Why We Lose Weight When We Sleep09:39
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(JuditK/Flickr)
(JuditK/Flickr)

Why do we weigh less in the morning than we do at night?

NPR's Robert Krulwich decided to find out and he shares his findings with us.

It turns out that much of it has to do with breathing.

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This segment aired on July 15, 2013.

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