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Showing 1–24 of 43 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Dietary composition and energy intake Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Berry Components and Blood Sugar & Fat Metabolism

NCT03458858
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Mixed Berry Diet, Carbohydrate Control Jello, Fiber Enriched Jello, Low Fiber Mixed Berry Juice
Other
Lead sponsor
USDA Beltsville Human Nutrition Research Center
Federal
Eligibility
21 Years to 75 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Beltsville, Maryland
Source: ClinicalTrials.gov public record
Updated May 6, 2019 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of a Wholegrain Diet on Body Composition and Energy Balance

NCT01411540
View directory record Official record
Conditions
Overweight, Obesity, Pre-diabetic
Interventions
Whole grains
Dietary Supplement
Lead sponsor
The Cleveland Clinic
Other
Eligibility
20 Years to 50 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2014
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 9, 2017 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of Energy Imbalance on Food Intake Behaviors

NCT03112161
View directory record Official record
Conditions
Obesity
Interventions
Eucaloric Feeding Period, Overfeeding Feeding Period, Underfeeding Feeding Period
Other
Lead sponsor
University of Colorado, Denver
Other
Eligibility
25 Years to 40 Years
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2015
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Apr 12, 2017 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

The Beneficial Effects of a Protein-rich Breakfast on Appetite Control & Cognition in Overweight and Obese Adolescents

NCT01192100
View directory record Official record
Conditions
Overweight, Obesity
Interventions
Breakfast Skipping, Normal Protein Breakfast Meals, Protein-rich Breakfast Meals
Behavioral
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
15 Years to 20 Years · Female only
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Apr 2, 2020 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Practicality of Intermittent Fasting and Its Effect on Markers of Aging and Oxidative Stress

NCT02132091
View directory record Official record
Conditions
Aging, Metabolism
Interventions
Intermittent Fasting, 400 IU Vitamin E, 1000 mg Vitamin C
Other · Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
19 Years to 30 Years
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Dec 13, 2015 · Synced Sep 29, 2026, 8:39 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Reversal of Lipid-Induced Insulin Resistance

NCT02193295
View directory record Official record
Conditions
Insulin Resistance, NAFLD
Interventions
Caloric Restriction
Behavioral
Lead sponsor
Yale University
Other
Eligibility
18 Years to 90 Years
Enrollment
250 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2002 – 2034
U.S. locations
2
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Jun 21, 2026 · Synced Sep 29, 2026, 8:39 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin Supplementation After Bariatric Surgery

NCT02686905
View directory record Official record
Conditions
Complications of Bariatric Procedures, Avitaminosis
Interventions
Chewable Multivitamin with Iron, PatchMD Vitamin D3/Calcium Patch, PatchMD Multivitamin Patch, PatchMD B12 Energy Plus Patch, Chewable Calcium, Quick Dissolve B12
Dietary Supplement
Lead sponsor
California State Polytechnic University, Pomona
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Brea, California
Source: ClinicalTrials.gov public record
Updated Sep 29, 2016 · Synced Sep 29, 2026, 8:39 AM EDT
Withdrawn Not applicable Interventional

Isoleucine Addition Treatment Effects in a Controlled Diet Study

NCT07329088
View directory record Official record
Conditions
Prediabetes (Insulin Resistance, Impaired Glucose Tolerance), Metabolic Syndrome (MetS), Obesity & Overweight
Interventions
L-Isoleucine, Low-isoleucine diet
Dietary Supplement · Other
Lead sponsor
Jean L. Fry
Other
Eligibility
18 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Apr 14, 2026 · Synced Sep 29, 2026, 8:39 AM EDT
Terminated Not applicable Interventional

Effect of Meal Composition and Timing Modification on Glucose Metabolism, Body Temperature and Sleep

NCT05413928
View directory record Official record
Conditions
PreDiabetes, Type 2 Diabetes, Healthy
Interventions
Time Restrictive Eating- late, Time Restrictive Eating- early, Time Restrictive Eating- early with early caloric intake, Macronutrient-controlled meals
Behavioral · Other
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
29 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Apr 23, 2026 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Exogenous Ketones on Indices of Keto-Adaptation in Obese Subjects on Weight Reducing Diets.

NCT06449287
View directory record Official record
Conditions
Ketogenic Diet, Weight Loss
Interventions
Diet, Blood Draw, Ketone/Glucose Monitoring, Body Composition, Urine Analysis, Neuropsychological Measures - ANAM
Other · Biological · Behavioral
Lead sponsor
Ohio State University
Other
Eligibility
21 Years to 65 Years
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 18, 2024 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional

Moderately Carbohydrate-restricted Diet to Treat NAFLD in Adolescents

NCT05268042
View directory record Official record
Conditions
Non-Alcoholic Fatty Liver Disease, Obesity
Interventions
Moderately carbohydrate-restricted diet, Fat-restricted diet
Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
10 Years to 17 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jul 26, 2026 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Glycemic Load, Metabolism & Obesity in Pregnancy

NCT01287299
View directory record Official record
Conditions
Obesity, Insulin Resistance
Interventions
Low Glycemic Load diet, Low Fat Diet
Other
Lead sponsor
UCSF Benioff Children's Hospital Oakland
Other
Eligibility
18 Years to 40 Years · Female only
Enrollment
64 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2009
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Nov 23, 2020 · Synced Sep 29, 2026, 8:39 AM EDT
Recruiting No phase listed Observational

