Vinegar can be roughly divided into three types, namely brewing vinegar, synthetic vinegar and white vinegar. The largest number in China is fermented vinegar. Scientific analysis shows that fermented vinegar contains not only 5%-20% acetic acid, but also organic acids such as amino acids, lactic acid, succinic acid, oxalic acid and nicotinic acid, minerals such as protein, fat, calcium, phosphorus and iron, vitamin BI, vitamin B2, sugar and aromatic substance ethyl acetate. The content of organic acids and amino acids in rice vinegar made from rice is the highest.

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Modern medicine believes that vinegar has the following functions in treating diseases and preserving health:

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1, eliminating fatigue;

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2. Adjust the acid-base balance of blood and maintain the relative stability of human internal environment;

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3, help digestion, which is conducive to the absorption of nutrients in food;

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4, anti-aging, inhibiting and reducing the formation of peroxide in the process of human aging;

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5. Strong bactericidal ability, which can kill staphylococcus, Escherichia coli, dried bacteria, halophilic bacteria, etc. In the intestine;

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6. Enhance liver function and promote metabolism;

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7. Dilating blood vessels is beneficial to lowering blood pressure and preventing cardiovascular diseases;

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8, enhance renal function, have diuretic effect, and can reduce urine sugar content;

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9, can make the body's excess fat into physical exertion, and promote the metabolism of sugar and protein, which can prevent obesity;

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10, vinegar also contains anticancer substances.