Diabetes is genetic (both types). It is not brought on by eating too much sugar. Eating too much sugar causes obesity.
Reference:
Can too much sugar cause diabetes?
A recent study has found that fake sugar (or "sugar free") has been found to cause weight gain. (Apparently, our bodies' metabolism do not process fake sugar as well as natural sugar.)
Reference:
Fake Sugar Could Make You Fat | Wired Science from Wired.com
Step back from the Samoas and nobody gets hurt.