Refeed Day
Refeed Day — A refeed day is a planned, single-day or two-day increase in calorie intake — primarily from carbohydrate — built into an extended calorie deficit to replenish muscle glycogen, normalize leptin signaling, and improve psychological adherence. Refeeds are most commonly used in physique sport, athletic training during cuts, and structured weight-loss protocols.
What is a refeed day?
A refeed day is a deliberate, scheduled increase in calorie intake during an otherwise sustained calorie deficit. A typical refeed:
- Raises calories to maintenance (TDEE) for one or two days
- Increases come predominantly from carbohydrate (rather than fat or protein)
- Frequency: every 7-14 days during a long cut
A refeed is distinct from a “diet break” (a longer planned period — typically 1-2 weeks — at maintenance calories) and from a “cheat day” (an unstructured eating event without specific macronutrient targets).
How does a refeed work?
Mechanistically, several adaptations to chronic energy deficit are at least partially reversed by refeeds:
- Leptin — falls during deficit; rises with carbohydrate intake within 12-24 hours
- Thyroid hormone (T3) — modestly normalizes with carbohydrate
- Muscle glycogen — replenished, supporting next-cycle training intensity
- Subjective hunger and adherence — often substantially improved post-refeed
The strongest empirical case for refeeds is in physique competition prep, where chronic deficits last 12-20 weeks and the cumulative metabolic adaptation is substantial. Trexler et al., 2014, in JISSN reviews adaptive thermogenesis and the rationale for periodic refeeds.
Why refeeds matter
For most consumer dieters losing 10-20 lb, refeeds are not strictly necessary — adherence to a moderate deficit usually suffices. Refeeds become more useful when:
- The deficit has lasted 8+ weeks
- The dieter is approaching a low body-fat percentage (men <12%, women <20%)
- Training performance is declining
- Adherence is faltering due to hunger or food preoccupation
Refeeds are not a license to overshoot maintenance — calories should be planned, not unstructured. A refeed eaten as 200% of TDEE simply reverses prior loss. App-based tracking (especially with apps that allow per-day macro variation) makes structured refeeds easier to execute. See carb cycling, TDEE, and intermittent fasting.