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You can't guarantee prevention. But these habits meaningfully lower the risk

There is no guaranteed way to prevent dementia, but risk can sometimes be reduced. Good steps include controlling blood pressure, staying physically active, eating a balanced diet, not smoking, limiting alcohol, sleeping well, and keeping the brain and social life active. Managing diabetes, hearing loss, and depression may also help. Protecting against head injury is important too. These habits cannot eliminate risk, but they may support overall brain health and lower the chance of decline.