In healthy young adults, a 20-gram protein dose delivered within a high-carbohydrate whole-food matrix (beans and rice) produces a muscle-building response statistically equivalent to that produced by the same 20-gram protein dose delivered as an isolated nutrient mixture, when total protein and carbohydrate content are matched.

After exercise, amino acids from digested protein enter the bloodstream and are taken up by muscle cells, where they trigger a molecular switch that turns on protein production. This switch activates a chain of signals that instruct the cell's machinery to build new muscle proteins at the same rate whether the amino acids come from beans and rice or from a lab-made powder, as long as the total amount of protein and carbohydrates is the same.