Brain stroke occurs when a blood vessel in the brain bleeds or is blocked by a clot, depriving brain tissue of oxygen. The main risk factors for brain stroke include an unhealthy diet high in saturated fats that can increase blood pressure and cholesterol, high blood pressure, certain medications like blood thinners, excessive alcohol consumption, and physical inactivity. Maintaining a balanced diet, exercising regularly, monitoring blood pressure, taking medications appropriately, and drinking alcohol in moderation can help reduce the risk of brain stroke.