> [Corn] together with some beans (as native in the Americas) >they make up
an excellent protein with a
> quality like egg (which is 10% better than muscle meat).

it seems the problems with the maiz-bean diet is still all 3 of the usual
problematic amino acids..methionine, lysine, and tryptophan. Here is a link
to a lengthy FAO discussion on this
http://www.fao.org/docrep/T0395E/T0395E0c.htm

and a quote...

The results also served to demonstrate that even with the best
combination-that is, a 7:3 maize-to-beans ratio-the diet is still short of
an adequate quality for small children, and it is even more so when the
proportion of beans is lower.

addition of 10% fish or milk makes a big difference. Mixing vegetabe
proteins to make them complete seems to be another vegetarian myth at least
in the case of children.

andrew