The diet recommended for people who suffer from diabetes mellitus is one that is high in dietary fibre, particularly soluble fibre, but low in fat. Patients may be encouraged to reduce their intake of carbohydrates that have a high glycemic index. However, in cases of hypoglycemia, they are advised to have food or drink that can raise blood glucose quickly, followed by a long-acting carbohydrate (such as rye bread) to prevent risk of further hypoglycaemia.

Recently, Diabetes UK have warned against purchase of products that are specially made for people with diabetes, on the grounds that:

1. They may be expensive,
2. They may contain high levels of fat and
3. They may confer no special benefits to people who suffer from diabetes.