Maintenance Calories After Weight Loss

Key takeaways

1. Your new maintenance usually sits between your old maintenance and your diet intake.
2. In the Mifflin-St Jeor equation, each kilogram lost lowers resting energy by about 10 kcal.
3. Raise intake in planned steps and judge the result by weekly averages over two to four weeks.
4. A small scale rise in the first week or two of maintenance is usually water and glycogen, not fat.
5. The habits that helped you lose weight, such as weighing in, logging and walking, also help you keep it off.

What are maintenance calories after weight loss?

Your maintenance calories are the amount of energy that keeps your weight roughly stable: your total daily energy expenditure, or TDEE. If the idea is new, start with what your TDEE means. The key point for this article is simple: maintenance is not a fixed number you carry for life. It depends on your body weight, so after you lose weight your maintenance level is lower than it was when you started.

That creates a three-number situation that confuses many people at the end of a diet:

• Your old maintenance, what you could eat at your starting weight without gaining.
• Your diet intake, what you ate to lose weight.
• Your new maintenance, which almost always sits between the two.

Going back to the first number is the most common reason weight creeps back. Staying on the second forever is unnecessary and hard to live with. The goal is to find the third.

How much lower is your new maintenance?

The Mifflin-St Jeor equation, which most calorie calculators use, has body weight built in: every kilogram lost lowers estimated resting energy by 10 kcal, and the activity factor multiplies that difference. Two worked examples:

For the woman, resting energy falls from about 1,450 to about 1,330 kcal. Her new maintenance is roughly 165 kcal below her old one, but about 330 kcal above what she ate while dieting. The man's numbers follow the same pattern: about 185 kcal below his old maintenance and about 340 kcal above his diet intake.

So the end of a diet usually means you can eat a bit more than you did while losing, just not as much as before you started. You can run your own before-and-after numbers here:

Why is the formula only a starting point?

Every calculator gives an estimate, not a measurement. Two people with the same age, height and weight can differ by a few hundred calories a day, and the activity factor you choose is a judgment call. After weight loss there is extra uncertainty: your body composition, daily movement and appetite may all have changed. Tools such as the NIH Body Weight Planner model these changes over time, which is why their projections curve rather than follow a straight line.

Treat the calculated number as a first guess and let your own weekly data correct it.

How do you move from a deficit to maintenance?

1. Recalculate at your current weight. Use your real activity level, not the one you hope for. If you sit most of the day, "lightly active" is often more accurate than "moderately active".
2. Add calories in a planned way. Some people add the full difference at once; others prefer to raise intake in steps of about 100–200 kcal a week. Steps make it easier to see what each change does.
3. Put the extra calories where they help. A larger portion of vegetables and a protein source, a piece of fruit or a fuller breakfast tends to feel better than spending the whole increase on snacks.
4. Watch your weekly average for two to four weeks. Weigh yourself under the same conditions several times a week and compare averages, not single days.
5. Adjust by small amounts. If the average keeps falling, add about 100–200 kcal. If it rises steadily for several weeks, take about the same amount away.

Why does the scale go up a little at first?

When you eat a little more, especially more carbohydrate, your body refills its glycogen stores, and glycogen is stored with water. A small jump in the first week or two of maintenance is usually water, not fat, and it often levels off on its own. It helps to know this in advance so that one higher weigh-in does not push you straight back into a diet. Read more in water weight vs fat loss.

It is also normal for maintenance to be a range rather than a single number. A weekly average that stays within about one kilogram over several weeks is a stable weight.

Why is regain so common after a diet?

As you lose weight, your energy needs fall and your appetite tends to push back. That combination is the main reason weight loss slows and often reverses once the structure of a diet ends; our article on weight loss plateaus explains the research behind it. It is physiology, not a lack of willpower.

The practical lesson is that the habits which helped you lose weight are also the ones that help you keep it off. Health agencies such as the CDC describe weight management as an ongoing lifestyle, built on regular eating patterns, physical activity and keeping an eye on your weight, rather than a diet with an end date.

What does a maintenance day look like?

Here is one example of a day close to the woman's new maintenance of about 1,830 kcal, using Sporty's per-serving estimates (real values depend on the recipe and portion):

That is a normal-looking day with a lahmacun at lunch, not a diet plate. The protein, about 1.6 g per kg of body weight for her, sits inside the 1.4–2.0 g/kg range suggested for people who exercise and well above the general adult RDA of 0.8 g/kg. Protein and fibre-rich foods help many people feel full on a stable intake; see how much protein you need per day.

What habits help keep the weight off?

• Keep weighing in, less intensely. A few weigh-ins a week and a look at the monthly trend are enough to catch a slow drift early.
• Keep logging something. You may not need to track every meal forever, but logging a few typical days a month keeps your sense of portions honest. Sporty makes this quick with photo logging.
• Protect your daily movement. Walking and everyday activity are part of your maintenance number. If they drop, so does the amount you can eat.
• Plan for weekends and holidays. Maintenance is a weekly average, so bigger days are fine when the rest of the week balances them.
• Set a return point. Decide in advance that if your weekly average rises by about 2 kg, you will return to a modest deficit for a few weeks.

When should you get professional help?

If you find it hard to eat more after a long diet, feel anxious about every gram on the scale, or notice cycles of strict restriction and loss of control, talk to a doctor or a registered dietitian. The same applies if you are pregnant or breastfeeding, under 18, or have a medical condition such as kidney disease. If your weight keeps dropping even after you have increased your intake, check in with a doctor too. This article is general information, not medical advice.

Frequently asked questions

Can I go back to eating what I ate before my diet?

Usually not quite. Your pre-diet intake matched a heavier body, so returning to it tends to bring weight back. Your new maintenance is typically somewhat lower.

How fast should I increase calories after a diet?

Either add the calculated difference at once or raise intake in steps of about 100–200 kcal a week. Then watch your weekly average for two to four weeks and adjust.

Why did I gain weight in my first week of maintenance?

Eating more carbohydrate refills glycogen, which is stored with water. A small early rise is usually water and often levels off within a couple of weeks.

How do I know I've found my maintenance calories?

When your weekly average weight stays within about one kilogram for several weeks while you eat a steady amount, that amount is your real maintenance.

Sources

• Mifflin et al. 1990, A new predictive equation for resting energy expenditure
• NIH NIDDK, Body Weight Planner
• CDC, Losing weight
• ISSN position stand: protein and exercise (Jäger et al. 2017)

This article is general information, not medical advice. If you have a health condition, are pregnant or under 18, talk to a doctor or registered dietitian before changing your diet.