in week 1 therefore says little about your fat loss rate, and a smaller drop in week 2 does not mean the plan stopped working. It means you are now losing mostly fat, which moves at the slower pace in the goal ladder above. The same mechanism works in reverse: a carb-heavy weekend can add several pounds overnight, and almost all of it is water being re-bound to refilled glycogen, not new fat. Judge the plan by the trend over 3 to 4 weeks, not by week 1.

Calorie Needs by Age

Calorie needs fall with age, so a number that worked at 30 may be too high at 55. The table below gives maintenance calories from the Dietary Guidelines for Americans, 2020-2025, for adults at two activity levels. These are population estimates rounded to the nearest 200 calories, so use our TDEE calculator for your personal number, and use this table to sanity-check it. These tables are for adults only: do not put children on a reduced-calorie plan without medical guidance.

Women, maintenance calories per day

Age	Sedentary	Moderately active
19 to 30	1,800 to 2,000	2,000 to 2,200
31 to 50	1,800	2,000
51 and over	1,600	1,800

Men, maintenance calories per day

Age	Sedentary	Moderately active
19 to 30	2,400 to 2,600	2,600 to 2,800
31 to 50	2,200 to 2,400	2,400 to 2,600
51 and over	2,000 to 2,200	2,200 to 2,400

To turn a maintenance figure into a loss target, subtract your chosen deficit, 250 to 750 calories, and check the result against the floors in this article. A 55-year-old sedentary woman maintaining at 1,600 calories, for example, reaches the 1,200 floor with only a 400-calorie deficit, so a smaller deficit plus more daily movement is usually the better plan at that age.

How to Count Calories in Practice

A target is useless without a counting method, and the method is simple once it becomes a habit. The NHS counting method starts with a typical day: write down everything you eat and drink on an ordinary day before you change anything, so you can see exactly where to cut. Then use an app or a food diary to keep a daily record, and read the labels on shop-bought foods, checking both the serving size and the calories per serving, because the manufacturer’s portion may be smaller than yours.

Weigh your portions when you start, and do it before cooking. The NHS gives a clear example: a packet of rice says a 75 g portion is 260 calories, so a 150 g portion is 520 calories. That one habit alone corrects the most common counting error, which is guessing portions. Keep the diary complete by including the calories in alcohol, fizzy drinks, and juices, the oil and spreads you cooked with, and toppings and sauces such as cheese, yogurt, mayonnaise, and ketchup. Log before you eat rather than after, and track weekends with the same rigor as weekdays, because weekend eating is where most weekly totals quietly rise. A food scale helps for the first few weeks, and after that most people can estimate portions they have weighed many times. Remember that labels are not exact: under FDA rules, the calories on a label may legally run up to 20 percent above the printed number, which is another reason to weigh food and watch the weekly trend rather than trusting a single day.

The Floors You Should Not Cross

A deficit is a tool, and like any tool it has a safe range. The first floor is your BMR. Do not eat below your BMR for a long period. Your BMR is the energy cost of staying alive, and eating below it for weeks on end leaves your body short on the energy it needs for basic functions. Short dips are not a crisis, but a target that sits below BMR week after week is a warning sign that the deficit is too steep.

The second floor is a general minimum for daily intake without medical supervision: about 1,200 calories per day for women and 1,500 for men. The WebMD guide to calorie deficit uses a starting range of 1,200 to 1,500 calories per day for women and 1,500 to 1,800 for men as a typical starting point. Most adults losing weight eat around 1,200 to 1,800 calories per day, but individual needs vary with size, age, and activity. If your formula gives you a target below these minimums, that is a sign to pick a smaller deficit, raise your activity, or talk to a clinician rather than pushing lower.

Eating too little backfires in several ways at once. First comes metabolic adaptation: your metabolism slows as your body tries to conserve energy, so the same low intake stops producing loss. Second comes muscle loss. When the deficit is too steep, a larger share of the weight you lose comes from muscle instead of fat, which lowers the number of calories you burn at rest.

