I am inherently distrustful of anything that tries to demonize a specific foodstuff or nutrient, without bringing some serious evidence to the table.

For instance, the evidence against trans fats is seriously overwhelming and convincing. The evidence against carbohydrates? Eh, not so much.

Avoid added sugar, don't worry so much about bread (as long as you avoid the stuff with added sugar, obviously) or rice or paste or potatoes.