1. Vegetables include: fresh and canned vegetables (excluding additives such as seasoning, fat and sugar); Tomato sauce. Explanation: vegetables can't be matched with non-core foods (such as fried beans, oil-soaked vegetables, and sugar-stained vegetables are not core foods); Vegetable juice is not the core food. 2. Fruits include fresh and canned (sugar-free) fruits. Note: if it is canned, it must be soaked in water or pure juice (not sugar water), and the soaked juice is inedible; Dried fruits (dried apricots, peaches, bananas, etc. ) are not core foods; Fruit juice is not the core food. 3. Soups include: fresh, frozen and canned (without additives such as seasoning, fat and sugar). Note: Western-style cream soup and concentrated broth are not core foods. 4. Skim dairy products and other milk substitutes include skim milk, skim cheese and skim sugar-free yogurt; Soymilk, bean curd and bean food without additives. Description: All the related foods made from the above raw materials, including milkshake and hot chocolate, must be sugar-free and low-calorie, and can be eaten once a day. 5. Eggs and their substitutes include whole eggs, protein and their artificial substitutes. Note: All kinds of egg foods provide high-quality protein, but be careful not to fry them.