Huge wrote:

There's some good research to show that vitamins break down faster in
microwave ovens than in other cooking methods. Sadly, I can't find it
on Google in among the storm of loons with tinfoil hats on ...

Restricting your search with site:news.bbc.co.uk often cuts down on
the loon factor, and once you're got an author or journal name, you
can follow that up.

http://news.bbc.co.uk/1/hi/health/3188558.stm is, I think, what you
are thinking of.
--
Selah