Fact: Diabetes is not caused by eating sugar. Refined sugar that's found in foods is completely different than "blood sugar."
Type 1 diabetes occurs when people have little or no insulin in their body.
Type 2 diabetes occurs when your body cannot properly use the insulin it makes. In time, it is no longer able to make enough insulin to keep up.
Insulin is responsible for moving glucose from the bloodstream to the cells. If you don't have insulin, the glucose stays in the bloodstream. This is why people with diabetes have "high blood sugar."