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Showing 1–24 of 215 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: High calorie diet Clear all
Not listed Not applicable Interventional Accepts healthy volunteers

Pathobiology of Remission of Type 2 Diabetes

NCT03832725
View directory record Official record
Conditions
Newly Diagnosed Type 2 Diabetes, Obese
Interventions
High Protein (HP) weight loss diet, High carbohydrate (HC) weight loss diet
Other
Lead sponsor
University of Tennessee
Other
Eligibility
20 Years to 50 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2024
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Feb 6, 2019 · Synced Sep 3, 2026, 4:20 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 3, 2026, 4:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Small Bowel Microbiota Characterization in Healthy Individuals Before and After Consumption of a Western Diet

NCT03266536
View directory record Official record
Conditions
Small Intestine Bacteria
Interventions
Western diet
Behavioral
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 3, 2022 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Phase 2 Interventional

Reduction of Triglycerides in Women on Hormone Replacement Therapy

NCT00023543
View directory record Official record
Conditions
Cardiovascular Diseases, Atherosclerosis, Postmenopause, Heart Diseases
Interventions
Diet, fat-restricted, Exercise
Behavioral
Lead sponsor
University of Pittsburgh
Other
Eligibility
52 Years to 60 Years · Female only
Enrollment
508 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2010
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 18, 2013 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Not applicable Interventional

BfedBwell Proof-of-Concept Pilot

NCT06191666
View directory record Official record
Conditions
Cancer Survivorship, Obesity, Overweight
Interventions
Group-based education and discussion, Individual 1:1 counseling, Group based behavioral skills development and cooking demonstrations, BfitBwell
Behavioral
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 75 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Feb 10, 2026 · Synced Sep 3, 2026, 4:20 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Metabolic Adaptations to High-fat Diet

NCT06537401
View directory record Official record
Conditions
Adiposity, Insulin Sensitivity, Impaired Glucose Tolerance, Metabolic Disturbance
Interventions
Hypercaloric, High Fat Diet
Behavioral
Lead sponsor
George Washington University
Other
Eligibility
20 Years to 45 Years
Enrollment
2 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Aug 25, 2025 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Preliminary Effect of Food Processing and Sweeteners on Glycemic and Metabolic Measures

NCT05658757
View directory record Official record
Conditions
Blood Sugar; High, Blood Pressure, Dietary Habits
Interventions
Regular sweetened commercial foods, Allulose sweetened commercial foods, Whole and minimally processed and sweetened foods
Other
Lead sponsor
University of California, Irvine
Other
Eligibility
20 Years to 99 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Irvine, California
Source: ClinicalTrials.gov public record
Updated May 2, 2023 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Not applicable Interventional

Calorie Restriction and Brain Function in Mild Cognitive Impairment

NCT03872375
View directory record Official record
Conditions
Mild Cognitive Impairment
Interventions
Meal-Replacement Therapy, Dietary Counseling
Dietary Supplement · Behavioral
Lead sponsor
Iowa State University
Other
Eligibility
70 Years to 85 Years
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
2
States / cities
Ames, Iowa • Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Mar 30, 2022 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

The Personalized Nutrition Study

NCT04145466
View directory record Official record
Conditions
Weight Loss
Interventions
High-fat diet, High-carbohydrate diet
Behavioral
Lead sponsor
Pennington Biomedical Research Center
Other
Eligibility
18 Years to 75 Years
Enrollment
145 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Baton Rouge, Louisiana
Source: ClinicalTrials.gov public record
Updated Jan 29, 2025 · Synced Sep 3, 2026, 4:20 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Complex Effects of Dietary Manipulation on Metabolic Function, Inflammation and Health

NCT02706262
View directory record Official record
Conditions
Obesity, Insulin Resistance
Interventions
Metabolically abnormal obese - Mediterranean diet, Metabolically abnormal obese - Low carbohydrate ketogenic diet, Metabolically abnormal obese - Plant-based, very-low-fat diet, Annual Follow-up Visits
Other · Behavioral
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 55 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2027
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jan 26, 2026 · Synced Sep 3, 2026, 4:20 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Protein and Polycystic Ovary Syndrome (PCOS)

NCT07158723
View directory record Official record
Conditions
Polycystic Ovary Syndrome (PCOS)
Interventions
Higher protein dietary pattern, Calorie restriction
Other
Lead sponsor
University of Arkansas, Fayetteville
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Fayetteville, Arkansas
Source: ClinicalTrials.gov public record
Updated Sep 7, 2025 · Synced Sep 3, 2026, 4:20 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 3, 2026, 4:20 AM EDT
Terminated Not applicable Interventional

Ketogenic Diet With Chemoradiation for Lung Cancer (KETOLUNG)

NCT01419587
View directory record Official record
Conditions
Carcinoma, Non-Small-Cell Lung
Interventions
Ketogenic diet
Dietary Supplement
Lead sponsor
University of Iowa
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jan 7, 2018 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

