Food additives are artificial or natural substances that are added to food for the purpose of improving the color, aroma, and taste of food, as well as for the needs of anti-corrosion and processing technology. At present, there are 23 categories of food additives with more than 2,000 varieties, including acidity regulators, anticaking agents, defoamers, antioxidants, bleaching agents, leavening agents, colorants, color retention agents, enzyme preparations, and flavor enhancers , Nutritional fortifiers, preservatives, sweeteners, thickeners, spices, etc.