Longan is a tonic, which is hot and not suitable for summer. The elderly have less activities, less consumption and a light diet in summer. Eating lotus root starch, noodle soup, vegetables for curing diarrhea, steamed eggs, salted shrimp, cold tofu, sweet and sour gluten, shredded chicken with mung bean sprouts, and Artemisia selengensis meatball soup are all common and easy to cook in summer. You can also buy some convenience foods such as pork floss and salted duck eggs, and cook some porridge, which is also good. If you really can't do it, go to the bookstore and buy two home cooking recipes. You can learn them by heart. That's how I got here. Eat some fruit in moderation every day.