Here's a great site I used when I babysat my cousin last summer! This will teach you all the basics on what good and not as well as some general (useful) information, if you click on "The Basics of Healthy Eating" it will teach you how to build a healthy (safe) meal :)
www.kraftcanada.com/en/healthy-living-ideas/Diabetes/Diabete
www.kraftcanada.com/en/healthy-living-ideas/Diabetes/Diabete