You cannot honestly tell me that you feel there is not a single federally-funded program, not mentioned by the Constitution, that is of some benefit.
This is where you have to take a step back and decide if you want the government to have limits or not. The constitution is supposed to be the framework of government, the limits on power.
If it can decide to do things on its own, outside the constitution, without approval of the people's representatives, and without approval of the states, then we have a lawless government.
You might happen to like a certain program, and you might feel like it is beneficial. But will you feel the same way about the next program? And the next one after that? By the time the FDA is banning things you like there will be no room to point to the constitution because the government has already been breaking it for so long.
That's why anything the government tries to do, outside the constitution, should be opposed. Good program, bad program, whatever... it doesn't matter. They are all dangerous because they establish that the government can do whatever it wants -- without your consent.
This is what I was pointing out earlier. Nobody elected the FDA. They are unaffected by your opinions. They can just ban whatever they please... no new law necessary. Maybe you don't like trans-fats, but don't you see the danger in an unaccountable agency with so much power?