It’s rare for a conversation about nutrition to not include bread at some point. And the context is normally around how healthy / unhealthy it is. Here’s a great video from Dr Rupy Aujla, which summarises it brilliantly. Please don’t throw any bread at people whilst checking out the supermarket shelves though 
(And it case it’s of interest, here’s my favourite bread recipe that I make at home…it’s both delicious and full of amazingness)
https://food52.com/recipes/28886-my-new-roots-life-changing-loaf-of-bread )