let's bring in dr. nina radcliffe, a private practice md. why now? >> well, it's time for us to say our fond farewells to margarine. the not butter which was once considered the healthy alternative is now on life support and we're about to pull the plug. not only do they not improve our health but they're harmful for our health. >> a lot of people were frustrated about this. they're saying the government should stay out of their business inclouding telling people what to eat and what they shouldn't eat. are they right? >> we always play the seesaw between personal freedom as well as public health. we're going back and forth with this. what to eat what to drink, what to smoke. actually mcdonald's, kfc, as well as taco bell have already stopped using transfats. we're also seeing cisco, one of the largest industries, is already starting pulling out the transfats. >> what do transfats do? >> they're actually hydrogen added to liquid oils. the reason they do this is so we can add texture as well as taste