Jun 21, 2026
As food is no longer entering the system, insulin production decreases. Lower insulin levels encourage the body to start accessing stored energy reserves.
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The liver's glycogen stores provide energy between meals. As fasting continues, these stores gradually become depleted and less available.
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With glycogen reserves falling, the body increasingly relies on fat stores. This shift helps provide energy when glucose availability declines.
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Many people notice hunger arriving in waves rather than continuously. Hormones involved in appetite regulation contribute to these changing sensations.
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The body makes adjustments to support energy balance during fasting. These hormonal changes help manage fuel use and other functions.
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Once the fast ends, the digestive system resumes processing nutrients. The body shifts back toward using incoming food for energy.
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