I've been researching (okay, just Googling; I guess there's a difference) the role of saturated fat in heart disease. It seems to me that the federal food pyramid and even groups like the American Heart Association are way behind the times.
There's lots of interesting stuff out there, but the take-home message, which is so counterintuitive that a lot of people simply can't accept it, is that fat does not make you fat. See also this, this, and this.
(Don't ask me how I became a primal eating evangelist. I'm not sure myself.)
But I'm suddenly wondering why federal guidelines haven't changed to reflect the evidence. Is there actually a sinister wheat-and-corn lobby at work?