Check with your dietician about adding more fat to your son's diet to hold off the hungries. Also, I was part of a diabetic test group for Kelloggs Cereals at Michigan State University and we had some really awesome results in our blood sugar readings and management.
The test was to check the effectiveness of added fiber, specifically psyllium (can't spell it!) to the diet and it's effects on blood sugar management. I didn't understand all the ins and outs of the result data but the bottom line was psyllium taken after a starchy meal (or in the cereal that we tested) levels out blood sugar readings for about 3-6 hours. It doesn't restrict the absorption of the calories... just slows their getting into the blood stream so the blood sugar doesn't peak so high.
They were very excited about the results and mentioned that psyllium fiber may be added to a cereal in the future aimed at the diabetic population. They also mentioned that it could be added to pasta's (usually a diabetic no-no
) in the future to help diabetics with that as well.
As a result of the testing I have added psyllium to my diabetes management after any meal where I think I may have gone overboard on the starches. I disolve 1 heaping tablespoon in 1/2 glass of warm water and chug it down. I follow it with a glass of cool water. I buy my fiber at the dollar store after I found it contained the same ingredients as the big $13.00 can at the drug store.
You may want to discuss this option with your doctor and see if you son is willing to try it. The psyllium also helps with a full feeling so he may not want to eat as often. Hope this helps.
By the way, the study was at MSU and was under the Food Science & Human Nutrition, Human Ecol, Dept. It was in 2002 and was called the Type 2 Diabetes and Psyllium Study sponsored by Kelloggs.
"As one goes through life one learns if you don't paddle your own canoe you don't move."