As reported by CBS news, the study pinpoints ghrelin, the "hunger hormone," as being the culprit in high-calorie cravings. The study showed two sets of participants pictures of high- and low-calorie food over the course of three mornings. Group One had eaten breakfast that morning; Group Two had skipped breakfast and its participants were injected with ghrelin. Group Two had cravings for chocolate, cake, and pizza. Group One didn't.
Tony Goldstone, the study's lead author, said this finding "raises the possibility that drugs that block the action of ghrelin may help reduce cravings for high-calorie food and so help people lose weight."
And all this time we thought we had to exercise.