The Safety and Efficacy of Low and High Carbohydrate Diets

NCT00143936
View directory record Official record
Conditions
Obesity
Interventions
Low- Carbohydrate -Atkins Diet, Low Calorie Diet
Behavioral
Lead sponsor
Temple University
Other
Eligibility
18 Years to 65 Years
Enrollment
360 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2009
U.S. locations
3
States / cities
Denver, Colorado • St Louis, Missouri • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 14, 2010 · Synced Sep 3, 2026, 4:20 AM EDT
Active, not recruiting Not applicable Interventional

Evaluating the Influence of Diet-induced Weight Loss on Fat (Adipose) Tissue's Insulin Sensitivity and Testosterone Synthesis in Women With Overweight or Obesity, Insulin Resistance, and Hyperandrogenemia

NCT06998238
View directory record Official record
Conditions
Overweight and Obesity, Hyperandrogenemia, Insulin Resistance
Interventions
Mediterranean-based, carbohydrate restricted, calorie reduced diet
Behavioral
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
21 Years to 45 Years · Female only
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Mar 16, 2026 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Diet on the Gut-Muscle Axis in Older Adults

NCT05549622
View directory record Official record
Conditions
Sarcopenia, Dietary Exposure, Microbial Colonization
Interventions
Low-soluble fiber diet, High-soluble fiber diet
Other
Lead sponsor
Tufts University
Other
Eligibility
65 Years and older
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 17, 2025 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effects of Inorganic Nitrate and Intensity of Exercise on Cardiovascular Health in Post-Menopausal Females

NCT05221905
View directory record Official record
Conditions
Vascular Dilation, Arterial Stiffness
Interventions
BEET IT - Concentrate Beet root juice, BEET IT - Concentrate Beet root juice (nitrate depleted)
Drug
Lead sponsor
University of Virginia
Other
Eligibility
45 Years to 75 Years · Female only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Nov 29, 2023 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Not applicable Interventional

High Fat Diet II on Weight Loss

NCT00525850
View directory record Official record
Conditions
Obesity
Interventions
high fat diet, low saturated fat diet
Other
Lead sponsor
Christiana Care Health Services
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2010
U.S. locations
1
States / cities
Newark, Delaware
Source: ClinicalTrials.gov public record
Updated Aug 1, 2011 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Phase 2 Interventional Results available

High Fat/High Calorie Trial in Amyotrophic Lateral Sclerosis

NCT00983983
View directory record Official record
Conditions
Amyotrophic Lateral Sclerosis
Interventions
Oxepa, Jevity 1.5, Jevity 1.0
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
13
States / cities
Phoenix, Arizona • Irvine, California • San Francisco, California + 10 more
Source: ClinicalTrials.gov public record
Updated Feb 26, 2015 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Mobile Methods for Reducing Obesity Risk in Parents and Children

NCT03973424
View directory record Official record
Conditions
Overweight and Obesity, Overweight, Obesity
Interventions
Simple, Standard
Behavioral
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
2 Years to 55 Years
Enrollment
144 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 15, 2020 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Diet Intervention for Crohn's Disease Patient

NCT04213729
View directory record Official record
Conditions
Crohn Disease
Interventions
Diet Counseling, CD LFD, Dyadic Psychological Support (DPS)
Behavioral · Other
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 70 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2024
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Feb 28, 2024 · Synced Sep 3, 2026, 4:20 AM EDT
Completed Not applicable Interventional

Measuring Eating, Activity and Strength: Understanding the Response -Using Protein

NCT01715753
View directory record Official record
Conditions
Weight Loss
Interventions
Protein supplementation, Diet counseling and group education lessons
Dietary Supplement · Behavioral
Lead sponsor
Duke University
Other
Eligibility
60 Years and older
Enrollment
71 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Dec 11, 2018 · Synced Sep 3, 2026, 4:20 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Effects of HIIT vs. TRE on Type 2 Diabetes Risk

NCT07215533
View directory record Official record
Conditions
Obesity and Type 2 Diabetes, Metabolic Diseases, High-intensity Interval Training, Time-restricted Eating
Interventions
High-intensity interval training, Time-restricted eating
Behavioral
Lead sponsor
Syracuse University
Other
Eligibility
14 Years to 30 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Syracuse, New York
Source: ClinicalTrials.gov public record
Updated Oct 9, 2025 · Synced Sep 3, 2026, 4:20 AM EDT
Suspended Not applicable Interventional Accepts healthy volunteers

The Effects of a High Protein Breakfast on Appetite and Sleep in Young Adults

NCT03031132
View directory record Official record
Conditions
Appetite and General Nutritional Disorders
Interventions
HP-Beverage Breakfast, HP-Solid Breakfast, Breakfast Skipping
Behavioral
Lead sponsor
Purdue University
Other
Eligibility
20 Years to 32 Years
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated May 18, 2017 · Synced Sep 3, 2026, 4:20 AM EDT