A few cups of coffee a day may stave off Alzheimer’s disease and could even help to treat the condition, according to new research. Patients with Alzheimer’s disease have sticky clumps of abnormal protein in the brain called beta amyloid plaques. Caffeine was given to mice and researchers recorded a 50% reduction in levels of beta amyloid protein in their brains. The creatures also developed better memories and quicker thinking. The equivalent dose in humans would be 500 milligrams of caffeine a day, or just 5 cups of ordinary coffee or 14 cups of tea.