Third come fatigue, gnawing hunger, and difficulty concentrating, which make the plan hard to follow. The end result is often a rebound, where hunger and exhaustion push intake back up and the weight returns. A deficit that is too steep makes weight loss harder over time, not easier.

When to See a Doctor Instead of Cutting Lower

Most stalls are tracking, water, or adaptation, but some are medical, and knowing the difference matters. The NHS lists an underactive thyroid as one possible medical contributor to weight gain, and polycystic ovary syndrome is also associated with weight gain through hormonal imbalance and insulin resistance. Some medicines are associated with weight gain too, including certain antidepressants, antipsychotics, and steroids. A history of disordered eating is another reason to get guidance before restricting further, since tracking can make that worse.

See a doctor if a month of accurate tracking shows no downward trend at all, if weight changes rapidly without explanation, or if weight problems come with fatigue, swelling, or hormonal symptoms such as irregular periods. One more bright line: a very low calorie diet, meaning about 800 calories a day or fewer, is a clinical intervention, not a self-directed plan. NHS guidance says such diets should only be followed under medical supervision, for a maximum of 12 weeks, and they are not suitable for people under 18, people who are pregnant or breastfeeding, or people with a history of eating disorders.

Why the Scale Stops Moving

Almost everyone hits a plateau. You eat the same target that worked for weeks, and the scale stops moving. This is normal, and it usually has one of four causes. The first cause is metabolic adaptation. As you lose weight, your body needs fewer calories for maintenance, so your TDEE drops.

A target that was a 500-calorie deficit at your starting weight might only be a 200-calorie deficit after you have lost 8 kg. That is why you should recalculate every 4 to 6 weeks: run the three-step formula again with your new weight, and adjust your target down as your weight drops. The same target stops working because you are a smaller person now, and smaller people burn less.

The second cause is tracking drift. Portions creep up, bites and tastes go unlogged, cooking oil gets eyeballed, and weekend eating goes uncounted. After a few months, those gaps can easily add 200 to 400 calories a day. Tighten tracking for one week, weigh portions again, and check whether your intake has quietly risen.

The third cause is sleep and stress. Poor sleep raises hunger hormones, and stress can drive evening snacking that quietly erases the deficit. Aim for 7 to 9 hours of sleep, and add a daily walk, which helps both appetite and recovery.

The fourth cause is water retention. Starting or intensifying strength training makes muscles hold extra fluid while they repair, and refilling glycogen stores pulls roughly 3 to 4 grams of water along with every gram of glycogen, so the scale can rise for days even while fat is coming off. A salty week or a hormonal cycle can do the same, adding several pounds of water that hide fat loss until they clear. This water is temporary and it is not fat, so compare weekly average weights, waist measurements, and how your clothes fit before deciding the plan has stopped working.

What If I Am Not Losing Weight on My Target?

Give it 3 weeks before changing anything. Weight moves in fits and starts, and a short stall is not proof the target is wrong.

If weight is still stagnant after 3 weeks, cut about 10 percent, or check tracking accuracy, sleep, and stress first. One of those four is usually the reason the scale has stopped, and fixing it beats cutting lower blindly.

Why Am I Not Losing Weight on 1,400 Calories?

Eating 1,400 calories and seeing no loss is frustrating, and it usually has one of four explanations. Work through them in order before you cut lower, because cutting lower is rarely the fix.

First, the 1,400 may not really be 1,400. Studies that compare food records against doubly labeled water measurements, the most accurate way to measure energy use, have found underestimates of roughly a quarter to over a third of intake. In one study of postmenopausal women, a 7-day food record underestimated intake by 37 percent. Labels add to the gap: under FDA rules, the calories on a label may legally run up to 20 percent above the printed number. Cooking oil, sauces, drinks, bites while cooking, and weekend meals are the usual suspects, and they are exactly what a food diary catches.

Second, water can hide fat loss for days at a time. A salty week, a hormonal cycle, or a new strength routine can add several pounds of water that sit on the scale while fat is still coming off. Judge the trend across 2 to 3 weeks, not a single weigh-in, and compare your waist measurement and how your clothes fit alongside the scale.

