For the elderly, the synthetic ability of protein is poor, and at the same time, the utilization rate of protein is reduced, and its liver and kidney function is also reduced; So to choose some high-quality protein, milk and beans are good choices, especially beans. Although soybean is a plant food, its protein is similar to protein in animal food, and it belongs to high-quality protein in nutrition. High-quality protein is very important for maintaining the physiological functions of the elderly, such as the integrity of tissues and cells, immune function and so on. On the other hand, the fat content of milk and beans is different. The fat in milk belongs to animal fat, mainly saturated fatty acids; The fat in soybean milk belongs to plant fat, mainly unsaturated fatty acids, with less saturated fatty acids. When you get old, your body's ability to transport fat from your blood gradually declines, so the elderly should limit their intake of fat, especially saturated fatty acids. If the fat intake is too high, it will stay in the blood and precipitate easily, thus blocking blood vessels. Therefore, the elderly drink more soy milk, which can supplement high-quality protein without consuming too much saturated fatty acids. Drink milk, too. There are two reasons: First, the elderly need calcium supplement, and milk contains more calcium, which is easier to absorb. With the increase of age, bone minerals are continuously lost and bone density is gradually reduced; At the same time, the calcium absorption capacity of the elderly is also declining. If calcium intake is insufficient, osteoporosis or fracture is more likely to occur. Therefore, the elderly should pay attention to supplement calcium and vitamin D.