Trans-fats don't make you fat any quicker than regular animal or vegetable fat. They're bad because they raise the "bad" cholesterols in your blood and decrese the "good" ones which can lead to heart problems in the long run. But as far as calories they're no worse than anything else.

Having said that, if we cut out more trans-fats maybe heart problems would decrease. We spend too damn much in this country on treatments for heart problems. I still don't agree with the gov't telling us what to eat and what not to eat.