Tacuinum sanitatis casanatense (14th c.)
Wheat is hot and full of profit. Nothing is lacking in it… But, if anyone sifts out the bran from the flour (which is semolina), and then makes bread from that flour, the bread is weaker and more feeble than if it had been made from the proper flour… Whosoever cooks wheat without the entire grain, or wheat not ground in the mill, it is as if he eats another food, for this wheat furnishes neither correct blood nor healthy flesh, but more mucus. It is scarcely digested. It is not at all good for a sick person, even if a healthy person is able to survive on this food… If someone is ailing in his back or loins, cook grains of wheat in water, and place them, warm, over the place where he is ailing. The heat of the wheat will chase away the powers of that disease.
Hildegard of Bingen, Physica (trans. Priscilla Throop)
An advisory from the Medieval Grain Council: white bread will turn you into an ill-blooded mucus-monster. Also, have you tried porridge on your loins?