I am doing a project and i want to know is diabetes hereditary?

To a point, yes. But as far as Type II diabetes is concerned, anything can set if off, including a high level of stress (kept on for a somewhat long period of time).Naturally, being overly fat and not execising are a good way to get it, even if no diabetes exists in your family (if your family has a history of heart attacks, your looking for more trouble).