This video by a doctor explains the things that benefit your brain and decrease the risk of Alzheimers. Whats good for the heart is also good for the brain. A mediterranean diet (veg, fruit, nuts, olive oil, less meat, more fish), 7-8 hrs of sleep, lots of social interaction, intellectual challenges, learning new things, and stress management are all beneficial for longevity and brain+heart heath.
Creating Healthy Lifestyles