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Key Points

4 points
1

Body burns stored fat for power.

2

Blood sugar drops, and the brain uses ketones.

3

Heart and muscles adjust to the new fuel.

4

Researchers measured these changes in studies.

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Summary

First, the stomach empties and the body starts using stored fat for energy.

Later, the brain switches to using a special fuel called ketones.

These changes happen in the heart, muscles, and other organs.

Scientists watched these changes in careful experiments.

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New Words to Learn

5 words
prolonged
lasting a long time
systematic
organized and happening in a regular way
organ
a part inside the body like the heart or brain
controlled study
a test where scientists keep things the same except one thing
significant
important or big change
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