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A. An Apple Every Other Day?

Narrator: This is Science Today. You may have heard that eating an apple a day is good for you, but eating an apple every other day may be better. According to University of California, Berkeley nutritionist Marc Hellerstein, mice given 5 percent fewer calories lived longer than a group allowed to eat meals freely.

Hellerstein: There is a remarkable observation in human biology. Which is there is only one thing that can prolong the life span of an animal and that is by restricting their calories.

Narrator: Hellerstein fed the lab mice three times a week and noticed they not only lived longer but diseases like cancer and diabetes were delayed. The next step in the study is to test these findings in humans.

Hellerstein: We're planning to put together a project using these same techniques, and the intermittent fasting model in humans. Because again the nice part about these methods that we developed is they can be used exactly the same in humans, they're safe.

Narrator: For Science Today, I'm Larissa Branin.