Caffeine

Type 2 diabetes

Blood sugar levels went up - triggers the release of adrenalin and makes cells less responsive to effects of insulin. glucose sticks to cell membranes and is converted to a sugar alohol called sorbitol with destroys nerves and other tissue. Retinopath and neuropathy result - burning feet, deafness, blindness and kidney failure, stroke, heart attack.

DECAF coffee not a problem
Most coffee drinkers exercise less, smoke more