A daily dose of chocolate could be the key to preventing Alzheimer's disease, according to recent research. Blood flow to the brain was boosted and memory improved among volunteers who drank two cups of hot chocolate a day over a thirty day period. They were tested for memory and thinking skills, and ultrasound measured the blood flow to the brain. Participants showed an average 8.3% improvement in blood flow and memory scores improved, with recall times falling from 167 to 116 seconds on average. The study suggests that drinking hot chocolate regularly could help keep the brain healthy.