Eating alkaline food is good for keeping fit. We should know that there are acid and alkali components in our daily diet, and they are produced by digestion, absorption and oxidation of chemical elements contained in food. Generally, nonmetallic elements such as chlorine, sulfur and phosphorus are foods with high acidity; Foods containing more metal elements such as potassium, sodium, calcium and magnesium are alkaline foods. What is acidic food and what is alkaline food cannot be understood literally, but should be judged according to the acid-base nature of the "residue" left in the body after the food is digested, absorbed and metabolized by the body. It should be noted that the pH of diet will affect human health. For example, because diet is transformed into blood cells under the action of intestinal villi, blood cells differentiate into cells, and the activity of cells is the strongest when body fluids are in a weak alkaline state, so paying attention to the acid-base balance of diet is also an important way to maintain health and longevity. Taking alkaline foods as an example, seaweed foods such as kelp have the highest alkaline content. No wonder kelp enjoys the reputation of "the most alkaline food" because of its highest alkalinity. Therefore, eating kelp three or four times a week can maintain the normal pH of blood and help prevent diseases and strengthen the body. No wonder some people say that the darker the color, the higher the alkali content. Interestingly, some foods taste sour, but there are many metal elements in them, so they are also alkaline foods. For example, lemons, sour plums, grapes, oranges and other fruits taste quite sour and even dare not taste them. In fact, they are alkaline foods. Another example is "Jianlibao", which people often like to drink and contains more metal elements, so it is also an alkaline drink. Besides kelp, soy products are the second most alkaline. For example, everyone knows that soybean milk is a beverage made of soybean, but few people know that it is rich in potassium and eight amino acids necessary for human body. In particular, cooked soybean milk is a food containing alkaline ingredients, and even can alleviate adverse reactions such as calcium deficiency, elevated blood sugar and elevated blood pressure caused by acidic foods. So, are citrus, oranges and grapefruit with strong acidity not acidic foods? This is because citrus is completely oxidized by human body, leaving behind alkaline mineral elements, making human body fluids alkaline. Because this fruit is an alkaline food, eating citrus often can prevent and treat heart disease, strengthen the detoxification ability of the liver, and inhibit or block the growth of cancer cells. There are also sweet potatoes (sweet potatoes), sweet potatoes, sweet potatoes and so on. , rich in calcium and various nutrients. Raw food and cooked food can neutralize excess acid in the body. This is an authentic physiological alkaline food, which can not be ignored. In fact, wild vegetables such as shepherd's purse and bracken should not be despised. This wild vegetable is rich and comprehensive in nutrition and is not polluted by pesticides. They are alkaline after digestion, absorption and decomposition, which helps to promote the acid-base balance of body fluids and maintain the normal pH value of blood. Therefore, if you can eat wild vegetables regularly, you can not only get rich nutrition from them, but also be of great benefit to eliminating fatigue and restoring physical strength.