A vigorous laugh burns calories (e.g., as many calories per hour as brisk walking or cycling). (Ornstein, Robert, PhD, and David Sobel, MD. Healthy Pleasures. p 217. MA: Addison-Wesley Publishing, 1989.)

Studies at Vanderbilt University: Laughter can speed up your metabolism. Laughing for 10-15 minutes a day can burn up to 50 calories (as many as are in a medium chocolate bar), which amounts to 4.4 pounds a year. The scientists measured participants' energy as they laughed at 10-minute comedy clips versus their resting energy rates. (Leeming, Chris. Laugh Your Way to Leaness.)

Laughter (e.g., the total workout) can use as many calories per hour as are expended in brisk walking. (Sobel, David S., and Robert Ornstein, MD. The Healthy Mind, Healthy Body Handbook. p 49-59. NY: Patient Education Media, Inc., 1996.)

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