What food does "healthy food" mean?

The World Health Organization has spent three years analyzing and studying various foods involved in people's daily diet, and selected the best vegetables, fruits, meat, oils, soups and brain-protecting foods. The best vegetables: sweet potato, cabbage, beet, celery, carrot, asparagus, cauliflower, eggplant, shepherd's purse, kohlrabi, Flammulina velutipes, potherb mustard and Chinese cabbage. Sweet potato is the most unforgettable. It is rich in fiber, potassium, iron and vitamin B6, which can not only prevent aging and arteriosclerosis, but also be an anti-cancer expert, so it was chosen as the first vegetable. Try to achieve an acid-base balance in your daily diet. The pH value of healthy people should reach about 7.3, and the meat people eat on weekdays is almost acidic, so they can eat more alkaline foods, such as Chinese cabbage, celery and carrots. Best fruits: papaya, strawberry, kiwi, mango, apricot, persimmon and watermelon. The first fruit is papaya, which is not only rich in vitamin C (higher than oranges), but also helps to digest the meat that is difficult to absorb in the human body and can prevent gastric ulcer. Girls who love beauty should especially eat more strawberries, which are sweet and juicy and can make your skin rosy. Strawberries also have the functions of stopping diarrhea, consolidating gums, refreshing breath and moistening throat. Best meat: goose, duck and chicken. Although meat is rich in fat, it is also indispensable in daily diet, but it should be chosen correctly. The chemical structure of goose and duck meat is very close to olive oil, which is good for the heart, especially for the elderly. Chicken is recognized as the "best source of protein", and the elderly and children should supplement it in time. Remember to drink fresh soup after eating chicken. The best Tang Fei chicken soup, especially hen soup, can prevent and treat colds and bronchitis, especially in winter and spring. Among the best meat, we also found the best cooking oil and the best soup. The best brain food: walnuts, peanuts, pistachios, cashews, pine nuts, almonds, soybeans and so on. Now people are concerned about what they eat to replenish their brains. These shelled foods can not only protect the brain, but also be eaten as snacks.