>Question though...aren't rats REALLY different compared to
>humans? Who's to say rats respond the say way as humans? Can
>anyone clarify that one?
Good question. Rats have often been used in studies which are then extrapolated to humans (because you can observe several generations of rats in a rather short time), but... Thalidomide had no adverse effects on rats, but caused birth defects in humans, and researchers long thought that no plant foods contained complete proteins (capable of sustaining human life if used as the sole source of protein), until they realized that rats need more of one type of amino acids than humans do.
So I'd say "humans are not rats.";-)