Interestingly, although Wheat is thought of as the primary grain that causes a food intolerance, we all can react to different trigger foods, and it may equally be Barley, Rice or Oats, or even a component of Wheat called Gluten that is responsible for individual food sensitivities in the UK.
Manifesting as bloating, Irritable Bowel Syndrome (IBS), weight gain, fatigue, skin problems, migraines or joint pain, even a mild food intolerance to grains and staples may have a major impact upon a person’s day to day activities, and the inclusion of these foods in a western diet is so common that the actual intolerances can be difficult to find, and also to avoid successfully.
Smartblood Story - Matt's Gluten Intolerance