As promised, here's a bit on mindfulness for kids. According to brain imaging research, practicing mindfulness can alter brain structure in a way that can improve childrens' reaction to stress. It thickens the cerebral cortex, which is responsible for perception and reasoning and increases blood flow in the brain. Additionally, mindfulness helps reduce anxiety and depression. Worth your time, I promise. 

Below are several resources, in no particular order, for you to peruse at your leisure. 

Autoimmune disease and stress: Is there a link?

Association of Stress-Related Disorders With Subsequent Autoimmune Disease

How to Teach Mindfulness to Kids - at any age

The Benefits of Mindfulness Meditation for Teens

10 Mindfulness Activities for Teens

11 Ways to Teach Mindfulness to Kids

51 Mindfulness Exercises for Kids in the Classroom