Fasting for five days: scientists track what happens when you stop eating
NCT ID NCT07155993
First seen Jun 26, 2026 · Last updated Jun 26, 2026
Summary
This study follows 300 adults with diabetes, prediabetes, or overweight who fast for at least five days at a clinic. Researchers track changes in weight, blood sugar, and well-being during the fast and for three months after, using questionnaires, continuous glucose monitors, and home blood tests. The goal is to understand how the body adapts to prolonged fasting and the return to normal eating.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- medically supervised long-term fasting (5+ days) followed by structured food reintroduction
- What this could lead to
- If successful, this study could provide practical guidance on how fasting affects metabolism and weight, helping people use fasting safely for health benefits.
- What could go wrong
- This is an observational study, not a treatment trial. Results may not apply to everyone, and fasting can cause side effects like dizziness or nutrient imbalances. The study relies on self-reported data, which can be less reliable.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
Buchinger Wilhelmi Klinik
Überlingen, Baden-Wurttemberg, 88662, Germany
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