Weight loss · California
Weight loss and obesity studies in California
96 studies have at least one recruiting site in California. Weight-management research includes trials of new medicines, devices, diets and lifestyle programs for people with overweight or obesity, and studies of weight-related conditions such as fatty liver disease.
96 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
More recruiting studies (pay not posted)
- RecruitingHealthy volunteers
Effects of Watermelon or Low-fat Cookie Consumption on Wellness
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteers
The Influence of Chardonnay Marc Intake on Gut and Cardiometabolic Health
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 45–70 · Women only
- RecruitingHealthy volunteers
Milk-Tot Study: Impact of Whole Versus Low-fat Milk on Child Health
University of California, Davis
- Location
- Oakland, CA
- Eligibility basics
- Ages 1–4
- RecruitingHealthy volunteers
A Study to See if an iPhone Weight Management App Can Help Promote Weight Loss in Adolescents and Young Adults After a Stem Cell Transplant
Jonsson Comprehensive Cancer Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 13–30
- RecruitingHealthy volunteers
Prebiotic Effects of California Grapes on Gut Health and Cardiometabolic Health in Overweight Men and Women
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 45–70
- RecruitingHealthy volunteersPhase 2/Phase 3
Single Nuclei RNA-seq to Map Adipose Cellular Populations and Senescent Cells in Older Subjects
Cedars-Sinai Medical Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Fructose Intestinal Gluconeogenesis
Touro University, California
- Location
- Vallejo, CA
- Eligibility basics
- Ages 20–55
- RecruitingHealthy volunteers
The Influence of Honey-flavored Yogurt on Low-grade Inflammation and Gut Health in Middle to Older Aged Women.
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 45–65 · Women only
- RecruitingHealthy volunteers
Behavioral Weight Loss Intervention Utilizing Mobile Health Technology in Hematopoietic Stem Cell Transplant Patients
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 13–30
- RecruitingHealthy volunteers
Effects of Mixed Nut Consumption on Satiety and Weight Management
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteers
Effects of White Button Mushroom on Inflammation in Obese Postmenopausal Women at High Risk of Breast Cancer
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 21+ · Women only
- RecruitingHealthy volunteers
BrainWeighve App Feasibility Study
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 14–21
- RecruitingHealthy volunteers
eMOTION: Examining Implicit Attitudes in Physical Activity Engagement
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Motivational Wellness Coaching to Reduce Childhood Obesity in Families and Kids
Kaiser Permanente
- Location
- Pasadena, CA
- Eligibility basics
- Ages 2–8
- RecruitingHealthy volunteers
eMOTION: Examining Affective Mechanisms in Physical Activity Engagement
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Brown Adipose Tissue Activity in Response to Semaglutide Administered to Obese Subjects.
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Family, Responsibility, Education, Support, and Health for Food Responsiveness
University of California, San Diego
- Location
- La Jolla, CA + 1 other US site
- Eligibility basics
- Ages 7–12
- RecruitingHealthy volunteersPhase 3
Food Prescriptions to Promote Affordable Diets
Kaiser Permanente
- Location
- Pasadena, CA
- Eligibility basics
- Ages 2+
- RecruitingHealthy volunteers
Longitudinal Multi-Omic Profiles to Reveal Mechanisms of Obesity-Mediated Insulin Resistance
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 35–65
- RecruitingHealthy volunteers
Obesity, Insulin Resistance, and PASC: Persistent SARS-CoV-2
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteersPhase 2
Tirzepatide: Reversal of Lipotoxicity and Adipose Tissue Dysfunction in Humans With Overweight/Obesity
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 18–70
- RecruitingHealthy volunteers
Research Framework Exploring Sleep Health
Scripps Translational Science Institute
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
POWERMOM, A Healthy Pregnancy Research Community
Scripps Translational Science Institute
- Location
- La Jolla, CA
- Eligibility basics
- Ages 16+ · Women only
- RecruitingHealthy volunteers
Use of Continuous Glucose Monitors in Children and Adolescents With Obesity
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 10–21
Who these studies look for
Most of these studies set a BMI range and may exclude people taking certain weight-loss medicines or who have had bariatric surgery. Some require a weight-related condition such as type 2 diabetes or high blood pressure.
Matching a page like this one never means you qualify. Each research team decides eligibility at screening.
Questions
Can I join a weight loss study if I already take a GLP-1 medicine?
It depends on the study. Many exclude people currently or recently on weight-loss medicines; others are designed specifically for them. The listing’s eligibility criteria and the study team are the only reliable answer.