The main components of liquor are ethanol (alcohol) and water. But ethanol is not the main nutritional component of wine, nor is it a harmful component of wine. Wine has a high calorie, according to the relevant scientific research departments, each milliliter of pure alcohol can produce calories 7 calories, equivalent to the caloric value of fat, significantly higher than the caloric value of sugar, protein. Moderate amount of alcohol is beneficial to the human body. White wine within the acetic acid, lactic acid, ethyl acetate, butyric acid ethyl ester, lactic acid ethyl fat, isoamyl alcohol and other substances are necessary for human health. So white wine is nutritious.

Harmful substances in white wine, one is the amount of pesticide residues. The raw materials used in brewing, such as grains and potato crops, etc., in the growth process, such as the excessive application of pesticides, the poison will remain in the seeds or tubers. When such raw materials are used to make wine, the pesticides are carried into the wine, which affects health when consumed. According to the Ministry of Health, per kilogram of grain, pesticide 666 shall not exceed 0.3 milligrams, DDT shall not exceed 0.2 milligrams.

Second, methanol. Methanol is a colorless liquid with anesthetic properties, density 0.791, boiling point 64.70 ℃, can be infinitely soluble in water and alcohol. It has an alcoholic taste and pungent odor, very toxic, harmful to human health, excessive consumption, dizziness, headache, tinnitus, blurred vision. 10 milliliters of methanol can cause severe poisoning, eye blindness; acute people can be nausea, stomach pain, respiratory distress, coma, and even life-threatening. According to the regulations of the Ministry of Health, the methanol content per 100 ml of cereal wine shall not exceed 0.04 grams. Dried potatoes and substitute raw material wine shall not exceed 0.12 grams.

Third, aldehydes. Aldehydes are mainly produced during the production and fermentation of liquor. It has a large irritating and pungent flavor. Aldehydes in the formaldehyde toxicity is the largest, drinking content of 10 grams of formaldehyde can make people die. Followed by acetaldehyde and furfural. Acetaldehyde is an extremely volatile colorless liquid, soluble in alcohol and water. In the steamed wine, the head of the most content, after storage, will gradually evaporate some. People often drink alcohol with high content of acetaldehyde and are prone to alcohol addiction. Acetaldehyde toxicity is equivalent to 83 times of ethanol. Therefore, its content in white wine must be very tiny.

Fourth, heterohydric alcohol oil. Heteroalcohol oil is a colorless oily liquid, which is one of the important components of white wine. From a health point of view, it is a harmful substance, the content is too high, harmful to the human body, can make the nervous system congestion, make people headache, dizziness. Drinking alcohol to the head is mainly the role of heterohydric alcohol oil. It oxidizes slowly in the human body, stays for a long time, and easily causes bad drunkenness. The content of hetero-alcohol oil is too much, and it will also cause the milky white turbidity of white wine when adding pulp. Its content generally does not exceed 0.15 grams per milliliter.

Fifth, lead. Lead in white wine is mainly from brewing equipment, wine containers, sales of wine tools. Lead is extremely harmful to the human body, it can accumulate in the human body and cause chronic poisoning, the symptoms of which are headache, dizziness, memory loss, weak hand grip, poor sleep, anemia and so on. State regulations on the amount of lead in white wine, for each liter of white wine containing lead shall not exceed 1 mg.