Diet breaks: do they help you lose more fat?

A diet break is a planned return to maintenance calories, then back to the deficit. One study made that look powerful. Later work did not. The useful part is still real, and it is mostly in your head.

Short answer: In that study, the group who took two-week breaks at maintenance lost almost twice the fat over the period, kept more muscle, and regained much less fat after the diet. Studies from 2021 found no such advantage over steady fat loss. A break still earns its place, mostly because you can keep going.

What the study compared

Two groups, as these trials usually go.

• Group 1: 16 weeks of dieting, eating 67% of their usual kcal (calories).
• Group 2: also 16 weeks of dieting, but after every two-week diet block they inserted 2 weeks at maintenance calories. Maintenance moves during a diet, of course. The whole thing lasted 30 weeks.

Group 2 lost almost twice the fat over that period, kept more muscle, and regained much less fat after the diet.

A few points that sit next to that result.

• Both groups regained some fat after the diet. Group 2 did clearly better. Gaining some fat back is normal.
• Group 2 lost fat at a much better pace inside the diet blocks. Because of the maintenance blocks, their average fat loss per week was lower than group 1.
• If you know your current maintenance and you return to it during the diet, you do not put fat back on. You only pause the loss. In that study, the step still helped metabolism and energy expenditure.
• Careful: maintenance falls as your weight falls. If you held your weight on 2,000 kcal at the start, a few weeks later that number is lower.
• If you want to lose faster and you can live with the downsides, you do not have to change anything. This slower path is not automatically the best one. It has upsides of its own.

The pace that most people can live with, breaks or not, is in how fast should you lose weight. What maintenance actually is, in kcal, is in calorie deficit: how much to eat.

What 2021 changed

In 2021 more studies came out. They did not find an advantage for diet breaks over steady fat loss, unlike the study above. The breaks still have a use.

A hard week. A party. A stretch where you need a rest and you do not want to gain. When someone is losing something like 50 kg, it is not a job of a few weeks, and at some point the diet gets broken anyway. The break arrives on its own. How a rough week still produces a deficit is in meal planning for fat loss.

Often it is more sustainable to stop aiming at fat loss for a while. Mostly for psychological reasons, and so the method and the routine last. Fat loss is habit building. Those habits are what hold the result, and what keeps the weight from bouncing back. That bounce is in yo-yo dieting.

I read the original study as one more sign that a long change of shape should not be a sprint. You do not have to lose weight every single week. The job is not to drop 5 kg for a deadline. It is to get into decent shape and then keep it.

Frequently asked questions

How did the diet-break study run?

Group 1 dieted for 16 weeks at 67% of their usual intake. Group 2 also dieted for 16 weeks, but after every two-week block they took 2 weeks at maintenance, so the whole diet lasted 30 weeks. Because of those maintenance blocks, group 2's average fat loss per week was lower than group 1's.

Will I gain fat on a diet break?

If you know your current maintenance and you eat that, you do not put fat back on. You only pause the loss. Maintenance itself drops as your weight drops.

When is a break worth it?

A hard week, a party, or a rest, when you do not want to gain. Stopping the push now and then is often what makes the method last, mostly for your head.

Sources, so you can check:

1) The study described in the source article, with no author, year, journal or DOI printed: one group dieted 16 weeks at 67% of usual kcal; the other dieted 16 weeks with a 2-week maintenance block after each 2-week diet block, 30 weeks in total. The break group lost almost twice the fat over that period, kept more muscle and regained much less fat afterward.

2) Further studies from 2021, as named in the source article, found no advantage of diet breaks over continuous fat loss. No author, journal or DOI printed.

Martin Barna

Online nutrition and fitness coach. Since 2013 I have helped 600+ people lose fat and keep the result. Science, not crash diets.

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This article is for information only. It is not medical advice. If you have a health condition, talk to your doctor.