Eating three meals a day doesn't automatically make you healthier or leaner — your body can keep building muscle even if you don't eat all day.
Evidence from Studies
Supporting (2)
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Even without eating right after a light workout, older men’s muscles still kept building protein — so meals aren’t needed right away to trigger muscle growth.
Even without eating more protein right after working out, muscles keep building for hours — so you don’t need to snack constantly to keep gaining muscle.
Contradicting (3)
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Early Time-Restricted Feeding Reduces Appetite and Increases Fat Oxidation but Does Not Affect Energy Expenditure in Humans
This study looked at when people eat and how it affects hunger and fat burning, but it didn’t check if muscles keep building after exercise without eating often, so it doesn’t tell us anything about the claim.
Eating protein every few hours after working out helps your body keep more muscle — eating just once isn’t enough for the best results.
If you only eat protein once after a workout, your muscles don’t grow as well — you need to eat protein a few times to get the most benefit.