Is the garbage can in your kitchen filled with big piles of garbage every day? I’m afraid that half of them are food ingredients that you throw away. Bad Habit #1: Throwing away lettuce leaves and old cabbage leaves . Comment: Almost every part of a vegetable has nutritional value. For example, the concentration of carotenoids in the outer leaves of cabbage is more than ten times higher than in the center leaves, and vitamin C is several times higher. Another example is that lettuce leaves have higher levels of carotenoids, vitamin C and lutein than lettuce stems. Countermeasure: Even if you feel bad about mixing them up and stir-frying them, don’t throw the leaves away, but break them off and make another plate of veggies, or use the green leaves to make soup or stuffing. Bad Habit #2: Removing the skin of eggplant, radish, apple, sweet potato, and tomato. Comment: The most famous blood vessel strengthening effect of eggplant comes from the skin of the eggplant, it is a pity to throw away. Pungent radish skin contains a considerable amount of isothiocyanate substances, which is the key ingredient in the anti-cancer effect of radish. Apples, sweet potatoes and tomatoes skin rich in antioxidants and dietary fiber, also has a certain anti-cancer effect. Countermeasure: Try to eat whole fruits and vegetables. If you feel that they taste hindered, you can adjust the cooking method. For example, the old Beijing-style “fried eggplant skin” and “mixed radish skin” is unique. Bad Habit 3: Throwing away edible bones, marrow and cartilage. Comment: Animal bones are a treasure trove of nutrients. People usually think it can make up for calcium, in fact, its calcium is difficult to dissolve to be absorbed by the body, while the chondroitin sulfate, collagen is very beneficial to the beauty of things. Countermeasures: cook the bones more, preferably with a pressure cooker, and then can chew as much as possible to chew, swallow the juice, soft dry eat. Bad habit 4: throw away fish scales and the skin of chicken and duck. Comment: chicken, duck skin is rich in collagen, beneficial to the skin. Fish scales contain not only a lot of collagen, but also a lot of calcium. Countermeasure: Use the skin to cook soup, so that the collagen and flavor substances dissolved out, and then remove the oil, drink the soup and eat the skin has been removed from the oil. The scales can be scraped off, put in a pot of fish stew over low heat, and then eaten with the soup.