You still need protein on rest days

Muscle repair continues after training ends, so cutting protein on rest days can undermine recovery.

A rest day is not a day when your muscles stop adapting. Resistance training can keep muscle protein synthesis elevated for roughly 24 to 48 hours, depending on training status and the workout. During that period, muscle tissue is still repairing damage, remodeling proteins and building the structures needed to handle future training.

Protein needs are driven more by recovery and adaptation than by whether you lifted that calendar day. Your body does not store a dedicated reserve of dietary protein for tomorrow's repairs, so sharply reducing intake between workouts can leave fewer amino acids available when remodeling is still active. Calories and carbohydrates may vary with activity, but protein intake generally benefits from staying consistent.

Aim for a similar daily protein target across both training and rest days, commonly around 1.6 grams per kilogram of body weight for muscle growth, with individual needs varying. Spread it across several meals and treat rest-day protein as part of the previous workout's recovery, not fuel for a workout you skipped.

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