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FastForward: A Prospective Analysis of Long-term Fasting and Subsequent Food Reintroduction in Humans

NCT07155993 · Status: ENROLLING_BY_INVITATION · Type: OBSERVATIONAL · Enrollment: 300

Last updated 2025-09-10

No results posted yet for this study

Summary

This study explores what happens in the body and wellbeing during and after a period of long-term fasting. At the Buchinger Wilhelmi Clinic, participants follow a medically supervised fasting program lasting five or more days, followed by a structured food reintroduction phase. The study observes participants over time to better understand how fasting and the return to eating affect weight, metabolism, nutrition habits, and overall well-being.

All participants will complete online questionnaires during the fasting phase and for up to three months afterward. These surveys help track changes in lifestyle, mood, and health. In addition during the first two weeks after fasting ends participants wear a continuous glucose monitor (CGM) to track blood sugar levels in real time, use a mobile app to document meals with photos, and perform simple at-home blood tests using dried blood spot (DBS) kits.

By combining digital tools with personal reports and at home tests, the study aims to gain a clearer picture of how the body adapts after a prolonged fast. The goal is to better understand the short- and medium-term effects of extended fasting on metabolism, diet, and well-being-and to provide practical guidance for those interested in fasting as a health practice.

Conditions

  • Diabetes (DM)
  • Pre Diabetes
  • Overweight (BMI > 25)

Sponsors & Collaborators

  • ETH Zurich

    collaborator OTHER

  • Buchinger Wilhelmi Development & Holding GmbH

    lead OTHER

Eligibility

Min Age
18 Years
Max Age
90 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2024-08-01
Primary Completion
2026-08-31
Completion
2026-12-31

Countries

  • Germany

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07155993 on ClinicalTrials.gov