It's generally accompanied with the admonishment that "fiber" is "better" than RS. Well, I finally got hold of the full-text, all is not as it seems!
The conclusion, as presented in the abstract:
At the end of the study, RS-rich diet failed to affect glycaemic control in prediabetic obese individuals in contrast to the regular fibre-rich diet, which indicated that fibre profile could be an important determinant of the effect of dietary intervention.
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