Can Bananas Cure Seliac Disease?

In the 19 twenties, 30% of kids with seliac disease died because they basically wasted away. Some doctors took to trying to cure their patients various ailments with bananas. The idea that you'd go to some random town in portorico, like, ah, the people who eat mostly bananas do not suffer from this disease, and therefore it must cure celiac disease. I feel like, especially in the earlier history of science, people just really ignoring all confounding variables.