Third, your maintenance may be lower than the calculator said. The Mifflin-St Jeor equation used in this article is the most reliable formula available, predicting resting metabolic rate within 10 percent of measured values in more people than other equations (Frankenfield et al., 2005). That still leaves room for error: a 2,000-calorie estimate could really be 1,800 to 2,200. Add metabolic adaptation on top, and a target that once worked can quietly become maintenance.

Fourth, a medical cause may be at play. The NHS lists an underactive thyroid as one possible medical contributor to weight gain, and polycystic ovary syndrome and some medicines, including certain antidepressants, antipsychotics, and steroids, are also associated with weight gain. If a month of accurate tracking shows no downward trend at all, that is a legitimate reason to see a doctor, not a reason to eat less on your own.

Why Am I Not Losing Weight on 1,400 Calories? Four Explanations That Cover Most Cases

Four explanations cover most cases. First, the 1,400 may not really be 1,400, because food records commonly underestimate intake by roughly a quarter to over a third, and labels may legally run up to 20 percent above the printed calories.

Second, water from salt, hormones, or new training can hide fat loss for days, so the scale can sit still while fat is still coming off. Third, your maintenance may be lower than the calculator said, since even the best formula carries about 10 percent error.

Fourth, a medical cause such as an underactive thyroid, polycystic ovary syndrome, or a medicine may be involved. Tighten tracking for one week, weigh portions, include weekends, and if a month of accurate tracking shows no downward trend, see a doctor rather than cutting lower.

Is Starvation Mode Real?

No, not in the way the phrase is usually meant. Eating less does not flip a switch that makes your body gain fat, and no controlled evidence supports the idea that a calorie deficit by itself causes weight gain. What does happen is real, but it has different names, and each one has a different fix.

First, metabolic adaptation: as you lose weight, your body burns fewer calories, partly because you are smaller and partly through a small extra slowing beyond what size alone predicts. In the extreme Biggest Loser case, researchers found resting metabolic rate about 500 calories per day lower than expected 6 years after massive loss (Fothergill et al., 2016), but that was an extreme protocol, and typical adaptation on a moderate deficit is much smaller.

Second, hunger rises: fat loss lowers leptin, the hormone that signals fullness, so appetite climbs and food thoughts get louder.

Third, unconscious movement drops: you fidget less, sit more, and take fewer spontaneous steps, which quietly shrinks NEAT, the everyday movement covered above.

Fourth, tracking error grows, as covered in the troubleshooting section. None of these is a broken metabolism, and none of them turns a deficit into fat gain. They are the reasons the scale stalls, and the fixes are recalculation, tight tracking, sleep, strength training, and patience, not eating more in the hope of shocking the system.

Split Your Deficit Between Food and Movement

You do not have to cut the whole deficit from food. One workable split is about 250 calories from the plate and about 250 from movement. Diet is the more efficient lever, because it is easier to skip 250 calories than to burn them, but movement protects muscle and predicts keeping weight off, and it gives you a second lever on days when food cuts feel tight. If you use our calorie deficit calculator, the split is already built into the target, so treat the split as a way to reach the number, not as an extra cut on top of it.

Can you lose weight by exercising alone, without eating less? In theory yes, in practice it is a hard road, and the numbers explain why. A large analysis of 1,754 adults found that energy compensation averages 28 percent, meaning only about 72 percent of extra activity calories translate into extra daily burn, because the body quietly spends less elsewhere and appetite rises. A genuine 500-calorie session is also a big session: for a 155 lb person, that is roughly an hour of cycling at 12 mph (about 560 calories) or 5 miles of running at 6 mph (about 570 calories), using standard MET values from the Compendium of Physical Activities. That is why exercise-only plans so often disappoint, and why the combination of a moderate food cut plus regular movement beats either lever alone. One more caution: do not eat back tracker calories on top of a TDEE-based target, because the activity multiplier already accounts for your usual exercise. Treat tracker numbers as estimates, not exact burns.

