Diabetes isn’t caused by eating too much sugar. However being overweight can lead to diabetes and excessive consumption of sugar can make one obese/overweight.
Type 1 diabetes also known as insulin-dependent diabetes or juvenile diabetes often occur in children and young adults.
Family history is only one out of the several risk factors for type 2 diabetes.
Staying slim cuts the risk, but doesn’t totally eliminate the chances of having diabetes.
Not all types of diabetes can be prevented. Type 1 is an autoimmune condition (a condition in which the immune system attacks your body) and it cannot be prevented.