Celiac disease is the most common genetically based food intolerance (1% prevalence among general population) (JAMA 2014, http://buff.ly/1cJWgFy).
Celiac disease, an immune system reaction to gluten in the diet, is four times as common today as it was 50 years ago. Lack of awareness of celiac could be contributing to a delay of up to 11 years in diagnosis of adults in North America (http://goo.gl/sy778).
This is a very informative and beautifully designed video by the University of Chicago Celiac Disease Center. It looks like an infographic made into video - have a look:
New classification is being proposed for gluten-related disorders: celiac disease; dermatitis herpetiformis; gluten ataxia; wheat allergy; gluten sensitivity. WSJ, 2012.
Recent studies support the existence of the new condition nonceliac gluten sensitivity which is defined as symptoms with negative celiac antibodies and biopsy (http://goo.gl/57IlB).
New nomenclature and classification of gluten-related disorders
Algorithm for the differential diagnosis of gluten-related disorders, including celiac disease, gluten sensitivity and wheat allergy. BMC Medicine 2012.
Celiac disease is different from wheat allergy
Disclaimer: I am an Assistant Professor of Medicine and Pediatrics at University of Chicago.