Diet Clinical Trials

221 recruitingLast updated: June 18, 2026

There are 221 actively recruiting diet clinical trials across 45 countries. Studies span Not Applicable, Phase 2, Phase 3, Phase 1, Phase 4. Top locations include New York, New York, United States, Chicago, Illinois, United States, Boston, Massachusetts, United States. Updated daily from ClinicalTrials.gov.


Diet Trials at a Glance

221 actively recruiting trials for diet are listed on ClinicalTrialsFinder across 6 cities in 45 countries. The largest study group is Not Applicable with 156 trials, with the heaviest enrollment activity in New York, Chicago, and Boston. Lead sponsors running diet studies include University of British Columbia, University of California, Davis, and Brigham and Women's Hospital.

Browse diet trials by phase

Treatments under study

About Diet Clinical Trials

Looking for clinical trials for Diet? There are currently 20 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 Diet 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 Diet 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 221 trials

Recruiting
Phase 1

Developing Biomarkers of Dietary Intake: Dose Dependent Measurement of Sugar Intake

Healthy VolunteersDiet Therapy
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)60 enrolled1 locationNCT04799301
Recruiting

Longitudinal Measurements of Visual Diet in Children

MyopiaVisual DietPupil+5 more
State University of New York College of Optometry60 enrolled1 locationNCT07642999
Recruiting
Not Applicable

Randomized Evaluation of Voucher Interventions for Value and Effectiveness (REVIVE) in Philippines

Nutrition knowledgeUndernutritionFood Insecurity+1 more
International Food Policy Research Institute5,320 enrolled1 locationNCT07640594
Recruiting
Not Applicable

Early Childhood Dietary Assessment Study

Dietary Assessment
The University of Tennessee, Knoxville40 enrolled1 locationNCT07227272
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

Dietary Behavior Intervention in African Americans at Risk for Cardiovascular Disease

DietCooking
National Institutes of Health Clinical Center (CC)55 enrolled1 locationNCT04305431
Recruiting
Not Applicable

Nutrition for Precision Health, Powered by the All of Us

NutritionDietary HabitsHealth
RTI International8,000 enrolled14 locationsNCT05701657
Recruiting
Not Applicable

The Effect of Low or High Dietary Fiber Diet on Volatile Organic Compounds in Exhaled Breath of Healthy Individuals

Healthy AdultsDietary Fiber Fermentation
Örebro University, Sweden20 enrolled1 locationNCT07594600
Recruiting
Not Applicable

Integrating Food Rx With Best Feeding Practices With EFNEP

Food SelectionChildhood ObesityDietary Habits+1 more
Baylor College of Medicine375 enrolled1 locationNCT05881759
Recruiting
Not Applicable

Investigating the Effects of Beef Consumption on Cognitive and Brain Health

Dietary ProteinsDietary InterventionCognitive Ability, General+1 more
University of Nebraska Lincoln240 enrolled1 locationNCT06690892
Recruiting
Not Applicable

Support Your Heart, Phase 1

Diet, HealthySleepPhysical Activity+3 more
George Washington University20 enrolled1 locationNCT07623733
Recruiting
Not Applicable

Assessing User Satisfaction and Adherence to an Abbreviated Dietary Tracking App (MySnackTracker) Versus Full-intake Dietary Monitoring

Dietary Monitoring
M.D. Anderson Cancer Center90 enrolled1 locationNCT06919471
Recruiting

Natural History and Genetics of Food Allergy and Related Conditions

eosinophilic esophagitisAtopic DermatitisFood allergy+1 more
National Institute of Allergy and Infectious Diseases (NIAID)1,800 enrolled1 locationNCT02504853
Recruiting

Maternal Methyl-Nutrient Status and Infant Neurodevelopment Study

PregnancyNutritionDietary Quality+6 more
Far Eastern Memorial Hospital240 enrolled2 locationsNCT07568561
Recruiting
Not Applicable

Regular Diet After Colorectal Surgery

Post-operative careSurgeryColorectal+1 more
Weill Medical College of Cornell University10 enrolled1 locationNCT07540845
Recruiting
Not Applicable

Testing Ultra-processed Warning Labels in United States

DietNutrition LabelingConsumer Behavior
Johns Hopkins Bloomberg School of Public Health7,000 enrolled1 locationNCT07533877
Recruiting
Not Applicable

Effects of Ketogenic Diet on Alcohol Intoxication

Magnetic Resonance ImagingAlcohol DrinkingAlcohol Use Disorder+2 more
University of Pennsylvania20 enrolled1 locationNCT07602270
Recruiting
Not Applicable

Evaluation of Oral Collagen Peptides on Skin Barrier Function in Women

Dry skinDietary SupplementSensitive Skin+1 more
Centre de Pharmacologie Clinique Applique a la Dermatologie75 enrolled1 locationNCT07529249
Recruiting
Phase 3

Ketogenic Diet for New-Onset Absence Epilepsy

Ketogenic DietingEpilepsy, Absenceabsence epilepsy
Johns Hopkins University40 enrolled1 locationNCT04274179
Recruiting

National Network for Cardiovascular Genomics: Advancing Cardiovascular Healthcare for Hereditary Diseases in Brazil's Unified Health System Through a Multicenter Registry

Sudden Cardiac DeathArrhythmogenic Right Ventricular DysplasiaCardiomyopathy, Dilated+11 more
Hospital do Coracao1,211 enrolled27 locationsNCT06546137