Fasting Clinical Trials

42 recruitingLast updated: June 18, 2026

There are 42 actively recruiting fasting clinical trials across 19 countries. Studies span Not Applicable, Phase 2, Phase 4. Top locations include Boston, Massachusetts, United States, Minneapolis, Minnesota, United States, Baltimore, Maryland, United States. Updated daily from ClinicalTrials.gov.


Fasting Trials at a Glance

42 actively recruiting trials for fasting are listed on ClinicalTrialsFinder across 6 cities in 19 countries. The largest study group is Not Applicable with 28 trials, with the heaviest enrollment activity in Boston, Minneapolis, and Baltimore. Lead sponsors running fasting studies include Massachusetts General Hospital, Boston Children's Hospital, and Ataturk University.

Browse fasting trials by phase

Treatments under study

About Fasting Clinical Trials

Looking for clinical trials for Fasting? There are currently 15 studies actively recruiting participants. Clinical trials offer access to new treatments before they are widely available, and every approved therapy in use today was first tested through a clinical trial.

Below you can browse trials, sign up for alerts when new Fasting trials open, and view eligibility criteria for each study. Each listing includes the study phase, locations, and enrollment details.

Frequently Asked Questions

Common questions about Fasting clinical trials

A clinical trial is a carefully designed research study that tests new medical treatments, drugs, devices, or approaches in human volunteers. Every approved medication and treatment available today was proven safe and effective through clinical trials.

All clinical trials are reviewed and approved by Institutional Review Boards (IRBs) — independent committees that evaluate patient safety. Trials follow strict protocols, and your health is monitored closely throughout. You can withdraw at any time.

Not necessarily. Many trials compare the new treatment against the current standard of care, meaning all participants receive active treatment. When placebos are used, they are typically combined with standard treatment, not given alone. The trial description will always specify the design.

Under the Affordable Care Act, most private insurers are required to cover routine patient care costs during a clinical trial. The sponsor typically covers the investigational treatment itself. Medicare also covers routine costs for qualifying trials.

Yes. Participation is completely voluntary. You can withdraw at any time, for any reason, without it affecting your access to standard medical care.

Each trial has specific eligibility criteria — including age, diagnosis, disease stage, prior treatments, and general health. Browse the trials listed above and check their eligibility sections. You can also contact the trial site directly to discuss your situation.

Showing 120 of 42 trials

Recruiting
Not Applicable

Preoperative Fasting vs. Not Fasting in Critically Ill Patients

Pulmonary aspirationSurgical Procedure, UnspecifiedCritical Illness+1 more
Massachusetts General Hospital1,072 enrolled19 locationsNCT06751043
Recruiting
Phase 2

Take the Reins: The Effects of Nutrient Timing on Cancer-related Fatigue

SurvivorshipNeoplasmsFatigue+3 more
University of Maryland, Baltimore96 enrolled1 locationNCT06482515
Recruiting
Not Applicable

A Study Of Starting Strength Barbell Training

Blood PressureLipid ProfileFasting Glucose
Mayo Clinic200 enrolled1 locationNCT07578285
Recruiting
Not Applicable

The Meta-SHIFT Study: How Metabolic Shift Shapes Human Immunometabolism - a Fasting Trial

Fasting
Cornell University28 enrolled1 locationNCT07527208
Recruiting
Not Applicable

Comparison of Residual Gastric Volume Between Children Who Drink Different Clear Oral Fluid Volume

Gastric emptyingFasting
Boston Children's Hospital288 enrolled1 locationNCT03741777
Recruiting
Not Applicable

Intermittent Fasting to Improve Insulin Secretion

PrediabetesDiabetes type2Intermittent Fasting+1 more
University Hospital Tuebingen200 enrolled8 locationsNCT04607096
Recruiting

The Million Anesthesia Cases Study (MACS) - a Cohort Study of Preoperative Fasting and Perioperative Outcomes

SurgeryAnesthesiaSedation+6 more
Massachusetts General Hospital1,200,000 enrolled1 locationNCT07022951
Recruiting

Gastric Assessment of Pediatric Patients Undergoing Surgery

aspiration pneumoniaDelayed Gastric EmptyingFasting+1 more
Boston Children's Hospital60 enrolled1 locationNCT05674643
Recruiting

Quality Improvement Project to Reduce Preoperative Fasting Times Before Elective Procedures

DeliriumPreoperative FastingPostoperative Nausea and Vomiting (PONV)+2 more
University of Giessen1,000 enrolled1 locationNCT07488468
Recruiting
Not Applicable

Impact of Intermittent Fasting on the Mental Health of Perimenopausal Women

Mental HealthIntermittent FastingPerimenopause
American University of Beirut Medical Center140 enrolled1 locationNCT07481513
Recruiting
Not Applicable

Effect of Fasting on Patient Outcomes After Wide-Awake, Local Anesthesia-only, No Tourniquet (WALANT) Procedures

SurgeryAnesthesia, LocalFasting
University of California, Irvine134 enrolled1 locationNCT05819801
Recruiting
Not Applicable

Effect of a High-Protein, High-Fiber Pre-Fast Meal on Satiety and Glycemic Profiles During Fasting

postprandial glucoseDietary InterventionGlycemic Response; Satiety+1 more
King Faisal University38 enrolled1 locationNCT07447505
Recruiting
Not Applicable

Non-inferiority of Continuing Oral Intake Versus Fasting in Patients With Acute Respiratory Failure

AspirationRespiratory InsufficiencyDysphagia+2 more
University Hospital, Tours754 enrolled14 locationsNCT06510972
Recruiting

"Duration of Preoperative Clear Fluids Fasting in Patients Undergoing Liver Transplant"

Preoperative Clear Fluid FastingLiver Transplant Recipient
Medical University of Warsaw100 enrolled1 locationNCT07288281
Recruiting
Not Applicable

Intermittent Fasting for NAFLD in Adults

Non-Alcoholic Fatty Liver DiseaseFatty LiverLiver Fat+2 more
Massachusetts General Hospital25 enrolled1 locationNCT04899102
Recruiting
Not Applicable

Immunomodulatory Effects of Fasting in Healthy Adults

Fasting
University of California, Davis4 enrolled1 locationNCT05104502
Recruiting
Not Applicable

Evaluating a Fasting-mimicking Diet in Combination With Immunotherapy in Patients With Non-small Cell Lung Cancer

NSCLCImmunotherapyStage IV NSCLC+1 more
VA Office of Research and Development66 enrolled4 locationsNCT06671613
Recruiting

Fastomics: Metabolic and Therapeutic Effects of Prolonged Fasting

Insulin ResistanceFasting
University of Minnesota15 enrolled1 locationNCT07216989
Recruiting
Not Applicable

Effect of Preoperative Oral Carbohydrate Drink on ObsQoR-10 Score After Elective Cesarean Under Neuraxial Anesthesia

Cesarean SectionPreoperative FastingObsQor-10
Ataturk University100 enrolled1 locationNCT07204795
Recruiting

The Impact of Fasting Duration on Quality of Recovery After Cesarean Section

Cesarean SectionQuality ImprovementQuality of Recovery From Anaesthesia+1 more
Jewish General Hospital100 enrolled1 locationNCT06701929