Caillou is confused when Emma is allowed to have extra snacks at preschool. He's even more confused when Miss Martin explains that Emma has type 1 diabetes. Caillou is worried about his friend and becomes very protective of her. But when Emma outruns Caillou in a race, he soon realizes Emma's diabetes isn't like a cold or flu. It's something Emma has to live with every day, and she's doing a pretty good job of it.