Gut Bacteria & Diabetes

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Here's a study which says more fibre helps with diabetes by reintroducing certain gut bacteria and short chain fatty acids, but this paragraph puts a shadow of doubt in my mind

The experimental diet also included prebiotics, which encourage the growth of gut bacteria that make short-chain fatty acids. Both groups were controlling blood sugar with the help of a drug called acarbose.

https://www.medicalnewstoday.com/articles/321150.php