scientists treated male mice with a technique that mimics the effects of leptin, a hormone that acts
  on the brain to suppress appetite. Treated mice were more likely to approach female mice than their
  food bowls — even if the test rodents had been deprived of food for almost an entire day.

  The paper “addresses a huge gap in the field”, she says. “When you no longer need to eat urgently, it
  should free you up to do other things.”

That's.... the most obvious thing in the entire world. If you're hungry, you can't think about anything but food. If you're not hungry, you can think about things other than food.

We're looking at the next Ig Nobel prize winner, aren't we?