I read an interesting article on how excess sugar clogs the tiny blood vessels and tissues where there aren't really any blood vessels.

Circulation in these areas won't be as great by the nature of things so clogging them up has a greater impact. It prevents nutrient/waste flow to tissues. Just think about that for a bit. Accumulating waste and blocking delivery of nutrients.

Balancing sugar intake and moving around, even if it's just walking, on a regular basis will fix you up real fast.