[QUOTE=Sarahfeena]
Telling me that I can’t eat a particular type of food because it is unhealthy for me IS telling me how to live. You may believe that it is telling me to do the RIGHT thing, which it may or may not be, but it is still telling me how to live. Why should I not be able to decide if I want to take the risk of eating these types of foods?
[/QUOTE]
Except “you,” being the public at large (including myself), tends to be uninformed, misinformed, or just plain stupid. If you want to take the risk of, say, buying hats made with mercury, then hey, go ahead. Except that there are probably people who, if it were a little cheaper, would buy mercury hats, because they didn’t believe the hype, didn’t understand it, or just plain didn’t care.
Maybe you believe that dangerous chemicals/additives/materials should be available freely, and that the market should decide what ‘risks’ the public is willing to take and what risks it’s not willing to take, in which case we just have a differing basic philosophy, ya libertarian!!! 
I, though, don’t trust the general public’s (or my own) knowledge and sense of judgment to be able to make good decisions about my health all the time. Decyphering truth from marketing propaganda created by those with vested interests in various products is not an easy thing.
Joe Citizen is probably not going to change his eating habbits because of information about the connection between heart disease and trans-fats. He’s probably not going to stop going to his favorite restaurant because it uses trans-fats in food preparation. Because of this (the fact that people will tend to be self-destructive because of habbit, momentum, or as a way to stick it to the man), it makes sense to me that the gov’t would force restaurants to stop using it. They certainly won’t otherwise, because this new information will most likely not change the number of customers they’ll get.
I can still buy trans-fats at the grocery store if I want it specifically, but the restaurant ban means that when I go to a place where I’m going to order the same food whether or not trans-fat was used in its preparation, I will be getting food that is significantly less likely to cause me to have a heart attack down the road.