Not quite up to date anymore I'm afraid. In general I agree. There is a major confounder that the best source of fiber are raw vegetables which have other bene

Not quite up to date anymore I'm afraid. In general I agree. There is a major confounder that the best source of fiber are raw vegetables which have other beneficial properties - but most studies of it tended to use something much simpler than actual fiber combinations found in foods. We do not know nearly enough about how diet impacts gut microbiome, nor how the environment does. It is really hard to study anyway.