NEAT: The Movement You Do Not Count as Exercise

NEAT stands for non-exercise activity thermogenesis, which is the energy you burn through everything that is not sleeping, eating, or formal exercise: standing, walking to another room, fidgeting, taking the stairs, and doing housework. It is a larger lever than most people realize. Research by James Levine at Mayo Clinic found that lean people sat about 2.5 fewer hours per day than people with obesity, despite similar exercise habits, and that difference was worth roughly 350 extra calories burned per day through everyday movement alone. Harvard Health notes that NEAT can vary by up to 2,000 calories a day between people of similar size, which makes it one of the biggest hidden differences between two people with the same workout routine.

You can raise NEAT without adding gym time. Take the stairs, stand while on phone calls, walk down the hall instead of sending a message, pace while waiting, and break up long sitting periods with short walks. None of these replace strength training or the deficit itself, but together they add a meaningful daily burn, and they explain why two people on the same calorie target can lose at different rates. If your job keeps you seated all day, NEAT is the first place to look when progress is slower than the formula predicts.

How to Make the Deficit Easier

The math tells you how much to eat. The next question is how to eat that much without feeling hungry all day. Four habits make the biggest difference. First, eat enough protein. Protein is the most filling of the three macronutrients, and it helps preserve muscle while you lose fat. A good starting point is to build each meal around a protein source, such as eggs, chicken, fish, beans, lentils, or Greek yogurt. If you want a personal protein target, use our macro calculator to split your calories into protein, carbs, and fat.

Second, lift weights. Strength training 2 to 3 times per week, combined with enough protein, keeps most of the loss coming from fat instead of muscle. Muscle is metabolically active, so keeping it protects your TDEE as you lose weight. You do not need a complicated program. Two or three full-body sessions a week, covering the major movement patterns, is enough to make a real difference.

Third, choose food quality, not just calories. Calorie counting controls energy intake, but nutrient-dense whole foods improve satiety and health. Vegetables, fruit, whole grains, legumes, and lean proteins fill you up for fewer calories than ultra-processed foods, because they carry more water, fiber, and volume. Combining mindful calorie control with healthy eating is the most effective approach.

One place this shows up clearly is belly fat: you cannot target fat loss from one spot, but a steady deficit plus strength training and good sleep reduces overall body fat, including around the waist. See our belly fat plan for the specifics.

Fourth, track without obsession. Tracking is a tool for learning portions and spotting drift, not a life sentence. Most people do well tracking 3 to 4 days a week, or tracking until portions become automatic. If tracking starts to feel obsessive or stressful, step back to habit-based eating: protein at each meal, vegetables on half the plate, and the hunger scale. Revisit your number every few weeks, and the answer to how many calories should I eat to lose weight stays matched to your current body.

Does Food Quality Matter, or Only Calories?

Calories decide weight loss, and that part does not change. Quality decides hunger, health, and whether you can stick with it.

A target built only on low-quality foods is harder to hold, even when the maths is right, because hunger and energy suffer. Get the calories right first, then let food quality carry the plan.

A Protein Target in Grams

“Eat more protein” is vague advice, so here is a number to check yourself against. During weight loss, a commonly used target is 1.2 to 1.6 grams of protein per kilogram of body weight per day, which supports muscle preservation while you lose fat. For a 70 kg person, that is about 84 to 112 grams per day. For a 91 kg (200 lb) person, it is about 110 to 145 grams per day. Spread it across meals, aiming for a protein source at each one, and use our macro calculator to split your calories into protein, carbs, and fat if you want the full breakdown.

Two cautions apply. If you carry much extra weight, calculating from your current weight can give an impractically high target, so clinicians sometimes calculate from a goal weight instead. And if you have kidney disease or another condition that affects protein handling, discuss your target with a clinician before raising protein, since higher protein is not right for everyone.

