It can be said that the nutrition of food is one of the most direct and important ways to prevent against aging and enhance immunity. In order to bring health and longevity for seniors, we should prepare several types of longevity dishes on the dinner table for the elderly people. Generally speaking, there are mainly four kinds of food that can prolong human life.

First, soybean products
Soybean products include tofu, soybean milk, bean curd sheets, steamed bean curd roll and so on. Besides the rich content of high-quality protein and minerals, and trace elements, soybeans also contain many other functional components, such as isoflavones, oligosaccharides, dietary fiber, lecithin, linoleic acid, etc. All of these nutrients are the active substances beneficial to human health, which can lower blood fat, blood sugar and blood pressure, help lose weight, prevent osteoporosis, improve memory and so on. As a result, it can be regarded as a longevity food.

Second, vegetables
Vegetables are the main food to supply minerals and vitamins for human body. Especially for vitamin C, β-carotene, and dietary fiber, which mainly come from vegetables. In addition, because of its lower glycemic index and strong antioxidation effect, vegetables have become an essential food for anti-aging and disease prevention for elderly people. There are many kinds of vegetables, in which bitter gourd is one of the most typical one. Bitter gourd is rich in vitamin C, vitamin E, carotene, zinc and selenium. It has good antioxidation effect and can enhance human immunity. Traditional Chinese medicine believes that bitter melon can relieve summer heat, improve eyesight, and lower the blood sugar.

Third, fish
Fish is the main food source of the high-quality protein needed by human body. Every 100 grams of fish contain about 20 grams of protein. Unlike the meat, the fat contained in fish is mainly composed by unsaturated fatty acids. Especially the deep-sea fish, it is rich in DHA (docosahexaenoic acid) and EPA (eicosapentaenoic acid), which can help reduce blood cholesterol and prevent cardiovascular and cerebrovascular diseases. What's more, fish also contains plenty of vitamin A, vitamin B2, iron, zinc and other trace elements.

Fourth, fungus and algae foods
Fungus and algae foods include mushrooms, agaric, tremella, kelp, seaweed and so on. Fungus and algae foods are lower in calorie, but contain a lot of protein, dietary fiber, vitamins and trace elements. Some trace elements such as iron, zinc, selenium and iodine are very rich in fungus and algae foods, especially iodine, which is unique in seafood plants. Fungus and algae foods also play an important role in health care. They have the effects of enhancing immunity, resisting tumor, lowering blood cholesterol, preventing the formation of thrombosis, etc.