Most conventional nutritional health 'wisdom' is really false. Margarine is not better than butter. In fact margarine should never be eaten. We really aren't smarter than God. Our bodies need good saturated fat.
Please read this article (http://catholiceducation.org/articles/multiculturalism/mu0007.htm) as a follow up on the reaction to the Pope's talk at Regensburg that upset Muslims. This is very important to read and pass on to people who only heard half the story.