Authentic sourdough bread made from fermented whole grains is a great choice. It can be tricky to find in stores sometimes, so your best bet is a bakery. The fermentation process breaks down antinutrients in the grains, making them easier for your body to absorb. If the ingredients list includes "enriched" before the type of flour, it's not ideal. A good sourdough should have no more than three ingredients, unless it includes various grains, seeds, nuts, herbs, etc.