Comment by d-us-vb

He's talking about "wonder bread" and other factory breads that have had much of their nutrients stripped and some put back, to the detriment of their absorption. Some also are concerned with artificially included preservatives and the unknown unknowns of putting them in places (even if there's a common natural source in another food).

Homemade bread is certainly not ultraprocessed (especially if made with unbleached flour or even better, whole wheat flour), but factory bread most certainly is considered ultraprocessed.