English subtitles for clip: File:Wie Fasten den Stoffwechsel verändert (CC BY 4.0).webm

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During fasting, our body
uses its energy reserves.

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The metabolism changes within about
twelve hours of the last food intake.

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The brain mainly needs sugar
in the form of glucose.

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To maintain the level
of glucose in the blood,

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the body first activates
its reserves from the liver.

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After about 48 hours,
the sugar stores are empty.

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Then the body switches
to burning proteins.

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This leads to a breakdown
of muscle tissue in the short term.

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The insulin level drops.

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In addition, the body begins to burn fat.

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The fat cells are converted into ketones.

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These supply energy very efficiently
and inhibit further muscle breakdown.

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After a few days of fasting,

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about 90% of the total amount of energy
required comes from fat burning.

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In addition, an important
recycling process is underway.

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Every person has cell waste in his body.

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Fasting increases self-digestion
in the body's cells.

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This so-called autophagy
is a form of cell cleaning

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in which unusable and harmful
cell waste is recycled.

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This gives the body important
new cell building materials and energy.