Relationship between acidity and alkalinity of food and human body
The human body's demand for nutrition is not single, but a variety of combinations, including protein, fat, carbohydrates, vitamins, minerals and water. This requires people to diversify their food in the ordinary diet in order to obtain the nutrients needed to meet the growth and development of the human body and maintain the activities of various tissues and organs.
Food diversification is also the need to regulate body fluids and maintain pH balance. Under normal circumstances, the body fluid pH of healthy people should be maintained at 7.3-7.5, which is weakly alkaline. Food can be divided into acidic and alkaline. The acidity and alkalinity of food in nutrition refers to whether the final product is acidic or alkaline after food enters human body fluids and is digested and absorbed. For example, although some fruits taste acidic, they are actually alkaline foods, because these fruits contain organic acids, which give people an acidic feeling after entering the human body. However, such acidic substances are completely oxidized into carbon dioxide and water after entering the human body, and the remaining final products in the body are mostly alkaline compounds formed by metal cations such as sodium, potassium, calcium and magnesium. Generally, fruits, most vegetables, milk, dairy products, soybeans and their products are alkaline foods. Meat, eggs, fish and shrimp, grains, peanuts, peas and walnuts are all acidic foods. After they are digested and absorbed in the body, the products that finally enter human body fluids are acidic anions composed of nonmetallic elements such as phosphorus, sulfur and chlorine.
PH value of food: Generally, the pH value of food is defined as the number of milliliters consumed by neutralizing the aqueous solution of 100g ash powder with 0. 1mol/L standard alkali or acid solution. Generally, the symbol "+"indicates alkalinity and the symbol "-"indicates acidity. If the alkalinity of tofu is+0.2; The acidity of egg yolk is-18.80.
How much influence will the acidity and alkalinity of food have on the body? To tell the truth, the impact is very small. Because only a little change in the pH value of human blood and body fluids will cause metabolic disorder and confusion. Therefore, the human body has a good acid-base buffering system to keep the body fluid at a constant pH value and buffer the acid-base of food. For healthy people, the pH of urine is related to food: if you eat a lot of meat, urine is usually acidic; Vegetarians are more likely to have neutral or weakly alkaline urine.
From the perspective of nutrition and health care, food intake can achieve the best acid-base balance. Although the acidity and alkalinity of food itself have little effect on the body, whether it is eaten too acidic or too alkaline, it represents a nutritional imbalance, which will cause harm to health in the long run. Eating too much acidic food or alkaline food may cause related diseases. Therefore, when eating, we should pay due attention to scientific collocation to avoid excessive partial eclipse and maintain the acid-base balance in the human body. However, due to the change of life, there are many people with acidic constitution now, so we should avoid eating too much acidic food. If you eat too much acidic food, which leads to hyperacidity, you can let all kinds of patients come one after another. Juvenile dermatosis, constipation, dental caries, hyperacidity, neurasthenia, fatigue and burnout; Neuralgia, gastric ulcer, arteriosclerosis and elevated blood pressure in middle-aged and elderly people. Too much alkaline food will make body fluids alkaline, which will easily lead to diabetes, osteoporosis and even leukemia.
But it is a wrong cognition to use "acid and alkali" to divide the "good or bad" of food. It is right to eat less meat and more vegetables; If you eat too much acidic food, it is acceptable to eat some alkaline food to balance it, but don't overdo it. As long as we follow the principle of balanced diet and pay attention to eating enough natural fresh food, we can get good nutrition and acid-base balance.
Attachment 1: Physiological characterization of acidic constitution
1. dull skin.
2. hong kong foot.
I feel tired after a little exercise and want to sleep as soon as I get on the bus.
4. It is easy to wheeze when going up and down stairs.
5. Obesity and abdominal protrusion.
6. Slow pace and slow action.
Appendix 2: pH value of common foods
1. Strongly acidic foods: egg yolk, cheese, persimmons made of west point or sugar, mullet roe, firewood fish, etc.
2. Acidic foods: ham, bacon, chicken, tuna, pork, eel, beef, bread, wheat, cream, horse meat, etc.
3. Weakly acidic foods: white rice, peanuts, beer, wine, fried tofu, seaweed, clams, octopus and loach.
4. Weakly alkaline foods: red beans, radishes, apples, cabbages, onions and tofu.
5. Moderately alkaline food: dried radish, soybean, carrot, tomato, banana, orange, pumpkin, strawberry, protein, dried plum, lemon, spinach, spirulina, etc.
6. Strongly alkaline foods: grapes, tea, wine, kelp buds, kelp, etc.
Simple classification of food acidity and alkalinity;
Acidic food: animal food other than milk, such as grain, candy, cakes, fish, pork and other animal meat.
Alkaline food: plant food other than whole grains, such as fruits, vegetables and bean products; Among animal foods, only milk and animal blood are alkaline foods, and others are acidic foods.
Neutral food: oil, salt, coffee, tea, etc.