Clinical trial Recruiting at 8 sites Interventional Ages 18 to 70

Using intermittent fasting to enhance insulin secretion in diabetes

Official title: Intermittent Fasting to Improve Insulin Secretion

Run by University Hospital Tuebingen · NCT04607096 · Data updated 2026-11-12

This study is testing if intermittent fasting can help people with prediabetes and type 2 diabetes improve their insulin levels and overall health compared to a regular diet.

Quick facts

Study typeInterventional
Ages18 Years to 70 Years
SexAll
Enrollment200 (estimated)
SponsorUniversity Hospital Tuebingen
Academic / other
Locations8 sites (Berlin and 7 other locations)
StatusRecruiting
StartedApril 8, 2021
Main results expectedDecember 31, 2026
Study endsMarch 1, 2027
Registry record updatedApril 21, 2026
Trial IDNCT04607096 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates for this study are adults with a body mass index between 25 and 40 kg/m² who have prediabetes or recently diagnosed type 2 diabetes.

Probably not a fit

Patients with type 1 diabetes, those on medications affecting glucose metabolism, or individuals with severe medical conditions may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial investigates the effects of intermittent fasting on insulin secretion in individuals with prediabetes and type 2 diabetes. The study aims to determine whether this dietary approach can improve metabolic health and insulin sensitivity compared to a control diet. Participants will be selected based on specific criteria, including body mass index and diabetes status, and will undergo assessments to evaluate the impact of intermittent fasting on their condition. The trial is conducted across multiple prominent institutions in Germany.

Why it matters

Potential benefit: If successful, this approach could provide a sustainable dietary intervention to improve insulin secretion and metabolic health in patients with prediabetes and type 2 diabetes.

How similar studies have gone: Other studies have shown promising results with intermittent fasting in improving metabolic health, suggesting potential success for this approach.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Body mass index (BMI) between 25 - 40 kg/m²
* Understand and voluntarily sign an informed consent document prior to any study related assessments/procedures.
* Subjects with prediabetes (IFG and/or IGT, HbA1c 5,4 % - 6,4 %, subphenotype cluster 3 or 5) or
* Subjects with type 2 diabetes mellitus (diagnosed \<5 years prior to screening), HbA1c 6.0% - 9.5%, not receiving insulin or thiazolidinediones, and with an appropriate washout period for all other antidiabetic medications)

Exclusion Criteria:

* Subjects with diabetes mellitus type 1 (GAD-, IA2-AB positive)
* Women during pregnancy and lactation
* Treamtent with any medication effecting on glucose metabolism like anti-diabetic drugs or steroids
* Subjects with a haemoglobin (Hb) ≤ 11.5 g/dl (for males) and Hb ≤ 10.5 g/dl (for females) at screening
* Any pancreatic disease
* Medical history of cancer and/or treatment for cancer within the last 5 years.
* Known current presence or history of severe neurological or psychiatric diseases, schizophrenia, bipolar disorder
* Known history of bariatric surgery
* Severe liver or kidney diseases (Alanine Aminotransferase (ALT \[SGPT\]), Aspartate Aminotransferase (AST \[SGOT\]) above 3 x upper limit of normal (ULN) or Glomerular Filtration Rate (eGFR) ≤ 60 ml/min (MDRD formula)
* Systemic infection (CRP \> 1 mg/dl)
* Severe diabetic complications like chronic kidney disease (CKD), proliferating retinopathy or symptomatic cardiovascular disease
* Presence of any contraindication for the conduct of an MRI investigation, such as cardiac pacemakers, ferromagnetic haemostatic clips in the central nervous system, metallic splinters in the eye, ferromagnetic or electronically operated active devices like automatic cardioverter defibrillators, cochlear implants, insulin pumps and nerve stimulators, prosthetic heart valves etc.
* Persons with limited temperature sensation and / or elevated sensitivity to warming of the body
* Persons with a hearing disorder or a increased sensitivity for loud noises
* Claustrophobia
* Participation in other clinical trials or observation period of competing trials up to 30 days prior to this study
* Refusal to get informed of unexpected detected pathological findings

Where it's running

  • Charité Berlin - Department of Endocrinology and Metabolic Diseases
    Berlin, Germany
    Recruiting
  • Universtiy Hospital Carl Gustav Carus
    Dresden, Germany
    Recruiting
  • German Diabetes Center
    Düsseldorf, Germany
    Recruiting
  • Heidelberg University Hospital - Department of Endocrinology and Metabolism
    Heidelberg, Germany
    Recruiting
  • University Hospital Leipzig - Clinic for Endocrinology and Nephrology
    Leipzig, Germany
    Recruiting
  • University of Luebeck - Institute of Endocrinology and Diabetes
    Lübeck, Germany
    Recruiting
Show 2 more locations
  • Technical University of Munich - Else Kroener-Fresenius-Center for Nutritional Medicine
    Munich, Germany
    Recruiting
  • University Hospital Tuebingen - Institute for Diabetes Research and Metabolic Diseases (IDM)
    Tübingen, Germany
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.