Wheat, oats, barley, corn

Wheat and it's accompanying gluten are not recommended on a regular basis, especially if you suspect any intolerance.

Oats, when certified gluten free, are fine on Good Carb days and are included in the recipes for Bodyweight Burn System, for example.

Barley and corn, like wheat, are not recommended on a regular basis, but are fine in moderation on good garb days if no intolerance is suspected.