Dry mouth is characterized by subjective thirst and the desire to drink water, and the symptoms improve slightly after drinking, but soon the thirst starts again. Pay attention to the dry mouth caused by stomatitis, diabetes and other reasons. Dry mouth thirst patients diet “three appropriate”: 1, grains and cereals, such as oat noodles, buckwheat noodles, oatmeal, cornmeal and other staple foods rich in vitamin B, a variety of trace elements and dietary fiber, long-term consumption can reduce blood sugar, blood lipids; 2, beans and soy products, soy foods are rich in protein, inorganic salts and vitamins, and soybean oil contains Unsaturated fatty acids, can reduce serum cholesterol and triglycerides; 3, bitter melon, freeze-dried mulberry leaves, onions, shiitake mushrooms, grapefruit, pumpkin can lower blood sugar, is the most ideal food for diabetics, such as long-term consumption of some plant active selenium, the effect of lowering blood sugar and preventing complications will be better. Dry mouth and thirst patients’ diet “three should not”: should not eat a variety of sugar, preserves, canned fruit, soft drinks, fruit juice, jam, ice cream, sweet cookies, sweet bread and sugar pastries, etc., because these foods contain high sugar, will aggravate the symptoms of dry mouth and thirst; should not eat foods containing high cholesterol and animal fat, such as animal brain, liver, heart, lung, waist, egg yolk, etc. It is not advisable to eat foods with high cholesterol and animal fat, such as animal brain, liver, heart, lung, waist, egg yolk, fatty meat, butter, pig, cow and lamb oil, etc. These foods are easy to make blood fat rise and atherosclerosis easily occur; it is not advisable to drink alcohol, alcohol can make blood sugar fluctuate, and serious hypoglycemia can occur when drinking a lot of alcohol on an empty stomach.