Black beans are flat and sweet; Entering the spleen and kidney meridian has the functions of invigorating the spleen and tonifying the kidney and detoxifying, while soybean is sweet and flat in nature, enters the spleen and large intestine meridian, strengthens the spleen and broadens the middle, moistens dryness and eliminates water, and has the effects of clearing away heat and detoxifying.

comments and suggestions: from the point of view of tonifying kidney, black beans have a stronger effect of tonifying kidney, and from the point of view of warming yang and dispelling cold, black beans are also better, while soybeans have a heat-clearing effect.