This is worth a read.
Whole Health Source: Clarifications About Carbohydrate and Insulin
What matters is cutting out modern foods - grains, legumes, refined oils, preservatives, chemical sweeteners, thickeners, colorings and all that nasty stuff. A potato is just as healthy as a steak. Hell, we've been eating potatoes a lot longer than we've been eating steak! As long as you're eating whole foods, you'll get healthier and lean out regardless of macro breakdowns.