Lifestyle Interventions to Prevent Diabetes in U.S. Home Visiting Programs

Not Applicable

Not yet recruiting

• Conditions: Diabetes Mellitus; Gestational Diabetes Mellitus (GDM)

• Registration Number: NCT06988306
• Lead Sponsor: California Polytechnic State University-San Luis Obispo

Brief Summary

The study is examining the health effects of gestational diabetes mellitus (GDM) intervention and medically tailored meals within home visiting. A large study is proposed that will include nearly a thousand pregnant or recently pregnant adults with recent GDM and who are from different regions and backgrounds. Two treatment approaches are compared, and both are in home visiting. One treatment group is receiving enhanced lifestyle support for GDM along with meals, and the other is receiving just the enhanced lifestyle support. The study will examine whether these interventions help reduce diabetes and pre-diabetes through 12 months postpartum, as well as other health factors like weight and blood pressure.

Detailed Description

Gestational diabetes mellitus (GDM) is rapidly rising in prevalence and has been linked with several short and long-term adverse maternal health outcomes, including type 2 diabetes (T2DM) and cardiovascular disease. The postpartum year is a time of heightened risk, and 32-46% of people with GDM develop type 2 diabetes (T2DM) or Pre-Diabetes (PreDM) during the postpartum year. To prevent maternal diabetes, US guidelines recommend behavioral counseling to promote healthy eating, activity, and weight, but dissemination channels have been lacking. Evidence-based home visiting programs, with their well-established infrastructure in every state and focus on maternal and child health, are a promising platform through which the recommended behavioral interventions could reach people with GDM and reduce health disparities. Effective GDM intervention within home visiting needs to be potent, build on existing content, and remain brief, so as not to displace other evidence-based content. Integrating referral to medically tailored meals (MtMs) is a Food is Medicine strategy that may prevent and mitigate maternal diabetes in home visiting. Access to MtMs has been expanding rapidly in the US, with 10 states currently having and 5 states pending Medicaid Service waivers that offer coverage for MtMs. Systematic reviews have found that providing MtMs allows patients to experience significantly better glucose and weight management, improved food insecurity and dietary quality, and greater treatment satisfaction. MtMs also benefit health systems, insurers, and governments through reduced costs and fewer hospitalizations and emergency department visits. However, national calls and systematic reviews have identified a major evidence gap and the need for adequately powered effectiveness trials to determine whether MtMs are effective in treating and preventing maternal diabetes. For MtMs to continue as a treatment approach for GDM, compelling evidence is needed that they work and for whom and in what context. The primary aim of this study is to evaluate the 12-month incidence T2DM/PreDM in people with GDM who receive GDM Enhanced + Meals vs. GDM Enhanced Only within home visiting. A robust implementation process evaluation will inform ensure successful sustainment and reach for diverse pregnant and postpartum people with GDM. We propose a Hybrid Type 1 effectiveness-implementation trial. We will recruit 978 perinatal, English or Spanish-speaking adults nationwide from three clinical centers serving the West, Midwest/South, and East regions. Home visiting clients (35% Black; 40% Hispanic) with recent GDM diagnosis and will be randomized within site and home visiting agency to one of two treatment arms: GDM enhanced lifestyle intervention plus MtMs (GDM Enhanced + Meals) or GDM Enhanced Only. The primary study aim is to evaluate the 12-month incidence of T2DM/PreDM. Secondary aims will examine treatment group differences in health factors (weight, blood pressure) and client-centered outcomes (diet quality, physical activity, home food environment, food security, quality of life, treatment satisfaction, self-efficacy, mood) at 3, 6, and 12 months postpartum. Key moderators (Black/White race, Hispanic/Non-Hispanic ethnicity, food security), and mediators (changes in weight, dietary quality, physical activity, and the home food environment) will be identified. The RE-AIM framework will guide an implementation process evaluation to plan for successful delivery and sustainment of the interventions. Findings from this from large scale, adequately powered trial of MtMs for maternal health will fill a major gap in the literature. If the MTM approach is found effective, there will be strong justification to bolster access (at state level) and referrals (within home visiting) to MtMs. Findings will inform tailored strategies to ensure successful sustainment in home visiting and reach for diverse pregnant and postpartum people with GDM.

