From:         Richard Archer <[log in to unmask]>
Subject:      Re: Omega 3 analyses in USDA database inconsistent
At 1:55 -0500 12/1/03, Keith Thomas wrote:

>Walnuts - zero omega 3s

18:3 linolenic is also an omega 3, and walnuts certainly contain that.

 ...R.

Quite right.  I am referring here to 20:5 (EPA) and 22:6 (DHA) which I
have assumed - but have little evidence to support - are the two fatty
acids that writers who speak approvingly of omega 3s are referring to.  I
am thinking in particular of Barry Sears and Loren Cordain who do not
refer to linolenic omega 3s.  Any comment on whether these three are
sufficiently similar to lump them together - or sufficiently different in
their availability and physiological impact to treat them differently?

Keith