First of all, does your old man have any medical history, such as hypertension and diabetes? Still in good health. Don't give milk and soybean milk to the elderly, because they are all gas-producing foods, and flatulence is even worse. At this stage, if you have no appetite, you can make some light and delicious things, such as stewed eggs with meat foam (the meat foam must be broken, mainly lean meat, and a little shrimp skin can also be added), small wonton, rotten noodles (with a little shredded vegetable foam), steamed pumpkin, fried shredded chicken, fried tofu with egg white, fish porridge, chicken porridge, mushroom porridge and so on. , mainly from the dietary preferences of the elderly. If he doesn't go to see a doctor, your family can go to the hospital to sign up and tell the doctor about the old man carefully to see if they have any good ideas and suggestions.