Allergic to wheat, but not gluten

Through blood tests, my friend learned that she is allergic - not merely
sensitive - to wheat but not gluten. Many books suggest alternatives
(amaranth, buckwheat, millet, montina, quinoa, sorghum, teff, etc). But
without knowing specifically which component of wheat a person is
allergic to, how can one be sure that that component isn't also present
in a "safe" alternative?
.

Relevant Pages

  • Re: OT: To scoff or not to scoff
    ... Spelt is hooded wheat. ... Buckwheat is quite different. ... The insects that were attracted to it ...
    (alt.support.diabetes)
  • Re: Buckwheat
    ... buckwheat isn't a grass, let alone a sort of wheat. ... This is the buckwheat I grow; ... Maybe other plants are known as buckwheat in USA and Canada. ...
    (uk.rec.gardening)
  • Re: Back to Food imports in UPA Raj!
    ... There are various types of cereal grains such as rice, wheat ... millet etc. So I used the pleural. ...
    (soc.culture.indian)