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1 .This is Scientific American 60-Second Health. I'm Sophie Bushwick. Got a minute?
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2 .Light might make you a lightweight, in a good way.
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3 .It's been known that bright light in the morning can reduce appetite and body weight.
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4 .But that fact did not prove that light has a direct effect on weight.
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5 .Early morning exposure to light could just be a marker for a regular sleep cycle,
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6 .which is also associated with a healthy body weight.
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7 .The question was thus whether light exposure was associated with weight regardless of sleep patterns.
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8 .To find out, researchers had 54 adults record their diet and sleep for a week.
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9 .The subjects also wore sensors that monitored the timing and intensity of their light exposure.
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10 .And independent of sleep habits, the participants' body weight corresponded to when they saw the light,
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11 .even dim light, with just half the intensity of sunlight on a cloudy day.
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12 .The study is in the journal PLOS ONE.
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13 .So early to bed and early to rise appears to indeed make you healthy.
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14 .Jury's still out on whether it also makes you wealthy and wise.
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15 .Thanks for the minute, for Scientific American 60-Second Health. I'm Sophie Bushwick.
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