Reverse diet

What reverse dieting does, and what it does not

It is a structured transition: instead of going from a diet back to normal eating overnight, you add calories in small weekly steps until you reach maintenance. That is the whole of it, and as scheduling it is sensible — it gives you weeks of feedback, and it makes the climb deliberate rather than accidental.

What it does not do is repair or boost your metabolism. That claim is everywhere on pages about this, and the direct evidence for it is thin. The honest summary is that there is very little evidence reverse dieting prevents regain compared with simply returning to maintenance sensibly. The support is indirect, from the adaptive thermogenesis literature, where the measured slowdown is modest and largely reverses on its own as you eat more.

So: worth doing if a gradual climb suits you. Not worth doing because someone promised it would fix something.

Why your maintenance is a moving target

Here is the problem with every reverse diet calculator that estimates maintenance from an equation: the equation is least reliable exactly where you are standing. You have just lost weight, you are lighter than the equation's sample assumes for your height, and you may be carrying some adaptive slowdown on top.

Worse, the usual tools assume your weight stays flat through the ramp. It will not. For most of the climb you are still eating below maintenance, so you keep losing a little — and as you lose, maintenance falls further. Then, as intake catches up and weight settles, maintenance starts rising again.

This page models that. Each week it recomputes your resting rate from the weight you are projected to be at, so the target moves as you approach it, and the ramp ends when your intake actually meets your maintenance rather than when it hits a figure calculated on day one.

Use your own data instead

If you tracked your intake through the last few weeks of your diet, you can back-calculate what your maintenance really was, and it beats any equation:

maintenance = average intake + (weight change in kg × 7,700) ÷ days

Lose 1.5 kg over 28 days while averaging 1,600 kcal and your real maintenance was about 2,013 kcal. That figure is measured from your own body rather than inferred from a population, and switching the toggle above to use it is the single biggest accuracy improvement available on this page.

How much to add, and how long it takes

Fifty to 150 calories a week is the usual range, with 100 a reasonable default. A 500 calorie gap at 100 a week is five weeks; cautious at 50 a week it is ten. There is no evidence for a specific optimal step size, so pick the one whose pace you can actually read the scale against.

Reading the scale in the first fortnight

Expect the number to jump, and expect it not to mean what it looks like. Eating more carbohydrate restores muscle glycogen, and glycogen holds roughly three grams of water per gram. A kilogram or two appearing in the first two weeks is that, not fat, and panicking at it is the most common way a reverse diet gets abandoned in week three.

When this is not the right tool

Coming off a long or very aggressive deficit, or a very low intake, warrants dietetic supervision rather than a calculator. If you are recovering from an eating disorder, a self-managed calorie ramp is not appropriate — in the UK, Beat's helpline is 0808 801 0677. After bariatric surgery or on a GLP-1 medication your curve will not follow this one, and your clinical team's plan replaces it. Themaintenance calculator is the simpler tool if you just want the destination.