Clinical trial

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

Invitation only · Not applicable · 1 countries · Registry ID NCT07155993

Invitation onlyNot applicableObservational

What this study is about

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.

A promising-looking record is not the same as confirmed eligibility. The study team must review the full criteria and current recruitment status.

Basic eligibility

Age18 Years to 90 Years

SexAll

Healthy volunteersAccepted

ConditionDiabetes (DM), Pre Diabetes, Overweight (BMI > 25)

Full registry criteria

Inclusion Criteria: * Men and women * Fasting for 5+ days at the Buchinger Wilhelmi clinic in Überlingen or Marbella * Age: 18-90 years old * Signed informed consent Exclusion Criteria: * Not able to sign the informed consent * Diagnosed with cachexia, anorexia nervosa, advanced kidney, liver or cerebrovascular insufficiency. * Chronic manifest psychical and psychiatric diseases * Participation in another study * Pregnancy or breastfeeding

Treatments and study arms

The registry does not list a named intervention.

Primary outcomes

Body weightFrom the fasting start until 3 month after fasting

Changes in body weight in the three-month period after a 5+ day fasting period according to the Buchinger Wilhelmi fasting program

Study locations

1 locations were listed when this page was built. The first 40 are shown.

Buchinger Wilhelmi Klinik🇩🇪 Überlingen, Baden-Wurttemberg, Germany

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