Bribes work -- when it comes to losing weight, new research shows.
Researchers are reporting success with using cash to help people drop pounds.
Dieters could win or lose $20 a month if they met certain goals.
The diet study involved 100 obese employees at the Mayo Clinic.
One of them picked up nearly $400 by losing 40 pounds during the experiment. She put the money toward a family vacation.
Earning dough for dropping doughnuts is being discussed this weekend at a medical conference in San Francisco.