I'll combine a couple of your questions:

"If vegetables provide all the nutrients and fiber of grains without the
negative consequences, why not go all the way and remove grains all
together?"

Michelle

> Nevertheless, I want to ask him a semi-challenging question about low carb
> diets. His topic is "Is the USDA Pyramid a Threat to Public Health?" I'm
not
> sure what I want to ask yet, but I don't want it to be too
> aggressive/accusatory, if you know what I mean...just slightly
challenging.
> Something along the lines of...Well if you go this far with the pyramid,
why
> not go all the way and remove grains all together? Or....Given the many
> recent studies in support of low carb dieting, why do you think whole
grains
> are necessary? Or...If vegetables can provide all the nutrients that are
> found in grains.... Or maybe something to do with saturated fat... You get
> the idea.