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i'm pretty sure this saying is well agreed upon by the mainstream medical community. (not a medical pro myself, but follow a lot of articles and podcasts from mainstream sources)

Its in most nutrition textbooks, it's partly why fiber is so important.

Eating fiber with any carbohydrates reduces the absorption rate. It's partly why eating an Apple is better for you than eating a lolly despite both being high in sugar.

I think you have to look for "glycemic index" and learn about its mechanisms, which in your defense is not an obvious term to search for.

I’m not sure about that mechanism, but the impact on blood sugar is quantified as “glycemic index” and “glycemic load.”

Serotonigenic microbes digest fiber into feelgood neurotransmitters.

You're welcome.