M
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Whole grain really means the whole of the grain and the term is permitted as a description as long as the germ, endosperm and bran are contained in the original proportions. When flour is refined only the endosperm part which contains most of the starch is retained. The alleged benefit of whole grain is that most of the vitamins are in the germ part and the bran contains fibre.
See post #11 for context

“I don’t disagree with anything in the article as such, but I think the layperson should be aware that just because something has “whole grains” on the box doesn’t mean it won’t cause a significant glucose response.”