One of the most important rules when thinking about healthy eating is that, you should mind the food you eat, try eating natural food which has not been processed (examples include different types of twinkies, etc.). Natural food which involves eating meat, vegetables, fruit, rice, etc. is what should be strived towards.
It's also important to understand that you have to balance between eating what is good for you and also what you like to eat :)
Type I Diabetes Mellitus or as specified "Juvenile Diabetes" Is a somewhat uncommon form of diabetes which results as the inability to produce insulin, which is needed to process glucose. Many believe this type of diabetes is caused by adverse immune reaction that results in the body attacking the Beta cells of the pancreas which insulin is produced from. The condition is chronic, and requires insulin to mantain.
Dietary supplement is your answer :) Hope this helps!
