Dementia can be prevented by controlling chronic diseases, weight control, socialization and exercise. 1. Control of chronic diseases: If you suffer from hypertension, diabetes, hyperlipidemia and other chronic diseases, you should actively standardize the treatment under the guidance of a professional doctor to prevent the condition from progressing and to avoid cerebrovascular lesions that increase the rate of brain degeneration, so as to reduce the probability of dementia occurring. 2. Weight control: appropriate weight control, obesity can lead to changes in blood lipids, blood pressure, blood sugar, thus accelerating the rate of brain aging, the risk of dementia. 3. Socialization and sports: Communicate more with others and engage in outdoor sports, which can improve the blood circulation of the brain. In addition, by quitting smoking and drinking, effectively reducing the damage to the brain, and exercising the brain function appropriately, including learning, communication, etc., all have the effect of slowing down the aging of the brain, which is helpful for the prevention of dementia. Regular health check can be done.