http://www.livestrong.com/article/42173 ... tolerance/
Approximately 3 million Americans, 1 in every 133 people, has celiac disease, reports the National Foundation for Celiac Awareness. Dr. William Sears notes that approximately 3 percent to 7 percent of people experience true food allergies, 90 percent of which are caused by just seven foods: soy, shellfish, wheat, tree nuts, peanuts and egg whites. The exact number caused by wheat is unknown.
While gluten intolerance and wheat allergy are different conditions, people who suffer from either of these conditions must avoid wheat altogether. Anything listing whole wheat, spelt, triticale, bulgar, semolina, frumento, durum, graham, farina, cous cous, seitan, matzoh and cake flour should be avoided by those with wheat allergies and those with gluten intolerance. While foods labeled as gluten-free are safe for both conditions, products labeled as wheat-free may still contain gluten and should be carefully researched before being consumed by celiac patients.http://www.alternativementalhealth.com/ ... ergies.htm
Just because "wheat has been a major source of sustenance for countless millions for hundreds of years" doesn't mean it wasn't a problem for some of them. Nutrition science is new. Connections between wheat and illness would have been easily missed. Stop and think about it for a second. During some periods of history, in cases of mental health, illness was often attributed to the devil.
It's possible that breastfeeding, or rather the reduction of breastfeeding in modern society, may be a factor in the increase of allergy and intolerance. Less immunity.