A possible explanation is from Aajonus Vonderplanitz, who wrote that raw 
fish contains an enzyme that we lack. It prevents the living fish from 
being affected by the burden of mercury it carries, should work the same 
for us as long as it lasts in our bodies.
This indicates that you might benefit from a mercury detox.
I used the stuff from http://www.bioraynaturaldetox.com/ and have no 
craving for sashimi.

William



Elizabeth Beasley wrote:
> One thing I should mention is, I crave sashimi just as much as any junk
> food. I swear I could eat it every day. Just raw fish. I do take fish oil
> supplements, so I don't know why I crave it so much! I wish I could afford
> to eat it every day. It really helps cravings, and makes me feel fantastic
> for several hours after I eat it. 
>
> -----------------------------------------------------------------------
>
> Elizabeth,
>
>