I like labels. So, labels, yes, Obamacare, no. (Quess I'm just at Quisling at heart)
Labels are exactly the sort of thing the government should be doing: reducing the level of information asymmetry that exists between sellers of food and buyers of food. Consider, without labels, and with an uncooperative manufacturer, a buyer who wanted to know what was in some item of food would have to carry around some sort of assaying equipment in order to find that out. You may laugh, but an individual with a peanut allergy has to be very suspicious of the foods s/he eats because even a little can kill them. That situation would be enormously inefficient - imagine having to carry the equivalent of a testing lab with you every time you go to the supermarket - and also potentially lethal, as many people would simply take their chances, or would act on the (erroneous) belief that they could "just tell" if something was tainted. Before the Food and Drug Act, unscrupulous sellers routinely diluted milk with things like formaldehyde, which is, shall we say, not the most healthy thing to drink; the trouble was, it was very difficult to tell the scrupulous from the unscrupulous ahead of time.
Requiring food manufacturers to disclose the contents - and relevant nutritional makeup - of their products is one of the few areas where government interference produces a net benefit because the additional inefficiency created by the government's activity - such as additional taxes to pay for more gov't workers - is far outweighed by the increased number of market transactions that take place because of the reduction in informational costs.
The problem here is not that gov't is forcing sellers to disclose trans fat, but that it's forcing them to remove it from their products - without anything like the evidence about the deleterious effects of formaldehyde - and that creates a net inefficiency because the costs, direct and indirect, from this gov't action far outweigh the benefits to be gained.
In other words, this is like the difference between the government making sure everyone plays fairly and by the rules, by enforcing those rules, and the government picking the winners and losers without regard to who plays better than whom. Labelling requirements simply enforce the rules needed to maintain a fair and level playing field for buyers and sellers of food products in the free market; banning trans fat is picking winners and losers.