I have just discovered there is not way you can get 300-500 mgs of caffeine - the dose required to reduce the likelihood of getting Alzheimer's - without drinking coffee. Check out these tables that give info on the caffeine content of various popular drinks:
Caffeine Content
How Much Caffeine in Drinks -- Coffee, Tea, Soft Drinks -- Caffeine Content
Caffeine Content of Coffee, Tea, Chocolate
Just thought of this Lazy, don't know why i did not think of it before but no dose is a real high dose of caffeine.

