Nonsense about health and weight prevails on best-seller lists; it prevails on the morning shows; it prevails in the blogosphere. It prevails not because it helps you, the buyers, but because the sellers can sell it. It prevails because false hope is a very profitable business. It doesn't have to be this way.
Zombies are, insofar as I understand their biological classification, undead. They aren't entirely dead, but they certainly aren't fully alive either. That sounds a lot like life with a serious chronic disease. When one's life no longer involves pleasure or the pursuit of interests, it is something of a half-life.
We do indeed have stunning potential control over our health, and should make better use of it. Our feet and forks are, or should be, the master levers of medical destiny. But even the best application of skill-power will not turn weight into a behavior. Weight is not a choice, and we should all choose to recognize that.