Given that there's a large body of work detailing the importance of the gut microbiome, which has effects on everything from cognition to the immune system, it

Given that there's a large body of work detailing the importance of the gut microbiome, which has effects on everything from cognition to the immune system, it wasn't as huge a stretch as it might seem. Perhaps only when you're not aware of the incremental progress so it may seem as a huge leap.