Here’s the part that makes this whole thing weirdly personal. Your gut microbiome—the unique mix of bacteria in your belly—dictates how you react to blueberries.
If you’ve got a lot of bacteria that love fermenting fiber and sugar alcohols, you’ll be running for the loo. If your microbiome is more chill, you might just have a slightly softer stool. It’s like a lottery you never asked to play.
When Should You Worry About Black Stool Guide
And no, you can’t “train” your gut to handle blueberries better. Trust me, I’ve tried. I’m now on a first-name basis with my toilet.