I think the best diet is the one you can stick with. For veggie lovers, a vegetarian or vegan diet may be the way to go; but if you hate them, like I do, a low-carb diet may work better. Which is not to say that I don’t force myself to eat veggies, but I couldn’t deal with a diet of lots of veggies, limited starch and limited protein, as shown in the Power Plate.
By limiting my carbs to 60-75 a day, I have lost 22 lb. by the doctor’s scale, and my lipid numbers are the best I’ve EVER had. Even the VLDL, which has never been in the normal range for me, came out at 34 on a range of 0-40. And I’m just not hungry. If I eat veggies and starch, I’m hungry an hour later (Chinese Restaurant Syndrome), but if I eat protein and fat, I stay comfortable for up to 6 hours. And my BGs are more stable than they’ve ever been.
For children, however, you have to think differently, because they need energy to grow, and can’t eat all that much. Plus, their needs are constantly changing, and adolescence can be a nightmare. I don’t have any advice on that because I never raised a diabetic child, but I think caution and careful research are the keys here. And a good pediatric endo, who knows about what children need for growth and health!