A new study has uncovered how extended fasting dramatically reshapes the human body from the inside out. Researchers monitored thousands of blood proteins during a seven-day water-only fast and discovered major biological changes affecting multiple organs, including the brain. The body switched from burning glucose to fat within the first few days, but the most interesting transformations linked to possible health benefits appeared only after around three days without food. Scientists observed widespread shifts in proteins connected to metabolism, inflammation, and cellular repair. The findings suggest that prolonged fasting may trigger deeper biological processes than previously understood, opening new avenues for studying metabolism, aging, and disease prevention.
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