Thanks, I'll take a look at the information you linked to.

I've got the dr. Lindberg "Smartkarbo" book, in which makes the claim I (possibly unprecisely) quoted, and at least there he references at least one major meta study which supports his claim.

On the other side, the Cochrane organization has also published a meta study on the subject, and they didn't come to the exact same conclusion, but if I remember correctly, not to different either.

I write these things off the top of my head, so please take the details with a grain of salt.