Refeed Day vs Diet Break: What Each One Is, What the Research Shows, and When to Use Them

Refeeds and diet breaks are two of the most used, and most argued about, tools in dieting. Some coaches put them in every prep; others never use them. The research is thinner than either side suggests, but it is enough to make better decisions than habit does.

Refeed day vs diet break: the difference

A refeed is not a cheat day. It is planned, tracked, and built mostly from carbohydrate, with protein unchanged and fat kept moderate. A diet break is not a week off tracking either. The athlete eats at maintenance, on purpose, and goes back to the deficit on a set date.

What the research says about refeeds

The most direct study is a 2020 randomized trial in 27 resistance-trained adults (Campbell et al., 2020). Both groups dieted at about a 25% calorie deficit for seven weeks and trained four days a week. One group dieted continuously; the other added a two-day carbohydrate refeed every week.

• Both groups lost similar amounts of body mass and fat.
• The refeed group kept fat-free mass and resting metabolic rate better, according to the authors.

That finding was challenged in a published comment, which argued that on reanalysis only dry fat-free mass differed between groups, and the authors replied (comment and reply). The fair reading: refeeds didn't hurt fat loss, and they may help keep muscle, but one small study is not proof.

What the research says about diet breaks

In resistance-trained adults

The ICECAP trial put resistance-trained adults on a 12-week diet, either continuous or broken into blocks of three weeks of dieting with a one-week break at maintenance between them (Peos et al., 2021). The result: "similar fat loss and fat-free mass retention" in both groups, but the diet break group reported lower hunger and desire to eat.

A secondary analysis of the break weeks found small gains in body weight and fat-free mass with no significant change in fat mass, and participants reported less hunger and irritability (Peos et al., 2021).

In men with obesity

The MATADOR study, in men with obesity, alternated blocks of dieting with blocks at maintenance and found greater weight and fat loss than continuous dieting (Byrne et al., 2018). That is a different population from a lean athlete in prep, so don't expect the same result on stage.

How a coach decides

Consider a refeed when

• Training performance is dropping and the athlete is already fairly lean.
• The athlete looks flat in photos and feels drained before training.
• The weekly rate of loss is on target, so there is room for a higher day.

Consider a diet break when

• The diet has run for many weeks and adherence is slipping.
• Hunger, mood or sleep reported at check-ins are getting worse.
• There is time in the schedule: a break adds its length to the prep.

Use neither when

• The athlete is behind schedule for a show and can't afford the time.
• A refeed would become a binge. Some athletes do better with steady intake.
• The real problem is a deficit that is too big. Fix the deficit first.

How to run each one

A refeed

• Raise calories to about maintenance, mostly from carbohydrate.
• Keep protein the same and fat moderate.
• Put it on or before the hardest training day.
• Expect the scale to rise the next morning from water and food. Judge it by the weekly average.

A diet break

• Set calories at the athlete's maintenance, based on their tracked data.
• Keep training as normal and keep tracking.
• Set the end date before the break starts.
• Expect some weight back from glycogen and water, and tell the athlete in advance.

Not sure what maintenance is? Our macro guide shows how to estimate it, and the contest prep diet guide covers adjusting a deficit.

Planning refeeds in the meal plan

A refeed only works when the athlete knows exactly what to eat that day. CoachPilot meal plans are multi-day, with macros totaled for each day, so the refeed can be its own day in the client's meal plan. You see the effect on the next check-in. The reason for the change sits in your conversation with them.

The short version

A refeed is a day or two at maintenance from extra carbs; a diet break is a week or more at maintenance. Studies in lifters suggest neither hurts fat loss, refeeds may help keep muscle, and diet breaks make dieting easier to stick to. Use them when check-ins show a reason, not because the calendar says so.

Frequently asked questions

Keep comparing: see the full CoachPilot pricing and comparison table, the contest prep diet guide, how to calculate macros and reverse dieting after a show.