Scientists reveal what seven days of fasting does to the human body
New research published in Nature Metabolism reveals that prolonged fasting triggers significant biological changes across multiple organs, with major effects appearing after three days. Scientists hope these findings will help develop medical treatments that mimic the health benefits of fasting.
Why it matters
This research could lead to new therapeutic interventions for conditions like epilepsy and arthritis for patients who cannot safely fast.
Going without food for several days does far more than force the body to burn stored fat. Research published in 2024 found that prolonged fasting produces widespread and coordinated biological changes across multiple organs, with some of the most notable effects appearing only after about three days without calories.
The findings, published in Nature Metabolism , offer an unusually detailed look at how the human body responds during an extended fast. Researchers found evidence of biological effects that went beyond weight loss, although many of the potentially health related changes did not become apparent until participants had gone roughly three days without food.
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