How to Split Your Calories Across Meals

Once you have a daily number, the next question is how to split it. One workable split is about 25 to 30 percent at breakfast, 30 to 35 percent at lunch, 30 to 35 percent at dinner, and the rest as a snack. At 1,500 calories, that is roughly 375 to 450 at breakfast, 450 to 525 at lunch, 450 to 525 at dinner, and the remainder as a snack. This is a starting pattern, not a rule, and shifting it to fit your schedule is fine.

Two habits make the split work better. First, put protein at every meal, not just dinner, so each meal helps with fullness and muscle preservation. Second, front-load toward morning and afternoon rather than undereating all day and compensating at night, because a large late meal is where most people overshoot without noticing. If mornings are rushed, a simple protein-rich breakfast, such as Greek yogurt with oats and fruit, covers the first slot without cooking.

How Many Calories Should I Eat for Breakfast?

A workable pattern is about 25 to 30 percent of your daily total at breakfast, which is roughly 375 to 450 calories on a 1,500-calorie day.

Put protein in it, such as eggs or Greek yogurt, since protein at breakfast helps with fullness through the morning and protects muscle while you lose fat. Shifting the split to fit your schedule is fine, but skipping breakfast and then overeating at night is the pattern to avoid.

A Sample Day at About 1,500 Calories

Here is how a 1,500-calorie target turns into food, with protein at every meal and a total of about 120 grams of protein. Values are approximate, and swapping any item for something similar in calories keeps the day on track.

Breakfast, about 400 calories: 2 eggs (about 140), 2 slices of whole wheat toast (about 160), and 1 medium banana (about 100). Protein: about 21 grams.

Lunch, about 450 calories: chicken breast, about 120 grams cooked (about 200), 1 cup of cooked rice (about 200), and mixed vegetables (about 50). Protein: about 43 grams.

Snack, about 150 calories: nonfat Greek yogurt, about 170 grams (about 100), with a handful of berries (about 50). Protein: about 18 grams.

Dinner, about 500 calories: salmon, about 150 grams (about 300), 1 medium sweet potato (about 130), and a green salad with 1 teaspoon of olive oil (about 70). Protein: about 37 grams.

That day totals about 1,500 calories and about 119 grams of protein, which sits inside the 1.2 to 1.6 grams per kilogram range for a person weighing about 75 to 90 kg. If your target is higher, add a second snack or larger portions of the same foods rather than adding a new meal type.

Food Swaps That Save Real Calories

General advice to “eat better” rarely changes a day, but specific swaps do, because each one has a number attached. Cutting a portion by about a fifth saves a fifth of its calories, so a 1,000-calorie restaurant meal becomes about 800 calories, which is 200 saved without changing what you ordered. Cooking oil is another quiet source: 1 tablespoon carries about 120 calories, so measuring oil instead of pouring it freely can save a full snack’s worth of calories across a day of cooking.

Liquid calories deserve special attention because they add energy without filling you up. A single 12 oz can of cola carries about 140 calories with no protein, fiber, or fullness to show for it, and juice, alcohol, and high-calorie coffees behave the same way. Swapping one daily sugary drink for water or unsweetened tea removes about 140 calories a day, which is nearly 1,000 calories a week, without touching your meals.

Sugary drinks and refined carbs are the top cuts for exactly this reason: they are calories that never satisfy hunger, so removing them rarely feels like a sacrifice.

Losing Weight Without Counting Calories

If counting feels miserable, you can still lose weight without it, by building meals that naturally land lower in calories. The Harvard Healthy Eating Plate is the simplest framework: fill about half the plate with vegetables and fruits, a quarter with whole grains, and a quarter with healthy protein such as fish, poultry, beans, or nuts, with water as the default drink. That single rule, applied to most meals, removes the need for arithmetic while keeping portions in check.

Three more no-counting tools work alongside the plate. First, eat protein first at each meal, since protein is the most filling macronutrient and it protects muscle while you lose fat. Second, focus on food quality: whole foods carry more water, fiber, and volume than ultra-processed foods, so they fill you up for fewer calories, which is why a plate of vegetables, beans, and rice satisfies longer than the same calories from snacks. Third, some people find a set daily eating window helpful, for example eating within an 8 to 10 hour window and fasting the rest of the day, which cuts late-night snacking without any counting. If tracking ever starts to feel obsessive or stressful, stepping back to these habits is a sensible move, not a failure, and the article’s tracking section above says the same.

