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This is Scientific American 60-Second Science. I'm Cynthia Graber. This'll just take a minute.

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When we're stressed out, self-control can flag.

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And so we might, say, reach for a candy bar instead of an apple.

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But California psychologists wondered: what if when we're stressed we fall back on habits, whether good or bad.

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The researchers conducted a battery of tests.

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In one, students rated the strength of their habits regarding breakfast choices and whether they read a section of the newspaper.

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And they reported their actions during stressful exam weeks.

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In another test, MBA students were offered healthful or sugary snacks before or after exams.

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They rated how frequently they usually ate those types of snacks.

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The scientists found that when the subjects' willpower was depleted, they fell back on habits.

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If they usually read a section of the newspaper or ate cereal, they clung to their default during the exams.

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If they usually ate a doughnut, they did so even more frequently when stressed.

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The research is in the Journal of Personality and Social Psychology.

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The finding could mean that if you habitually grab fruit for a snack,

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you'll likely keep doing so, especially, when stressed.

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One less thing to get stressed about.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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