To have a boy, men eat more acidic foods and women eat alkaline foods, which can help to have a boy; while men eat more alkaline foods and women eat more acidic foods, which is more favorable to have a girl.　　However, the claim that diet changes the constitution has not yet been verified, so if you want to decide whether to have a boy or a girl, you may have to rely on chance. In fact, as long as you don't favor one type of food over another and take a balanced diet, it's not a bad idea to try this approach.　　Acidic foods Milk, eggs, fish, meat (e.g., beef, chicken, pork, fish) Sour fruits (e.g., tomatoes, oranges, strawberries, grapes, pineapples, apples) Boys: Men should eat acidic foods. Girls: Women should eat acidic foods. Alkaline foods Beans (e.g., green peas, soybeans, red peas, tofu) Vegetables, lettuce, potatoes, bamboo shoots, onions, shiitake mushrooms, cauliflower, kelp Fruits (banana, watermelon, loquat) Wheat flour products, milk, tea If you want to have a boy, women should eat alkaline foods. If you want to have a girl, men should eat alkaline foods. If you want to have a boy, you should keep your body fluids weakly alkaline by stopping strenuous exercise and reducing your energy consumption; in addition, you should consume more alkaline foods such as fresh vegetables and fruits on a daily basis. If you want to have a girl, you should slightly make the fluid acidification, by increasing the amount of exercise and often do indoor physical labor, daily more acidic food such as rice, fish, meat, eggs and so on.