[AstroBen]

I wonder if it's due to diet. Endurance athletes love their simple carbs, highly processed gels. I've seen plenty of cyclists taking gummy bears on rides for fuel, or a concoction that is effectively sugar water to drink

The study referenced is really light on details and they don't say if they controlled for that

[xaldir]

I was thinking the same thing.

Simple sugars and highly processed foods tends to affect the gut microbiome.

I guess "more ressearch is needed".