From this article, More coffee = less cancer? :
Regular coffee drinkers — defined as four cups or more a day — reduce their risk of the cancers by 39 percent, according to a study published Tuesday by the American Association for Cancer Research.
From this article New evidence that drinking coffee may reduce the risk of diabetes:
From this article Caffeine May Prevent and Help Reverse Alzheimer's Disease:
There's new and stunning research 
that strongly suggests a substance found in nature offers another a way to fight Alzheimer's and maybe even reverse its effects: caffeine.
From this Sky News article Coffee May Cure Alzheimer's Disease:
From this article Energy drinks' caffeine in line with coffee:
