Tim Tyler writes

The brassica toxins normally protect against cancer. They are the reason
broccoli and watercress protect against cancer.

Mustard oil - and especially heated mustard oil - in excess can cause
cancer - e.g.:

http://www.ncbi.nlm.nih.gov/entrez/q...ed&list_uids=1
2693827&dopt=Abstract

...but smaller doses are protective - e.g.:

http://www.ncbi.nlm.nih.gov/entrez/q...ed&list_uids=1
0025884&dopt=Abstract

...and the overall effect of brassica toxins on cancer is overwhelmingly
negative.

The problem with the toxins in mustard and its relatives are usually
gastro-intestinal irritation, thyroid problems and possibly anaemia -
rather than cancer.

Exactly, nasty compounds.

They would be discarded at first screening as pesticides.
Carcinogenic.
Far too toxic.

Although at the correct rate undoubtedly an active insecticide (and
probably mammalicide, too).

--
Oz
This post is worth absolutely nothing and is probably fallacious.
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