Read Woody Allen’s send-up of the fake morality in the national diet obsession. It’s "Friedrich Nietzsche’s Diet Book". A quote:

The powerful will always lunch on rich foods, well seasoned with heavy sauces, while the weak peck away at wheat germ and tofu, convinced that their suffering will earn them a reward in an afterlife where grilled lamb chops are all the rage. But if the afterlife is, as I assert, an eternal recurrence of this life, then the meek must dine in perpetuity on low carbs and broiled chicken with the skin removed.

Puritan socialists will point at this as evidence that they really do have a sense of humor about themselves. They indulge Allen because his satire is not a real threat to their moral superiority. In fact, his comedy helps to legitimize socialists’ self-satisfaction. But it still is funny.