Diabetics used to be advised to avoid all sugary foods, berries included. However, modern studies have proved that berries should not be in the list of forbidden foods. Berries contain natural sugar, named fructose, which doesn't increase insulin. Berries are not only delicious; they are also healthy thanks to antioxidants. Make a smoothie with berries or add some currants, strawberries and raspberries to your morning oatmeal or salads.