In the process of food processing, certain additives need to be added, such as synthetic colors, flavors, sweeteners and preservatives, etc. Most of these substances are synthetic chemicals, which have little effect on humans when consumed within the normal range. Most of these substances are synthetic chemicals, in the normal range of consumption on the human impact is not significant. If consumed in excess, it is harmful to human health

Flavorings, including natural and synthetic, are one of the two categories of food additives.

The use of synthetic flavors, in accordance with national health standards, otherwise, there are

hazards to human health. Flavor esters, aldehydes, alcohols, ketones, phenols and so on, some varieties can cause chronic poisoning, and even teratogenic, carcinogenic, therefore, the family should not use flavor.