Oatmeal is the richest in iron of all the cereals.
With such knowledge, we may alter our diet very greatly without danger of undernutrition.

But we must learn to cook other cereals at least as well as we do wheat.

Without proper cooking they are unpalatable and unwholesome, and they are not so easy to cook as wheat.

They take a longer time and we cannot get the same culinary effects, since with the exception of rye they will not make a light loaf.

Fortunately we are not asked to deny ourselves wheat entirely, only to substitute other cereals for part of it.