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This is Scientific American 60-Second Health. I'm Sophie Bushwick. Got a minute?

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Light might make you a lightweight, in a good way.

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It's been known that bright light in the morning can reduce appetite and body weight.

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But that fact did not prove that light has a direct effect on weight.

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Early morning exposure to light could just be a marker for a regular sleep cycle,

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which is also associated with a healthy body weight.

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The question was thus whether light exposure was associated with weight regardless of sleep patterns.

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To find out, researchers had 54 adults record their diet and sleep for a week.

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The subjects also wore sensors that monitored the timing and intensity of their light exposure.

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And independent of sleep habits, the participants' body weight corresponded to when they saw the light,

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even dim light, with just half the intensity of sunlight on a cloudy day.

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The study is in the journal PLOS ONE.

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So early to bed and early to rise appears to indeed make you healthy.

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Jury's still out on whether it also makes you wealthy and wise.

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Thanks for the minute, for Scientific American 60-Second Health. I'm Sophie Bushwick.

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