Editing Food intolerance (section)

==Epidemiology==
Estimates of the prevalence of food intolerance vary widely from 2% to over 20% of the population.<ref name="pmid18584930">
{{cite journal |vauthors=Nelson M, Ogden J |title=An exploration of food intolerance in the primary care setting: the general practitioner's experience |journal=Soc Sci Med |volume=67 |issue=6 |pages=1038–45 |date=September 2008 |pmid=18584930 |doi=10.1016/j.socscimed.2008.05.025 |url=http://epubs.surrey.ac.uk/732548/1/Ogden%202008%20An%20exploration%20of%20food%20intolerance%20%20miaGP.pdf}}</ref> So far only three prevalence studies in Dutch and English adults have been based on double-blind, placebo-controlled food challenges. The reported prevalences of food allergy/intolerance (by questionnaires) were 12% to 19%, whereas the confirmed prevalences varied from 0.8% to 2.4%. For intolerance to food additives the prevalence varied between 0.01 and 0.23%.<ref name="pmid8693302">
{{cite journal |author=Wüthrich B |title=[Food allergy: definition, diagnosis, epidemiology, clinical aspects] |language=de |journal=Schweiz Med Wochenschr |volume=126 |issue=18 |pages=770–6 |date=May 1996 |pmid=8693302 }}</ref>

Food intolerance rates were found to be similar in the population in Norway. Out of 4,622 subjects with adequately filled-in questionnaires, 84 were included in the study (1.8%) Perceived food intolerance is a common problem with significant nutritional consequences in a population with IBS. Of these 59 (70%) had symptoms related to intake of food, 62% limited or excluded food items from the diet.
Tests were performed for food allergy and malabsorption, but not for intolerance. There were no associations between the tests for food allergy and malabsorption and perceived food intolerance, among those with IBS. Perceived food intolerance was unrelated to musculoskeletal pain and mood disorders.<ref name="pmid16391571">
{{cite journal |vauthors=Monsbakken KW, Vandvik PO, Farup PG |title=Perceived food intolerance in subjects with irritable bowel syndrome-- etiology, prevalence and consequences |journal=Eur J Clin Nutr |volume=60 |issue=5 |pages=667–72 |date=May 2006 |pmid=16391571 |doi=10.1038/sj.ejcn.1602367 |s2cid=6382678 |doi-access= }}</ref>

According to the RACP working group, "Though not considered a "cause" of CFS, some patients with chronic fatigue report food intolerances that can exacerbate symptoms."<ref name="pmid12056987">{{cite journal |title=Chronic fatigue syndrome. Clinical practice guidelines&mdash;2002 |journal=Med. J. Aust. |volume=176 Suppl |issue= S9|pages=S23–56 |date=May 2002 |pmid=12056987 |author1= Working Group of the Royal Australasian College of Physicians}}</ref>