Here are a few of the down sides of gluten:

1. It may block your body's absorption of some nutrients

2. It may interfere with your digestion

3. It contains certain enzymes or properties that may cause the lining of your intestines to become more permeable.
4. It may cause inflammation in your system

Jon tries to avoid gluten for these reasons. 

Disclaimer: The Gabriel Method is not intended to treat, cure, or prevent any disease or illness. This information is intended for educational purposes only, not as medical advice. Always check with your doctor before changing your diet, eating, or health program.