The study found that undiagnosed gluten sensitivity (celiac disease), as measured by a blood test, is four times more common than it was fifty years ago.
The blog’s author (Tara Parker-Pope) speculates that the change “may be due to changes in the way wheat is grown and processed, or the ubiquity of gluten in medications and processed foods.”
I would add that our human ecosystems have seen some pretty serious changes as our food, medicine, and environment have changed. The relationship between gluten sensitivity and intestinal ecology isn’t understood, but I’d be willing to bet it’s significant.
I want to see the results of the Human Microbiome Project!