 Losing body fat has been proven to improve blood glucose control and lower insulin levels.The most agreed-upon recommendation is for the diet to be low in sugar and refined carbohydrates, while relatively high in dietary fiber, especially soluble fiber.Likewise, people with diabetes may be encouraged to reduce their intake of carbohydrates that have a high glycemic index (GI), although the ADA and Diabetes UK note that further evidence for this recommendation is needed.