Weight loss is hardly a laughing matter here in the Obese Nation, where two-thirds of adults are overweight or worse. But the newest aha! breakthrough in the battle of the bulge just might prompt a snicker - and maybe make you healthier.

One can lose weight by laughing. No joke! Instead of yo-yo dieting, try ho-ho dieting. Scientists have found that a good laugh is a calorie burner not to be ignored.