bread

I am trying to illustrate that when you compare two types of the same food, bread vs. bread, then things like GI do become important. Also pointing out that there's really no such thing as 'healthy' bread unless you genuinely need a fast influx of blood-sugar... say post-workout or hypo-glycemic.

Don't eat whole wheat toast thinking it's health food... it's not. It's essentially the first candy humankind ever made for itself and does you about as much good as eating a candy bar. Just because whole wheat is healthier doesn't make it healthy any more than buying low-sodium bacon makes it a health food. Up until modern times when most modern humans had to scrape, hunt, and fight for calories it was one of the best things possible. But when you're trying to go the other direction you need to understand what it really is.

GI is a factor, and there's a lot more to get into with GI, but since this was specifically about bread....

PS - Good buttered toast is one of my favorite foods on earth, which is why I get to eat it after and only after a workout.