Also, the diabetes issue means you need to be aware of the amount od carbs that you are consuming and to make healthier choices. Stay away from most “white” foods (white bread, potatoes,pastas, and rice), and eat their more colorful counterparts, like whole wheat or multi grain breads, plain oatmeal (you can throw in some blueberries), whole wheat pastas, and sweet potatoes (which have a lower glycemic index and are metabolized more slowly so the sugar does not rise too quickly). The only white food I would recommend is fat-free plain yogurt, to which I (HAVE TO) add a packet of Truvia no-calorie sweetener and some blueberries, or the plain yogurt with cucumbers, scallions, and other non-starchy veggies, cut up. tastes better than you expect.
In general eating LOTS of cruciferous fiber rich foods will help you. You will feel like a new person. I promise. And please try to drink water throughout the day. It helps keep you feeling full, and will keep you hydrated much better than diet soda.