As the body ages, it grows less adept at converting food into muscle — a quiet biological shift with profound consequences for independence and vitality. Registered dietitians, responding to a marketplace cluttered with processed protein claims, are pointing older adults back toward whole foods: the humble egg, the can of beans, the cup of Greek yogurt. The wisdom here is ancient even if the science is new — that nourishment drawn from real ingredients, taken consistently across the day, is among the most reliable investments a person can make in their own future mobility.