RACHEL MARTIN, HOST:
Here's a question - have you ever done a really big workout at the gym, then gone home and gorged yourself on the first unhealthy thing you can find? New research explores why you chose to do that. NPR's social science correspondent, Shankar Vedantam, is here to explain. Shankar, I know none of this.
SHANKAR VEDANTAM, BYLINE: (Laughter).
MARTIN: I've never ever done this - worked out and then pigged out. I mean, this is - I do this constantly. And I feel like I've just worked out, and so why can't I have a double cheeseburger?