Caucasians in the study who reported symptoms attributed to lactose intolerance did not pass the hydrogen breath test, suggesting their symptoms may stem from other issues like SIBO.

“It was all the Caucasians that failed the test that said they had symptoms and didn't pass the hydrogen breath test and show that their hydrogen went up, which pretty much parallels lactose intolerances usually in non-Caucasians. So, I'm sort of leading up to this point of they had symptoms, they complained, they attributed it to lactose intolerance, but technically they weren't. Something else was bothering them. Maybe it was small intestinal bacterial overgrowth, the SIBO.”