Maintain a healthy lifestyle by eating nutritious meals, exercising regularly, staying socially and mentally active, and getting regular health checkups in order to potentially reduce the risk of dementia. Key aspects include maintaining a healthy weight, stopping smoking, limiting alcohol, controlling blood pressure and diabetes, and adopting a heart-healthy lifestyle. While there is no certain way to prevent dementia, reducing risks early is important as brain changes may start 10-20 years before symptoms appear.