Food classification

Food can be divided into two categories: alkaline food and acidic food. People must mix acidic and alkaline foods to maintain the balance of blood PH in the body. The so-called acidic and alkaline foods are not identified by taste or taste, but mainly by the chemical elements contained in the food being absorbed and oxidized by the human body.

Generally, acidic foods contain more nonmetallic elements such as nitrogen, sulfur and phosphorus, while alkaline foods contain more metallic elements such as sodium, potassium, calcium and magnesium.

Either the taste is sour or acidic foods, such as vinegar, oranges, plums, apricots and other fruits are also acidic, but they are not acidic foods, but typical alkaline foods. Another example is animal meat such as cereals, sweets, cakes, fish and pork, which are not alkaline foods but acidic foods.

Extended data:

Sunscreen hydrating food:

1, avocado is UV-proof. Avocados contain monounsaturated fatty acids, which help skin resist ultraviolet rays, relieve allergies and inflammation, and increase skin elasticity. ?

2, zucchini delays aging. With high moisture content and low calories, it is very suitable for eating in summer. Moreover, it is rich in vitamins A, B and C needed by the skin, which helps to fight free radicals and delay aging. ?

3. Cucumber tightens the skin. Rich in vitamin C and caffeic acid, it can relieve edema, tighten skin and relieve sunburn. Cucumber is rich in silicon dioxide, which can activate enzymes that produce collagen and maintain skin elasticity.

4. Dark chocolate is anti-inflammatory. Dark chocolate can resist skin inflammation such as rosacea and eczema, and prevent skin from being damaged by ultraviolet rays. However, it should be noted that only high-purity dark chocolate has this effect. ?

5, watermelon hydration. Its water content is as high as 93%, and it contains a lot of vitamin A and vitamin C, which can make the skin radiant.

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