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Showing 1–24 of 392 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Low Calorie Diet Clear all
Completed Not applicable Interventional

Metabolism of Low Carbohydrate and Ketogenic Diet

NCT05071287
View directory record Official record
Conditions
Diabetic Kidney Disease, Cognitive Function, Weight Loss, Diabetic Control, Type2 Diabetes
Interventions
mHealth + low-fat diet, mHealth + low-carb/ketogenic diet
Other
Lead sponsor
The University of Texas Health Science Center at San Antonio
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
2
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Feb 20, 2025 · Synced Sep 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

CALERIE: Comprehensive Assessment of Long-Term Effects of Reducing Intake of Energy

NCT00427193
View directory record Official record
Conditions
Aging
Interventions
Caloric Restriction (CR), Control
Behavioral
Lead sponsor
Duke University
Other
Eligibility
21 Years to 50 Years
Enrollment
238 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2012
U.S. locations
3
States / cities
Baton Rouge, Louisiana • Boston, Massachusetts • St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Mar 15, 2022 · Synced Sep 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM EDT
Terminated Phase 3 Interventional Results available

Effect of Weight and Insulin Sensitivity on Reproductive Function in PCOS

NCT01482286
View directory record Official record
Conditions
Polycystic Ovary Syndrome
Interventions
Metformin, Dietary Restriction, Exercise Training
Drug · Behavioral
Lead sponsor
Pennington Biomedical Research Center
Other
Eligibility
20 Years to 40 Years · Female only
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Baton Rouge, Louisiana
Source: ClinicalTrials.gov public record
Updated Mar 14, 2022 · Synced Sep 2, 2026, 4:04 PM EDT
Completed Phase 2 Interventional Results available

Sex-related Differences in Arterial Stiffness in Type 2 Diabetics: Role of Uric Acid

NCT03648996
View directory record Official record
Conditions
Diabetes Mellitus, Type 2, Hyperuricemia
Interventions
Low-fructose diet, isocaloric, Allopurinol, Placebo, Low-fructose, hypocaloric
Other · Drug
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
40 Years to 75 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 2, 2023 · Synced Sep 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Bitter Taste and Weight Loss in Women

NCT01856660
View directory record Official record
Conditions
Obesity, Weight Loss
Interventions
Low-Carbohydrate Diet, Low-fat Diet
Behavioral
Lead sponsor
Rutgers University
Other
Eligibility
18 Years to 60 Years · Female only
Enrollment
107 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2016
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Aug 23, 2021 · Synced Sep 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Healthy Eating for Reproductive Health (HERHealth)

NCT01509066
View directory record Official record
Conditions
Polycystic Ovarian Syndrome, Infertility, Obesity, Overweight
Interventions
Diet
Other
Lead sponsor
University of South Carolina
Other
Eligibility
18 Years to 35 Years · Female only
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated Apr 17, 2019 · Synced Sep 2, 2026, 4:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

TRE in Type 2 Diabetes (See Food Study 3)

NCT05290246
View directory record Official record
Conditions
Type2Diabetes
Interventions
Time restricted eating, Caloric reduction
Behavioral
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 65 Years
Enrollment
115 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 13, 2026 · Synced Sep 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM EDT
Completed Not applicable Interventional

Comparison of Dietary Sugar Reduction Methods

NCT04186793
View directory record Official record
Conditions
Nonalcoholic Fatty Liver Disease
Interventions
Guided Grocery Shopping (GGS), Diet Provision Group
Behavioral · Other
Lead sponsor
Emory University
Other
Eligibility
8 Years to 16 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
2
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Mar 24, 2022 · Synced Sep 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM 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 2, 2026, 4:04 PM EDT
Recruiting Not applicable Interventional

Ketogenic Diets for Weight Loss Maintenance: Impact on Energy Expenditure and Appetite in Individuals With Obesity

NCT06736028
View directory record Official record
Conditions
Obesity
Interventions
Diet Therapy, Calorie Restriction, Behavioral Support
Behavioral
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Apr 6, 2026 · Synced Sep 2, 2026, 4:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Individualized Lifestyle Intervention for Obesity Management Based on Obesity Phenotypes

NCT04073394
View directory record Official record
Conditions
Obesity
Interventions
Standard Lifestyle Intervention, Modified Lifestyle Intervention
Behavioral
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
215 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 2, 2023 · Synced Sep 2, 2026, 4:04 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Evaluating the Effects of a Diet and Exercise Program in People With Type 2 Diabetes or Prediabetes: (The SHAPE3 Study)

NCT00928005
View directory record Official record
Conditions
Overweight, Obesity, Type 2 Diabetes, Prediabetes
Interventions
Weight loss diet, Weight loss diet plus exercise
Behavioral
Lead sponsor
Johns Hopkins University
Other
Eligibility
30 Years to 65 Years
Enrollment
77 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 3, 2013 · Synced Sep 2, 2026, 4:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Pulse Biomarker Discovery

NCT04887584
View directory record Official record
Conditions
Body Weight
Interventions
Control diet, Low Pulse diet, High Pulse diet
Other
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
18 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Oct 25, 2024 · Synced Sep 2, 2026, 4:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Mediterranean Diet, Weight Loss, and Cognition in Obese Older Adults

NCT03129048
View directory record Official record
Conditions
Cognition, Obese Older Adults, Mediterranean Diet
Interventions
MedDiet
Behavioral
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
55 Years to 85 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 7, 2021 · Synced Sep 2, 2026, 4:04 PM EDT