Post-Workout Nutrition Calculator

The importance of eating immediately after training depends on whether you trained fasted. If fasted (no food for 4+ hours before training), eat within 30-60 minutes to stop muscle protein breakdown (catabolism). If you ate a protein-containing meal within 2-3 hours before training, the immediate urgency drops — you have up to 2 hours post-workout. Total daily protein (1.6-2.2g/kg) matters most for muscle growth.

The optimal single dose to maximally stimulate MPS (Muscle Protein Synthesis) is 0.4g per kg of bodyweight per meal. For a 70kg person, that is 28g of protein. Spreading 4 protein meals throughout the day (every 3-4 hours) each at this dose optimizes muscle protein synthesis better than eating most protein in one or two meals. Whey protein is absorbed fastest post-workout; casein is slower and better before sleep.

Carbohydrates after training serve primarily to replenish muscle glycogen — especially important after endurance exercise or HIIT. For bodybuilding/hypertrophy goals, fast-digesting carbs (white rice, banana, sports drinks) with protein help spike insulin slightly, which further stimulates MPS and reduces muscle breakdown. For fat loss goals, lower carbs post-workout can be maintained without sacrificing muscle if protein intake is adequate.

The classical "30-minute anabolic window" was largely overstated. The scientific consensus now: MPS (Muscle Protein Synthesis) remains elevated for ~24-48 hours after a training session, creating a broad "anabolic period." However, the window becomes more relevant under two conditions: (1) you trained completely fasted, or (2) you are an advanced athlete already maximizing all other variables. For most people, total daily nutrition far outweighs post-workout timing.