Fresh apples contain 85% water. Apples are rich in carbohydrates, vitamins and trace elements. Particularly high in vitamin A and carotene. Effects on Disease and Health Rich in water-soluble dietary fiber - pectin. Pectin has the effect of protecting the intestinal wall, activating useful bacteria in the intestines, adjusting the gastrointestinal function, as well as absorbing water, eliminating constipation, stabilizing blood sugar, beautifying the skin, and adsorbing bile and cholesterol, which can effectively prevent high blood lipids, high blood pressure, and high blood sugar, clean up the intestinal tract, and prevent colorectal cancer. Malic acid and citric acid in the sour flavor of apples can increase the secretion of gastric juice and promote digestion. Malic acid can also stabilize blood sugar and prevent diabetes, so diabetics are advised to eat sour apples. Apples are rich in potassium, which can prevent high blood pressure. The Chinese diet is heavily overloaded with salt, which leads to sodium and water retention in the body and promotes high blood pressure. Potassium increases the excretion of sodium from the kidneys, which promotes hypertension, and reduces the amount of sodium in the cells, thus lowering blood pressure. Potassium also dilates blood vessels and works with pectin*** to prevent metabolic syndrome. Apples also protect against cancer and lead poisoning. Apple juice has a very powerful role in killing infectious viruses, eat more apples than people do not eat or eat less apples have a lower chance of getting a cold. Therefore, some scientists and doctors refer to apples as "all-around health fruit", or "general practitioner". Nowadays, air pollution is more serious, eat more apples can improve the respiratory system and lung function, protect the lungs from pollution and soot. Apples have a natural pleasant aroma, with the obvious effect of eliminating the feeling of depression. Chinese medicine believes that apples are flat in nature and have the effect of tonifying the heart and moistening the lungs, generating fluids and detoxifying the body, benefiting the qi and stomach, and sobering up alcohol and calming the liver. Dietary taboos Apple should not be eaten with seafood. Apple contains ellagic acid, and seafood with food not only reduces the nutritional value of seafood protein, but also prone to abdominal pain, nausea, vomiting and so on. By the same token, other fruits containing more ellagic acid, such as strawberries, prunes, persimmons, pomegranates, lemons, grapes, sour grapefruit, etc., should not be eaten with seafood. Apples are very nutritious, eat apples should be chewed slowly, which is not only conducive to digestion, but more importantly, to reduce the human body disease is very good. Expectant mothers can eat an apple a day to reduce the reaction of pregnancy.