Effects of Tirzepatide Plus Intensive Lifestyle Therapy on Body Weight and Metabolic Health in Latinos With Obesity

Washington University School of Medicine

Overview

The purpose of this study is to conduct a three-arm 52-week, randomized controlled trial with double blind treatment to evaluate the effects of a drug called tirzepatide in combination with an innovative, culturally-appropriate, intensive lifestyle intervention (ILI) delivered by community health workers (CHWs) in Latino adults with obesity. Participants will be randomized to 1) standard care (SC, n=25); 2) culturally-tailored dietary and behavioral intensive lifestyle intervention (ILI, n=25) provided by CHWs plus placebo; or 3) ILI plus tirzepatide (ILI-TRZ) for 52 weeks to evaluate the intervention's effect on: i) weight loss; ii) clinical efficacy (change in body fat mass, liver fat, intra-abdominal fat mass and intrahepatic triglyceride content, oral glucose tolerance, glycemic control, insulin sensitivity and b-cell function, plasma lipids, blood pressure, sleep duration, quality and behaviors, physical performance scores); iii) adherence and fidelity to the intervention (adherence to the intervention and barriers to long term adherence, quality-of-life, fidelity of the implementation by CHWs, CHW's and study participants' acceptability and satisfaction with the intervention and eating behaviors. Placebo or tirzepatide will be injected subcutaneously in the abdomen or thigh once a week for 12 months.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

TRIPLE

Conditions

Obesity Metabolic Disease

Standard CareBEHAVIORAL

Participants will meet with community health workers to receive general health information through individual check-ins.

Culturally-tailored dietary and behavioral intensive lifestyle interventionBEHAVIORAL

Participants will meet with community health workers to receive information focused on healthy eating while still adhering to a culturally-tailored plant-forward diet.

PlaceboDRUG

Participants will receive placebo subcutaneous injections.

TirzepatideDRUG

Participants will receive subcutaneous injections of tirzepatide that gradually increase up to 15 mg per week.

Eligibility

Sex: ALLMin age: 21 YearsMax age: 65 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Self-reported Hispanic and/or Latino heritage * Body Mass Index (BMI) 30-42 kg/m² * HbA1c ≤ 6.4% Exclusion Criteria: * Previous diagnosis of diabetes or fasting glucose ≥ 126 mg/dl or 2 hr oral glucose tolerance test plasma glucose ≥ 200 mg/dl * Unstable weight (≥4% during the last 2 months prior to study enrollment) * CPAP treatment for obstructive sleep apnea * Severe cardiovascular disease within the 6 months prior to study enrollment * Severe organ system dysfunction * Known clinically significant gastric emptying abnormality * History of chronic or acute pancreatitis * Thyroid-stimulating hormone (TSH) \>1.5X the upper limit of normal * Medical conditions that cause obesity * History of significantly active or unstable Major Depressive Disorder or other severe psychiatric disorder within the last 2 months * Active substance abuse with alcohol or drugs * Uncontrolled hypertension * Liver disease * Calcitonin level of ≥20 ng/L if eGFR ≥60 mL/min/1.73 m2 or ≥35 ng/L if eGFR \<60 mL/min/1.73 m2 * Family or personal history of medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2 * History of active or untreated malignancy or are in remission from a clinically significant malignancy (other than basal- or squamous cell skin cancer, in situ carcinomas of the cervix, or in situ prostate cancer) for less than 5 years * Severe anemia * Pregnant or breastfeeding * Metal implants that preclude MRI testing * Use of medications that are known to affect the study outcome measures * Do not agree to use contraception throughout the study period in male and female participants of reproductive and childbearing age * Persons who are not able to grant voluntary informed consent * Unable or unwilling to follow the study protocol * Have any other condition not listed in this section (e.g. hypersensitivity or intolerance) that is a contraindication of GLP-1R agonists

Locations (1)

Sansum Diabetes Research Institute

Santa Barbara, California, United States

Outcomes

Primary Outcomes

Change in body weight

Percent change in body weight

Time frame: After 24 weeks of intervention

Change in body weight

Percent change in body weight

Time frame: After 52 weeks of intervention

Secondary Outcomes

Proportion of participants losing at least 5% in body weight

Proportion of participants in each group that lose at least 5% in body weight

Time frame: After 24 weeks of intervention

Proportion of participants losing at least 5% in body weight

Proportion of participants in each group that lose at least 5% in body weight

Time frame: After 52 weeks of intervention

Proportion of participants losing at least 10% in body weight

Proportion of participants in each group that lose at least 10% in body weight

Time frame: After 24 weeks of intervention

Proportion of participants losing at least 10% in body weight

Proportion of participants in each group that lose at least 10% in body weight

Time frame: After 52 weeks of intervention

Proportion of participants losing at least 15% in body weight

Proportion of participants in each group that lose at least 15% in body weight

Time frame: After 24 weeks of intervention

Proportion of participants losing at least 15% in body weight

Proportion of participants in each group that lose at least 15% in body weight

Time frame: After 52 weeks of intervention

Fat mass and fat free mass

Fat mass and fat free mass will be assessed using dual-energy x-ray absorptiometry (DXA)

Time frame: Before and after 24 weeks of intervention

Fat mass and fat free mass

Fat mass and fat free mass will be assessed using dual-energy x-ray absorptiometry (DXA)