When I read it at andrewsullivan.com, I was skeptical too. But it makes sense. If you are like me, and you’d rather eat a sandwich over installing plumbing, you now have some rationalizations to do so! (Though I’d recommend you do both).
Even if it doesn’t amount to much, like chicken soup, it can’t hurt. And hey, PB&Js (and other veggie sandwiches) are delicious. What’s not to like? See Your PB&J Impact