Health Unless You Have Celiac Disease, Gluten Insensitivity is Probably in your Head

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By now, you’ve probably heard of gluten-free diets. They’re a necessity for the estimated 2 million Americans with celiac disease. For them, eating gluten can trigger an immune response in their small intestines, damaging the organ’s villi that help absorb nutrients. Excluding the protein from their diets saves celiac disease sufferers from intense bouts of intestinal discomfort and other symptoms.

But for many other Americans, eliminating gluten probably does little to ease their symptoms.

That finding comes from a new study led by Peter Gibson, a professor of gastroenterology at Monash University in Australia. Gibson is the same researcher who published a paper in 2011 that reported gluten sensitivity in non-celiac patients. The results of that paper didn’t sit well with him, so he designed a more rigorous study involving 37 patients who didn’t have celiac disease but reported feeling better when on a gluten-free diet.

Ross Pomeroy, writing at Real Clear Science:

"Subjects would be provided with every single meal for the duration of the trial. Any and all potential dietary triggers for gastrointestinal symptoms would be removed, including lactose (from milk products), certain preservatives like benzoates, propionate, sulfites, and nitrites, and fermentable, poorly absorbed short-chain carbohydrates, also known as FODMAPs. And last, but not least, nine days worth of urine and fecal matter would be collected. [...]

They were first fed a diet low in FODMAPs for two weeks (baseline), then were given one of three diets for a week with either 16 grams per day of added gluten (high-gluten), 2 grams of gluten and 14 grams of whey protein isolate (low-gluten), or 16 grams of whey protein isolate (placebo). Each subject shuffled through every single diet so that they could serve as their own controls, and none ever knew what specific diet he or she was eating. After the main experiment, a second was conducted to ensure that the whey protein placebo was suitable. In this one, 22 of the original subjects shuffled through three different diets — 16 grams of added gluten, 16 grams of added whey protein isolate, or the baseline diet — for three days each."

After the subjects moved off the baseline diet and onto one of the treatment diets, they reported more intestinal pain, bloating, gas, and nausea, regardless of whether the treatment diet was high-gluten, low-gluten, or placebo.

The placebo results were what really stood out to Gibson—patients who received the same diet in the baseline and treatment phases still reported a worsening of symptoms. Gibson says this is a nocebo effect—in other words, it was all in their heads.

 
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