If you suffer from a condition such as osteoporosis, Crohn's disease, rheumatoid arthritis or depression, you're unlikely to blame your breakfast cereal. After all, intolerance of wheat, or celiac disease (CD), is a an allergic reaction to a protein called gluten, thought to affect only about one in 1,000 people. But now two American clinicians, James Braly and Ron Hoggan, have published a book, Dangerous Grains, claiming that what was thought to be a relatively rare condition may be more widespread than was previously thought. Braly and Hoggan suggest that gluten intolerance does not just affect a few people with CD, but as much as 2-3% of the population.