ouinon wrote:
If this was true, that many people on the spectrum eat "white diets", heavy in carbohydrates and dairy, ( low on fruit, veg, and meat ), it would be another piece of evidence to support the theory that a subset at least, ( a third or more ), of people on the spectrum are being exposed to unusually high amounts of the food opioid peptides in glutenous grains, ( eg. wheat ), and in casein, ( dairy ), because have unusually permeable intestines, ( a very recent study showed that 36.7% of people on the spectrum have unusually permeable intestines compared to 4.8% of the population ), and that as opioids are addictive/habit-forming this causes a subset of us to crave or habitually eat more of these foods than any other, finding food with no opioids in uninteresting even unpalatable.
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There is evidence that lectins - certain types of protein fragments - in wheat cause intestinal permeability, and the same may be true for dairy. In that case the causation would go in the other direction: aspies that started eating significant amounts of these foods would get permeable guts, absorb more opioids, leading to a vicious cycle. Aspieness may make one more likely to go to extremes in these respects.
I used to eat a pretty typical American diet, which included a fair amount of carbohydrate - until two years ago. At that point I switched to a diet that prohibits basically all starchy foods, as well as dairy. I used to have major problems with intestinal gas - likely from intestinal flora taking advantage of undigested carbohydrates - and they went completely away within a month of switching diets.