Scientists reveal how seven days of fasting transforms the human body
Scientists from Queen Mary University of London found that a seven-day water-only fast triggers significant molecular changes in the human body, most notably after the third day. The study tracked around 3,000 proteins in blood samples and observed widespread shifts affecting metabolism, the brain, and the immune system. These findings suggest the body enters a distinct biological state during prolonged fasting that may offer health benefits beyond weight loss.
- ▪The body switches from burning glucose to fat within the first two to three days of fasting.
- ▪Major changes in protein activity across the body were not observed until after about three days without food.
- ▪Over one third of the measured proteins showed significant changes during the fast, including those linked to the extracellular matrix and brain neurons.
- ▪Participants lost an average of 5.7 kilograms, with most lean tissue regained after refeeding but much of the fat loss maintained.
- ▪The protein changes were highly consistent across participants, indicating a coordinated biological response to prolonged fasting.
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Science News from research organizations Scientists reveal how seven days of fasting transforms the human body Date: May 17, 2026 Source: Queen Mary University of London Summary: Scientists have discovered that the human body undergoes a dramatic internal transformation during extended fasting, with major changes appearing only after about three days without food. In a seven-day water-only fasting study, researchers tracked thousands of proteins in the blood and found widespread shifts affecting organs throughout the body — including the brain. While the body quickly switches from burning glucose to fat, the most intriguing biological changes linked to potential health benefits didn’t emerge until later in the fast.
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