Astringent food is mainly due to the presence of tannin, phytic acid and oxalic acid in food. These substances will combine with proteins in saliva and precipitate in the mouth, causing saliva to lose its slipperiness and produce an astringent taste. However, such astringent foods generally have strong antioxidant properties, which are very good for the prevention of hypertension and diabetes. With the progress of society and the birth of many food processing plants, the food we eat has become more and more refined and diverse in taste. We usually prefer to tend to choose some of our favorite, sweet and flavorful food, and do not like to eat rough, bitter-tasting food. Because the taste of poor food will reduce the desire for food, but precisely these foods have unexpected nutrition. The following several taste is not particularly good food but can help longevity. Rough food Many people do not like nest and brown rice, especially southerners, because the south is known as the “land of fish and rice”, mainly rice. They feel that the nest and brown rice taste bad, stuck in the throat, not easy to swallow, always prefer the fine processing of rice and pasta. In fact, these coarse foods contain a large amount of dietary fiber, which can stimulate intestinal peristalsis, laxative and smooth. Dietary fiber can also change the type and number of microorganisms in the intestine and reduce the generation of carcinogenic substances. So usually eat more cereals of rice, oats, red beans, etc. can ensure smooth laxation and clear the body of toxic materials. It is recommended to drink more mixed grain porridge for breakfast. Astringent food Food is astringent mainly because the food contains tannin, phytic acid and oxalic acid. These substances in the mouth will be combined with the protein in the saliva precipitation, so that the saliva loses its slipperiness and produces astringent taste. However, these astringent foods generally have strong antioxidant properties, which are very beneficial for the prevention of hypertension and diabetes. These astringent elements are mainly found in the skin of foods, which contains more substances than the flesh of the fruit. These foods are mainly apple skins, purple grape skins, walnut skins and olives. So it is recommended not to remove the skin when eating such foods. Sour food There are some sour fruits among the fruits, such as: sand fruit, hawthorn. People generally prefer the sweet taste of oranges, watermelon, kiwi, dragon fruit and so on. In fact, these kinds of sour fruits help longevity, because these kinds of acidic fruits contain organic acids such as citric acid, malic acid, etc. These organic acids can promote the absorption of minerals such as iron, so that the body’s mineral elements are replenished and the body remains healthy and vital. If you feel that you really can’t eat, you can make a fruit salad and add some icing sugar to it, the taste will be better. Bitter food When it comes to bitter food, many people naturally think of bitter melon, grapefruit, tea, etc. In fact, the bitter taste in these foods is mainly due to the quinine in the bitter melon, tea inside the polyphenols, grapefruit in the naringin. Never underestimate these substances, they have a health role, to improve the body’s immunity, control blood sugar, the role of cancer and heart disease prevention. So in the normal diet can not be picky eater, specialize in eating some sweet, not eat bitter acidic food.