I always thought yes, as that's what we've all been taught.
I've just read wheat belly and now I am angry / confused / enlightened ......
In a crux - modern (dwarf) wheat is differs from ancient wheat, it highly addictive, not actually good for us or particularly nutritious and even wholegrain wheat has similar GI to white grain and sugar.
www.amazon.co.uk/Wheat-Belly-Davis-William-MD/dp/1609611543/ref=sr_1_1?ie=UTF8&qid=1329748000&sr=8-1
Has anyone else read this book?