As for the french fries:

It is a bit true... but with a big information missing. It's about a year since they brought out this second bit:

The stuff that is carciogenic in the french fries and other such stuff is removed from the body by natural means <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" /> So you would have to eat enough french fries at once to make a difference, for the concentration to be high enough you would have to eat about 1500 kilos of french fries in about 2 days. And if you manage to do that, you have enough other problems <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />