That basic knowledge should be instilled in all children at an early age or they simply won't know when to stop. Children find it difficult to take in moderation, especially when a lot of junk food is specifically designed to be addictive. Peas in the pod are great snacks for kids, in my experience. They're sweet, they are low calorie, and they provide lots of sensory stimulation (chewing, opening the pod etc) which is especially good for autistic children.