10 Leucine-Rich Foods for Muscle Health After 40

Leucine, an essential branched-chain amino acid, is critical for muscle maintenance, growth, and recovery, especially after age 40. The body cannot produce it, so dietary intake is necessary. Recommended daily intake is 4.2–4.5 grams, or 55 mg per kg of body weight. Ten leucine-rich foods include soybeans (3.5g/100g), Parmesan cheese (3.4g/100g), black sesame seeds (0.25g per 2 tbsp), eggs (0.6g each), pumpkin seeds (0.65g per 3 tbsp), lentils (1.3g per cup), hemp seeds (0.25g per 3 tbsp), peanuts (1.5g/100g), spirulina (0.69g per 2 tbsp), and cottage cheese. These options benefit both omnivores and plant-based diets. Dr. Stacy Sims, a nutrition scientist at Stanford, recommends strength training alongside leucine-rich foods to combat sarcopenia, osteoporosis, and chronic diseases.