Study Timeline

• Study First Submitted: 2025-04-06
• Status Verified: 2025-05
• Study First Submitted QC: 2025-05-15
• Last Update Submitted: 2025-05-15
• Study First Posted: 2025-05-23
• Last Update Posted: 2025-05-23
• Study Start: 2026-01-31
• Primary Completion: 2030-04-30
• Study Completion: 2030-04-30

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: Female
• Target Recruitment: 978

Inclusion Criteria

• Currently in home visiting
• Pregnant or < 3 months (13 weeks) postpartum
• Gestational Diabetes Mellitus diagnosis in most recent pregnancy (based on self-report)
• Aged 18 years or older
• English- or Spanish-speaking.
• Not currently being given medically tailored meals
• Willing to receive randomization to either group

Exclusion Criteria

• Pre-existing diabetes (based on self-report)

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Diabetes/Pre-Diabetes	From enrollment to 12 months postpartum	The Primary Outcome Measure in this study is a categorical outcome of glucose tolerance (i.e., healthy glucose tolerance vs. type 2 diabetes/pre-diabetes) at 12 months postpartum. The test will be conducted at CLIA-certified lab. A 2-hour oral glucose tolerance test (OGTT) will characterize people into one of two categories: 1) healthy glucose tolerance; or 2) type 2 diabetes (2-hour post 75g load glucose level of 200 mg/dL or greater) or pre-diabetes (a 2-hour post 75g load glucose level of 140 to 199 mg/d).

Secondary Outcome Measures

Name	Time	Method
Systolic blood pressure	From enrollment to 3, 6, and 12 months postpartum	Systolic blood pressure will be self-measured in the home with trained research assistants guiding the assessment
Diastolic blood pressure	From enrollment to 3, 6, and 12 months postpartum	Diastolic blood pressure will be self-measured in the home with trained research assistants guiding the assessment
Body weight	From enrollment to 3, 6, and 12 months postpartum	Body weight is obtained using remote scales provided to participants.
Child zBMI	From 3 months to 6 and 12 months	Remote, guided parent measurements of child weight and length will be used to calculate the child's body mass index z-score (zBMI), along with parent-reported infant sex.
HbA1c concentration	From enrollment to 3, 6, and 12 months postpartum	HbA1c will be measured utilizing an at-home test kit (finger-stick, whole-blood test)
Diet quality	From enrollment to 3, 6, and 12 months postpartum	The Automated Self-Administered (ASA) 24-hour Recall of the National Cancer Institute will be used by trained staff to obtain an interview-based assessment of dietary quality. Healthy Eating Index (HEI) scores will be calculated by linking ASA24 output to the HEI scoring algorithm, which evaluates diet quality based on alignment with the Dietary Guidelines for Americans.
Metabolic equivalent task minutes per week of moderate-to-vigorous physical activity	From enrollment to 3, 6, and 12 months postpartum	The International Physical Activity Questionnaire will be used to measure metabolic equivalent task (MET)-minutes per week of moderate-to-vigorous physical activity. Scores range from 0 to \>10,000 MET-minutes/week, with higher scores indicating greater physical activity, which is considered a better outcome.
Home Food Environment	From enrollment to 3, 6, and 12 months postpartum	The home food environment checklist will be used to measure number of healthy foods in the home. Higher scores indicate a greater number of healthy foods present.
Food Security	From enrollment to 3, 6, and 12 months postpartum	The U.S. Household food security survey will be used to measure a categorical classification or high food security, marginal food security, low food security, and very low food security
Global Physical Health	From enrollment to 3, 6, and 12 months postpartum	The Patient-Reported Outcomes Measurement Information System (PROMIS) Global Health 10-item scale will be used to assess Global Physical Health (GPH). Raw scores are converted to T-scores, standardized to the U.S. general population (mean = 50, SD = 10). T-scores typically range from 20 to 80, with higher scores indicating better health.
Global Mental Health	From enrollment to 3, 6, and 12 months postpartum	The Patient-Reported Outcomes Measurement Information System Global Health 10-item scale will be used to assess Global Mental Health. Raw scores are converted to T-scores, standardized to the U.S. general population (mean = 50, SD = 10). T-scores typically range from 20 to 80, with higher scores indicating better health.
Nutrition Self-Efficacy	From enrollment to 3, 6, and 12 months postpartum	The Nutrition Self-Efficacy Scale will be used to assess participants' confidence in their ability to engage in healthy eating, yielding a continuous self-efficacy score. Each item is rated on a 5-point Likert scale from 1 (not at all confident) to 5 (very confident), resulting in a total score range of 10 to 50. Higher scores reflect greater self-efficacy for healthy eating behaviors
Center for Epidemiologic Studies Depression Scale	From enrollment to 3, 6, and 12 months postpartum	The Center for Epidemiologic Studies Depression Scale - 10-item version (CES-D-10) will be used to assess depressive symptoms. Each item is rated on a 4-point Likert scale from 0 (rarely or none of the time) to 3 (most or all of the time), yielding a total score range of 0 to 30. Higher scores indicate greater depressive symptomatology.
Barriers to Healthy Eating	From enrollment to 3, 6, and 12 months postpartum	Barriers to Healthy Eating Questionnaire is 14-items and assesses perceived barriers to healthy eating. The total score is calculated by summing all 14 items. Total scores range from 0 to 14, with higher scores reflecting greater overall perceived barriers to following a healthy eating pattern.

Trial Locations

Locations (3)

California Polytechnic State University; 🇺🇸 San Luis Obispo, California, United States

Northwestern University; 🇺🇸 Chicago, Illinois, United States

Miriam Hospital; 🇺🇸 Providence, Rhode Island, United States