A food shortage helped one doctor prove his theory.
https://www.atlasobscura.com/articles/history-of-celiac-disease
“The mortality rate of children in the Netherlands with celiac fell during the food shortage from 35 percent to nearly zero”
https://www.atlasobscura.com/articles/history-of-celiac-disease
The Gluten Free Watchdog had a series of articles last May on this topic. Here’s the 1st: https://www.glutenfreewatchdog.org/news/early-dietary-treatment-for-celiac-disease-the-banana-diet/
The 2nd article includes a 1st person account of being a “banana baby” with several more banana babies adding comments here: https://www.glutenfreewatchdog.org/news/banana-baby-a-former-patient-of-dr-sidney-haas-tells-her-story/
We’ve come a long way.