The more natural the cold salad, the better. An Jianhua, a nutritionist at the Nutrition Research Center of Beijing Normal University, said that vitamins are water-soluble substances, and vegetables are easy to lose vitamins after blanching. She reminded people that eating raw food in summer is easy to breed bacteria and cause intestinal diseases, so raw food must be hygienic and washed before eating. Garlic and vinegar have bactericidal effect. It is suggested to add vinegar and garlic to the cold salad, which can both flavor and sterilize, but those with excessive gastric acid secretion should try not to add it.