Diet for IBS

Many different dietary modifications have been attempted to improve the symptoms of IBS. Some are effective in certain sub populations. As lactose intolerance and IBS have such similar symptoms a trial of a lactose free diet is often recommended. Fiber supplements have not been found to be effective in the general IBS population. They however might be beneficial in those who have a predominance of constipation.

Definitive determination of dietary issues can be accomplished by testing for the physiological effects of specific foods. The ELISA food allergy panel can identify specific foods to which a patient has a reaction. Other testing can determine if there are nutritional deficiencies secondary to diet that may also play a role. Removal of foods causing IgG immune response as measured using the ELISA food panel has been shown to substantially decrease symptoms of IBS in several studies.

There is no evidence that digestion of food or absorption of nutrients is problematic for those with IBS at rates different from those without IBS. However, the very act of eating or drinking can provoke an overreaction of the gastrocolic response in some patients with IBS due to their heightened visceral sensitivity, and this can lead to abdominal pain, diarrhea, and/or constipation.

Several of the most common dietary triggers are well-established by clinical studies at this point; research has shown that IBS patients are hypersensitive to fats and fructose.

It also appears that some foods are more difficult for the gut as evidenced by elevated food-specific IgG4 antibodies being present, while others increase colonic contractions, which may be painful, due to increased visceral sensitivity in IBS sufferers.

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