Washing hair with vinegar generally has no effect on blood sugar. Vinegar is just a kind of seasoning in daily life, often used in cooking food, but washing hair with vinegar will not play any therapeutic effect, nor will it have any effect on blood glucose; moreover, vinegar is an acidic substance, and frequent washing of hair with vinegar may destroy the acid-base balance of the scalp. People who need to control blood sugar are recommended to maintain a low-salt, low-fat, low-sugar diet, control total calorie intake, exercise appropriately, and use hypoglycemic drugs such as acarbose, metformin, or insulin injections if necessary. People with high blood sugar should actively cooperate with doctors and choose scientific treatment methods.