1, give priority to a light and refreshing diet that can stimulate appetite. In dietary distribution, we should pay attention to the color, aroma and taste of food to improve appetite. 2. when cooking, add vinegar in moderation, which can not only enhance the taste, but also protect vitamin C, sterilize and increase appetite. It is good to drink some porridge for breakfast and dinner, which can quench thirst, relieve summer heat and nourish the body. In summer, the elderly should also pay attention to eat less non-greasy food and eat more light and clean food. For the elderly who are weak, we should avoid eating cold drinks and cold fruits, so as not to cause digestive dysfunction and cause illness. 5. Drinking drinks can't replace drinking water. Because most drinks contain a certain amount of sugar, the higher the sugar in the drink, the higher the osmotic pressure, and the less easily it is absorbed by cells, but it will take away the water in the cells and easily cause water loss in the body. In addition, cold drinks are often difficult to quench thirst, leading to frequent overeating, which is a strong cold stimulus to the digestive tract, causing abnormal peristalsis and dysfunction of the digestive tract, leading to abdominal pain and diarrhea. 6, the knowledge of drinking water, don't wait for thirst before drinking water: Many people's living habits are determined by thirst, in fact, this is unscientific. Because thirst means that the body's water is out of balance, cells begin to dehydrate, and it is too late to drink water. Great thirst is easy to drink: if people are thirsty, they are most likely to drink too much water at a time, which makes the stomach difficult to adapt and causes adverse consequences. The ancients advocated "don't drink too much if you don't want to be extremely thirsty", which is a scientific method to prevent thirst and choose to drink water. If you are thirsty, drink water slowly to avoid harm to your body. It is not advisable to drink more water before going to bed, because when people are asleep, the human body only maintains basic metabolism, and all kinds of metabolism are very slow, so it doesn't need too much water, and drinking too much water before going to bed is not conducive to rest at night. It is not advisable to drink water when eating, because drinking water when eating will dilute the digestive juice, which is not conducive to the digestion and absorption of food, and will be harmful to the body in the long run. Drinking water in the morning is good for health: because drinking water in the morning can replenish the water consumed overnight, reduce blood concentration, promote blood circulation and maintain the normal level of body fluids. It is best to drink mineral water: because mineral water does not contain sugary water, it has no stimulating effect, unlike some drinks which are irritating and fruit juice drinks which contain a lot of sugar. In some developed countries, people think that mineral water is the best healthy drink. 7. Keeping an indifferent and quiet mind is extremely important for summer health. Calm down, be broad-minded, calm down and avoid internal fires. 8. In summer, when the monarch is in season, the weather is hot and the heat is warm. People should go to bed late and get up early, conform to nature and maintain yang. 9. The summer climate is hot, which consumes a lot of human body. If you exercise in the sun for a long time, it may lead to heatstroke.