Yam powder is a kind of nutritious food with mild nature and obvious nourishing effect. It can tonify the spleen and stomach, tonify the kidney and strengthen yang, and can be eaten at any time at ordinary times. However, it is best to eat yam powder when the body consumes too much energy from three to four o'clock every afternoon. At this time, eating yam powder can not only replenish energy for the body, but also accelerate the body's absorption and utilization of nutrients in yam powder, which can give full play to its health-care and health-keeping effects.