Diet, Metabolic Health, and Exercise Responses

NCT07728240
View directory record Official record
Conditions
Diet Quality, Metabolic Health, Cognitive Function, Exercise Response
Interventions
Standardized Moderate-Intensity Cycling Session
Behavioral
Lead sponsor
University of Wisconsin, River Falls
Other
Eligibility
18 Years to 60 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
River Falls, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 26, 2026 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional

Feasibility and Preliminary Efficacy of a Reverse Diet as a Novel Weight Loss Maintenance Strategy for Weight-Reduced Adults With Overweight/Obesity

NCT03560635
View directory record Official record
Conditions
Overweight and Obesity, Weight Loss Maintenance, Dietary Habits
Interventions
Weight Loss Maintenance (Control vs. Reverse Diet)
Behavioral
Lead sponsor
University of Colorado, Denver
Other
Eligibility
21 Years to 70 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Apr 18, 2022 · Synced Sep 29, 2026, 8:39 AM EDT
Not yet recruiting Not applicable Interventional

Energy Deficiency on Hormones in Contraceptive Users

NCT07651800
View directory record Official record
Conditions
Energy Deficiency Due to Short-term Fasting, Hormonal Contraception
Interventions
Energy Deficiency of approximately ~250 kcal/day
Behavioral
Lead sponsor
University of Southern California
Other
Eligibility
18 Years to 35 Years · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

UCSD Get Fit, Be Fit Study

NCT03387709
View directory record Official record
Conditions
Overweight and Obesity
Interventions
Pistachio-enriched diet, General dietary guidance diet
Behavioral
Lead sponsor
University of California, San Diego
Other
Eligibility
21 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Mar 23, 2020 · Synced Sep 29, 2026, 8:39 AM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

Impact of Fructose on Metabolism, Energy Homeostasis and Magnetic Resonance Biomarkers in Nonalcoholic Fatty Liver Disease

NCT01930123
View directory record Official record
Conditions
Nonalcoholic Fatty Liver Disease (NAFLD)
Interventions
intravenous fructose challenge, Blood Draw
Drug · Other
Lead sponsor
Manal F Abdelmalek
Other
Eligibility
18 Years to 75 Years
Enrollment
118 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2020
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 30, 2022 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional

Breakfast Intake and Satiety Hormones

NCT02497859
View directory record Official record
Conditions
Obesity
Interventions
Egg Breakfast (EB), Cereal Breakfast (CB), Weight Loss Counseling, Weight Loss Diet
Behavioral
Lead sponsor
Texas Tech University
Other
Eligibility
18 Years to 44 Years · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Sep 15, 2016 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Phase 2 Interventional

Survival TRaining for ENhancing Total Health (STRENGTH)

NCT00068458
View directory record Official record
Conditions
Breast Cancer, Depression, Weight Changes
Interventions
Calcium-Rich Diet, Arm 2: Exercise + Calcium-Rich Diet, Exercise + Fruit & Vegetable, Low Fat + Calcium Diet
Dietary Supplement · Other
Lead sponsor
Duke University
Other
Eligibility
18 Years and older · Female only
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2005
U.S. locations
4
States / cities
Durham, North Carolina • Goldsboro, North Carolina • Winston-Salem, North Carolina + 1 more
Source: ClinicalTrials.gov public record
Updated Dec 18, 2017 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Increased Dietary Protein and Meal Frequency Reduces Total and Abdominal Body Fat During Weight Maintenance and Weight Loss

NCT01749449
View directory record Official record
Conditions
Obesity
Interventions
protein and meal frequency
Other
Lead sponsor
Skidmore College
Other
Eligibility
30 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2007
U.S. locations
1
States / cities
Saratoga Springs, New York
Source: ClinicalTrials.gov public record
Updated Dec 12, 2012 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Dietary Energy Restriction and Metabolic Aging in Humans

NCT00183027
View directory record Official record
Conditions
Obesity
Interventions
Dietary composition and energy intake
Behavioral
Lead sponsor
National Institute on Aging (NIA)
NIH
Eligibility
20 Years to 42 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2002 – 2004
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 8, 2006 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Highly Processed Foods and Vascular Health

NCT05628350
View directory record Official record
Conditions
Cardiovascular Diseases
Interventions
No UPF controlled diet, High UPF controlled diet
Other
Lead sponsor
Virginia Polytechnic Institute and State University
Other
Eligibility
40 Years to 65 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Blacksburg, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 21, 2026 · Synced Sep 29, 2026, 8:39 AM EDT
Not yet recruiting Not applicable Interventional

Ketogenic Approach to Restore Muscle in Older Patients With Community-Acquired Pneumonia - KARMA-P Trial

NCT07308483
View directory record Official record
Conditions
Pneumonia
Interventions
Ketogenic feeding, Standard feeding
Behavioral
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
55 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jun 23, 2026 · Synced Sep 29, 2026, 8:39 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Glycemic Index and Brain Function

NCT01064778
View directory record Official record
Conditions
Obesity
Interventions
Low GI, High GI
Other
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 35 Years · Male only
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
3
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 1, 2012 · Synced Sep 29, 2026, 8:39 AM EDT