1. Yam is a very good food for the elderly and is known as a good health care product. Yam can not only regulate the spleen and stomach, but also enhance human immunity. 2. Honey is a very healthy food with rich and comprehensive nutrition. Proper consumption can improve human immunity. Old people can brew a cup of honey water every day to maintain vitality and regulate endocrine. 3. Radish is a very common food with high nutritional value. Radish has the function of invigorating the spleen, and it is rich in vitamin C. Eating radish in moderation for the elderly can enhance the body's immunity. These are some healthy foods suitable for the elderly. In addition to these foods, the elderly can also eat some nuts, fresh fruits, leafy vegetables, meat, eggs, milk, etc., which is good for improving immunity.