Also got purple first today.
I have no idea what FODMAP means.
The F is for fermentable and then each other letter is a different category of short-chain carb (sugar). And then there are subcategories (e.g., lactose is under the disaccharides umbrella). Apparently many (most?) people actually only have problems with one or two of the categories or subcategories and this book helps you figure out which ones since it is not intuitive at all which foods might fall in which categories (and there are a lot of bad lists out there). Like, most nuts are low FODMAP but cashews and pistachios are high while almonds are only high if eaten in certain quantities.
Maybe I should learn. ETA my library does not have that book but I have been requesting things like mad and it seems like they then get them more often than I expected, so I'll try that with this....
I mean, if you like rabbit holes... sure. I only got the book because the author is a guest on one of the nutrition podcasts I listen to. But it was sort of fascinating in that, while I didn't have major issues to resolve, and didn't do the elimination part at all, I did end up thinking it explained minor issues I had noticed over the years.