Risk of Alzheimer's disease can be reduced (though not completely prevented) with healthy habits: eat a Mediterranean-style diet rich in vegetables, fruits, whole grains, nuts, olive oil, and fish; limit sugar and processed foods; stay physically active with daily walking or light exercise; keep your mind engaged with reading, puzzles, or social activities; and maintain good sleep. Also control blood pressure, diabetes, and cholesterol, avoid smoking and excess alcohol, and have regular check-ups. these steps together help protect brain health.