Dan Abel > wrote:

> If you just eat one kind of grain, and no
> other protein, you will develop a protein deficiency, since the
> protein in one kind of grain is not complete.

Agreed. Your diet will be lysine-deficient.

> If you eat rice, beans and corn; that is a complete protein.
> By adding milk to your cereal, that makes the combination a
> complete protein, as the milk supplies what the cereal is low in.

True, but the ratio of milk required is pretty high. 100 grams
of whole-wheat cereal has 13.7 grams of protein, of which
..38 grams is lysine. 100 grams of milk has 3.4 grams of
protein of which .25 grams is lysine. For protein to be
lysine-complete there must be at least 58 milligrams of lysine
per gram of protein. Going through the math you need milk to cereal
in a ratio greater than nine. i.e. a 2-ounce serving of
cereal requires over a pint of milk to be lysine-complete.

Steve