After the Goal: Keeping the Weight Off

Reaching your goal is only half the job, and rebound is the outcome readers fear most, so plan the maintenance phase before you arrive there. The National Weight Control Registry, which tracks more than 10,000 people who lost significant weight and kept it off, found a consistent pattern: members reported exercising about 1 hour per day on average, about 75 percent weighed themselves at least once a week, and most kept eating a low-calorie pattern with breakfast as a regular habit. Activity is one of the strongest predictors of keeping weight off once lost, which is why the exercise habit matters even more after the diet ends.

A practical maintenance plan has four parts. First, step your calories up gradually to your new maintenance level instead of jumping straight back to old eating habits, and use the NIH Body Weight Planner to find that number. Second, keep strength training 2 to 3 times per week with enough protein, since muscle is what protects your maintenance level. Third, keep weighing yourself weekly, so a small regain is caught early while it is easy to correct. Fourth, keep the plate habits from this article, because the same meals that produced the loss are the ones that maintain it. If weight creeps up for several weeks, return to a small deficit for a few weeks rather than waiting for a large regain.

Sources

• Centers for Disease Control and Prevention, “Steps for Losing Weight”: gradual, steady loss of about 1 to 2 lb per week is more likely to be kept off than faster loss. CDC
• National Health Service, “Calories and weight loss”: aim to reduce intake by around 600 calories a day, plus the counting method used in this article (typical day first, labels, weighing portions, food diary). NHS
• National Institute of Diabetes and Digestive and Kidney Diseases, Body Weight Planner: a validated dynamic model that predicts how weight responds to diet and activity changes over time.
• National Academies of Sciences, Engineering, and Medicine, “Dietary Reference Intakes for Energy” (2023): updated energy requirement equations based on expanded doubly labeled water data. National Academies
• Hall et al., “Quantification of the effect of energy imbalance on bodyweight”, The Lancet, 2011: body weight responds slowly to an intake change, with half-times of about 1 year. PubMed
• Fothergill et al., “Persistent metabolic adaptation 6 years after ‘The Biggest Loser’ competition”, Obesity, 2016: resting metabolic rate about 500 calories per day lower than expected 6 years after extreme loss.
• Frankenfield et al., “Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults: a systematic review”, Journal of the American Dietetic Association, 2005: the Mifflin-St Jeor equation predicted resting metabolic rate within 10 percent of measured values in more people than other equations. PubMed
• Careau et al., “Energy compensation and adiposity in humans”, Current Biology, 2021: energy compensation averaged 28 percent across 1,754 adults, so only about 72 percent of extra activity calories translated into extra daily burn. PMC
• Mahabir et al., “Calorie intake misreporting by diet record and food frequency questionnaire compared to doubly labeled water among postmenopausal women”, European Journal of Clinical Nutrition, 2006: food records underestimated intake by 37 percent and questionnaires by 42 percent. PubMed
• Levine and Harvard Health, “Use the NEAT factor (nonexercise activity thermogenesis) to burn calories”: lean people sat about 2.5 fewer hours per day than people with obesity, and NEAT can vary by up to 2,000 calories a day between people of similar size. Harvard Health
• Harvard T.H. Chan School of Public Health, Healthy Eating Plate: about half vegetables and fruits, a quarter whole grains, a quarter healthy protein.
• U.S. Food and Drug Administration, 21 CFR 101.9(g)(5): calories on a label may not exceed the declared value by more than 20 percent. FDA guidance
• Dietary Guidelines for Americans, 2020-2025, Appendix 2: estimated calorie needs by age, sex, and activity level, used for the age table in this article.
• National Weight Control Registry: members who kept weight off reported exercising about 1 hour per day on average, and about 75 percent weighed themselves at least once a week.

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