Would like to know the answer to that question myself.
Just who are all the people who keep coming up with all this c@@p? Who pays them to meddle in everyone else's business? There are too many of them for all to be independently wealthy. So, someone has to be supporting them. If they were out working to make a living and tending to their own business, they wouldn't have time to worry about whether you and I eat cookies, smoke or may be a little overweight.
Unfortunately, Americans need a good prohibitionist crusade now and again to make us feel that we're holding the fort against the forces of darkness. Just as the prohibitionists tried to blame every social problem on "demon rum," so today everything wrong with our health is due to "obesity" (never mind that our lifespan is longer now than it's ever been.)
There are also plenty of people to go along with the new crusade. Just look at these threads - time and again you hear the same kind of fat- and food-bashing as in these articles.