It depends on the intensity and duration of the workout. Diabetes experts typically encourage controlled amounts of carbohydrate and protein after an intensive workout of long duration. Refuel with a handful of nuts, 100 percent fruit juice, crackers, or dry cereal. Low intensity workouts for a short duration may not always require additional nutrients.
It's a good idea to talk with a registered dietitian who is familiar with diabetes management. He or she can help you establish an individualized meal and exercise plan that would include appropriate amounts of snacks to match your nutrient needs.