We learned that when you’re writing an acronym you’re supposed to spell out every word at the beginning. FODMAP...
Gee, I thought everyone on earth knew that FODMAP stands for “fermentable oligosaccharides, disaccharides, monosaccharides, and polyols”. :-)
Yes, of course I had to look it up, and I’ve forgotten it already. I completely agree with you that acronyms should be defined on first use.