Chocolate is associated with the release of serotonin, the hormone that makes you feel relaxed, calm, and happy.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
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Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
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