As mentioned in the previous article, the treatment of dementia is difficult, so how to prevent it is probably the focus of most middle-aged and elderly people, and if it can be effectively prevented will delay the onset of the disease and reduce the number of patients, the value of which is immeasurable. In brief, the preventive measures are: 1. Intervention of risk factors. To carry out prevention, we should first understand the risk factors for dementia, mainly including advanced age, gender (higher in women), low education, cerebrovascular disease and traumatic brain injury, but also related to genetics, hypothyroidism, exposure to heavy metals and other toxic chemicals. There have been many attempts to target risk factors, but the overall preventive effect has been unsatisfactory, and certain factors (such as age, gender and genetics) are difficult to modify and targeted prevention is not possible. Cardiovascular disease and its risk factors (such as hypertension, hyperlipidemia, diabetes, smoking, atrial fibrillation and obesity) may be risk factors for dementia, and there may be a preventive effect through lifestyle changes and effective treatment of hypertension, hyperlipidemia and diabetes. The overall results of several studies show that antihypertensive treatment reduces the risk of dementia, even though antihypertensive treatment or interventions for other cardiovascular risk factors are not as strong in reduce the risk of dementia is modest, treatment should still be active. Another level of prevention is to intervene in older adults with mild cognitive impairment who have symptoms such as memory impairment in the hope of delaying their progression to dementia, although effective prevention is of course based on early diagnosis. Although current evidence shows limited delaying effects of drugs such as cholinesterase inhibitors, aspirin, vitamin E, and ginkgo preparations, there is no objection to trial of these drugs; 2. Lifestyle changes. A healthy lifestyle has a preventive effect on the onset of dementia, such as appropriate physical exercise, walking, jogging, tai chi and fitness dance activities are worth advocating, there is a saying: “good for the heart is good for the brain”. Other include healthy eating habits, a small amount of alcohol, more nuts containing unsaturated fatty acids and vitamin E food. Most seniors know about this, but it’s important to stick to it; 3. Cognitive training. As the saying goes, using more brainpower has the potential to reduce the risk of Alzheimer’s disease, easy to do. Seniors should actively participate in chess, mahjong, poker, theater, photography, calligraphy, painting and travel to cultivate their bodies and create a social atmosphere. Investment in finance certainly requires brain power, but care should be taken to avoid placing too much emphasis on winning and losing, which will increase psychological pressure. In summary, the causes and pathogenesis of Alzheimer’s disease are complex, and effective treatment and prevention is not easy. For elderly people with memory loss, difficulty in understanding or expressing speech, easy to get lost, and reduced ability to work and live, it is recommended that they should go to a professional medical institution for consultation and intervention as early as possible. Some media have been promoting the preventive and therapeutic effects of some health products, “drugs” and so-called new technologies on dementia, which are not credible.