What nutrient do enriched and whole wheat flours add to yeast breads?

Here's why:

* Enriched Flour: This flour is made from refined wheat flour, which has had most of its nutrients removed during processing. To compensate, it's enriched with added nutrients, including thiamin, niacin, riboflavin, iron, and folic acid (a B vitamin).

* Whole Wheat Flour: This flour is made from the entire wheat kernel, including the bran, germ, and endosperm. It naturally contains B vitamins, along with other essential nutrients like fiber and minerals.

Both enriched and whole wheat flours provide a good source of B vitamins, which are essential for yeast to thrive and ferment properly.