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Can Laughing Give You a Workout?

Researchers measured the hormone levels of volunteers before and after they watched an amusing video clip. They took a special look at ghrelin, which spurs hunger, and leptin, which gives your brain the cue that you are full.

After the clip, hormone levels changed as if the participant had engaged in moderate physical exercise -- ghrelin levels rose and leptin levels fell.

Live Science notes that:

“Although changes in appetite were not directly assessed, by, say, recording what people ate, the finding could help doctors treat patients who are suffering from loss of appetite but are too ill to exercise.”

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