A refeed is most commonly a single day of eating at maintenance or slight surplus, with the additional calories coming primarily from carbohydrates. Unlike a "cheat day" of unrestricted eating, a refeed is structured: protein stays the same as deficit days, fat may stay similar or drop slightly, and carbs absorb most of the additional calories.
Why refeeds work:
- Glycogen restoration: a sustained deficit depletes glycogen partially. A high-carb day refills the storage, supporting better training performance for the following 1-3 days.
- Leptin elevation: chronic restriction lowers leptin, which contributes to hunger and reduced metabolic rate. A high-carb day briefly raises leptin (the effect is short-lived, typically 24-72 hours).
- Psychological relief: a planned high-carb day inside an otherwise restricted plan is easier to look forward to than uncertainty about next "off-plan" meal.
- Sodium and water rebalance: deficit days often run low on sodium and carbs; a refeed temporarily increases both, which can ease the tight or flat feeling that comes mid-deficit.
When refeeds are useful:
- Long fat-loss blocks (8+ weeks of continuous deficit). Weekly or bi-weekly refeeds extend adherence runway.
- Hard training weeks during a deficit. Glycogen restoration before a heavy session can preserve performance.
- Plateaued progress that may be partly leptin-driven. A refeed will not break a true plateau (those are usually log-accuracy issues), but it can rebalance the system before a renewed effort.
When refeeds are unnecessary:
- Short deficits (under 6 weeks). The metabolic adaptation is too small to need rebalancing.
- Mild deficits (under 300 kcal/day). The body adapts gradually rather than acutely.
- Maintenance phases. Refeeds are a deficit-management tool, not a maintenance tool.
Practical execution:
- Calories: maintenance or slight surplus (+100-300 kcal vs maintenance).
- Protein: same target as deficit days (1.6-2.2 g/kg).
- Carbs: take most of the calorie increase; aim for 1.5-3 g/kg of body weight, primarily from whole-food sources.
- Fat: same or slightly lower than deficit days.
- Frequency: weekly or bi-weekly during long cuts.
Refeed vs diet break: a refeed is a single day; a diet break is 1-2 weeks at maintenance. Both can fit into the same overall fat-loss block.