Suggestion for a child 10 years in the field of nutrition?

My eating habbits terrible science niece, and I want to encourage them to do better — instead of coming from a guy, I wonder if there is a simple book written at their level, which describes the strategies of harm reduction and moderation.

Sorry, I did not know a title. I recommend asking the school librarian.

Congressman Ryan Discusses Mindfulness-Based Stress Reduction with HHS Secretary Kathleen Sebelius