One of my best mates is a type one diabetic, due to him I eat wholegrain bread instead of white.My best friend...a skinny guy...just died last year of heart blockages. The homemade iced tea he drank everyday was so sweet it would make your teeth sing. He was 54 and ate sugar to excess. I feel like crap when insulin is released to bring down way high blood sugar. You don't realize how bad you feel until you stop abusing your insulin response and experience a steady level of blood sugar, as opposed to spiking blood sugar, then low blood sugar when insulin floods your bloodstream, which makes you crave more sugar...it a very bad cycle to be in.
You blood sugar needs to stay within certain parameters... between 70 and 120 milligrams per decilitre of blood if memory serves...too high (like 300 after you drink a coke) and insulin is released, too low, and you go into sugar shock...which can be fatal.
I dated a girl for 3 years that was a diabetic, so I got to understand the role refined sugar plays in the diet. It's the villian.