There's room for any food on your plate as long as you keep calories under control. Sugary snacks and desserts can raise blood sugar faster than other foods because they contain practically no fibre — and fibre slows digestion of food and thereby tames its impact on blood sugar. Sugar also is pure calories, with virtually no nutrition. There's a deeper issue you should think about, though.Here are some tips on adding sugar and sweets to your diabetic diet.