What Happens After 20 Hours Without Food? The Science of Fasting
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4 min read
Within the first 24 hours of fasting, the human body undergoes a remarkable metabolic transformation, moving beyond its readily available glucose stores. This critical switch fundamentally changes your body's energy source, making it essential to understand **what happens after 20 hours without food**. As you cross this threshold, your system initiates a sophisticated process to find alternative fuel, leading to profound cellular and hormonal shifts.
