<human>:  What are the best foods for building muscle mass?
<bot>: Some of the best foods for building muscle mass include lean protein sources like chicken, turkey, fish, and eggs, complex carbohydrates like oatmeal, quinoa, and sweet potatoes, and foods high in healthy fats like avocado and almonds. Additionally, nutrient-rich foods like beans, legumes, and leafy greens are also beneficial for muscle growth.