I received an email with a straightforward question that I may never have answered as compactly.
Steve, I am wondering if a person who gets diarrhea from being lactose intolerant would get diarrhea from other foods more readily than if you weren't LI?
So here's the short answer.
No, there is no connection between LI and other diarrhea-causing problems.
However, some diseases, like irritable bowel syndrome, may be triggered by milk and also by other foods. That's a different mechanism than LI, however.