I agree with what others have said: worry about the blood sugar control, not the nature of the food, which young people want and need to choose for themselves. The great sociologist Bruno Bettelheim once commented that nothing is more important for psychological health than eating with a sense of freedom and joy. Becoming the household food police is going to create problems.
There is a long history of diabetics being punished just for the sake of punishing the freaks of the community who dare to insult the omnipotence of the medical profession by being so darn incurable. Dr. Allan’s starvation clinic in New York for young type 1 diabetics was so hideous in its effects that when Dr. Noorden came from Germany to visit it, he could not force himself to complete the tour of the clinic. Before insulin, diabetics used to be fed donuts made from fried talcum powder and were nourished by food being inserted into the anus. French doctors made diabetics race up and down stairs in order to bring down sugars, but just wound up worsening ketoacidosis. The Cleveland Clinic would not allow diabetics to use insulin even four years after it was developed, because they felt this would just encourage patients to go off their diet. So instead of tolerating this ‘indiscipline,’ they just murdered people. The list goes on, and many details can be found in Michael Bliss’ book on the history of the disease.
When I was first diagnosed in 1966, patients of some doctors at the Joslin Clinic in Boston were not allowed to drink diet soft drinks ‘because it would just keep the desire for sweets alive,’ even though now all doctors allow that with no problems. At my first meal at the clinic I was screamed at for putting salt on my food, since, as I was told, this would cause my urine to burn. We all know now that this was all nonsense, but then the question is, what explains all this delight in punishing the patient, even when there is no rational reason for it? Was it a form of shunning, disciplining, and tormenting the outsider, the ‘scourge of the elephant herd’? Was it a symbolic conquest of death, implicitly corporealized in the person of the patient who cannot be cured? I don’t know, but I have seen this same sort of sadism many times since my diagnosis.