The A positive (and A negative) blood type diet

New diets focusing on blood type have found numerous supporters.

Caffeine is the most widely used drug, but little is known about helping those who depend on it

“I’m a zombie without my morning coffee.” “My blood type is Diet Coke.” “Caffeine isn’t a drug, it’s a vitamin.” Most people make jokes like these about needing a daily boost from their favorite caffeinated beverage – whether first thing in the morning or to prevent the after-lunch slump.