Whether the child (or anyone else) has Type I diabetes or Type II diabetes, the diet to follow should be outlined by a dietitian who specializes in diets for diabetics.

Diabetics must eat certain portions of specific types of foods at specific intervals during the day. What they eat may depend on the readings they get when they test their blood sugar levels.

Some Type II diabetics are able to eventually manage their condition with diet alone; but Type I diabetics and many Type II diabetics must take insulin. Some Type II diabetics take oral medication, which works differently than insulin does.

Nobody who knows they are a diabetic - and especially a child - should attempt to construct his own diet plan. Being monitored by a doctor, and following the recommendations of a dietitian (usually recommended by the doctor's office), are critical. The American Diabetes Association offers sound information; but, again, that is not a substitute for regular medical supervision.

There is a lot that a newly diagnosed diabetic needs to learn about how foods affect blood sugar, and particularly, about how insulin is administered and/or regulated.

The Internet is not the place to look for specifics about diet and exercise for diabetics.  It isn't that a writer cannot adequately research general information about a diabetic diet; but, again, regulating blood sugar and insulin levels depends on each person, what he has eaten, how his blood sugar has responded to what he has eaten, and even things like whether he has a cold or other infection.  In general, foods that contain sugars or are easily converted into sugar are the big concern; but again (especially for insulin-dependent diabetics) what to eat is not as simple as saying, "eliminate all sugars". 

While one person can eventually get a general feel for what to eat (once he understands the diabetic diet), how much to eat, and when; and can generally establish a routine that controls blood sugar levels, things like infections or other conditions can affect even a routine that works well most of the time.

Exercise can affect metabolism. Weight gains and losses can affect blood sugar levels as well. If a person takes any other medications, that is yet one more reason to have close medical supervision.

Many Type II diabetics are eventually been able to stop taking medication or insulin injections, once they have followed the correct diet for a while and lost weight. For people with Type II diabetes it is important to realize that following the right diet can sometimes eliminate the need to take insulin.

That "right diet", however, is one that a patient should get from the medical team who is helping him deal with his diabetes and any other medical conditions. The same applies to guidance about exercise.

Diabetes can cause any number of other health problems, and it cannot be stressed enough that all advice should come from a person's personal physician and other health care professionals.