1. SPECIFIC AIMS Racial disparities in progression to type 2 diabetes mellitus from gestational diabetes Black and white mothers have a similar prevalence of Gestational Diabetes Mellitus (GDM). However, Black women are more likely to progress to Type 2 Diabetes Mellitus (T2DM) after a GDM compared to White women. The postpartum period is a window of opportunity to transform the women's health trajectory. Unfortunately, Black women are less likely to follow up postpartum due to perceived racism and deep mistrust of the medical system. However, forming allies with professionals that are trusted members of the patient's community and can serve as a liaison to build rapport and adherence to preventative health. Community-based doulas generally live in the same area in which they serve. They provide emotional and physical support for a family from pregnancy through the first few months of the postpartum period. Doula support during pregnancy has been linked to reduced cesarean births a reduction of preterm birth, and increased breastfeeding. Unfortunately, while Black women prefer doula support, they do not have ready access to them as desired. Expanding doula training to include motivational interviewing for at-risk patients will enable doulas to provide mothers with postpartum mother/baby support and accountability as they navigate the diabetes prevention program.

Diabetes Prevention Program (DPP) The DPP was a landmark multicenter randomized placebo-controlled trial racially inclusive of 1,079 participants at risk of T2DM. It investigated the effects of a lifestyle intervention in participants who had significant risk factors for developing T2DM. The endpoint was a diagnosis of T2DM with a median follow-up of 2.8 years. Participants in the active arm had a 58% reduction in the diagnosis of T2DM. While the DPP is an effective evidence-based intervention, it is underutilized in real-world scenarios. For example, in a United States-based survey of 50,912 insured respondents who either had a formal diagnosis of pre-diabetes or had an elevated American Diabetes Association (ADA) risk score (\>5), less than one percent of respondents indicated that their doctor referred them to a formal Diabetes Prevention Program. In addition, at Vanderbilt, the postpartum workflow for patients who have been treated for GDM does not include referral to any type of Diabetes Prevention Program post-delivery.

Telehealth visits are a viable option for the delivery of healthcare. The current pandemic of Covid-19 has led to the rapid adoption of telehealth during pregnancy and the postpartum period. At Vanderbilt, we successfully employed telehealth to deliver pre and postpartum care, resulting in similar access to pregnancy and postpartum care as compared to in person visits. We have an opportunity to apply a more personalized approach to delivering a lifestyle intervention via telehealth that is tailored to recently postpartum Black women who have a significantly higher risk of T2DM by having GDM. We hypothesize that the Healthiby Diabetes Prevention Program + Doula Divas will result in a greater completion rate than women who receive a Healthiby diabetes prevention program without doulas. We will test our hypothesis using the following aims:

Aim 1: To train postpartum doulas from Homeland Heart Nashville Birth Collective (HH) with aspects of motivational interviewing techniques sufficient to enable a new mother to navigate the Healthiby DPP. To test the hypothesis that it is feasible to train community doulas from HH, we will leverage our existing relationships with our community partner-Homeland Heart and Healthiby, to train additional doulas (up to 20) in motivational interviewing necessary for the Healthiby Diabetes Prevention Program platform. We hypothesize that it is feasible to train doulas to become champions in guiding a recently postpartum black mother with gestational diabetes through this year-long program.

Aim 2: To compare the CDC-approved Healthiby (DPP only) with a doula enhanced (DPP+doula divas) guided diabetes prevention program. To test the hypothesis that Healthiby's DPP+doula diva is more effective for program completion than Healthiby DPP alone, we will randomize 100 participants between the CDC-approved online DPP (Healthiby) program and DPP (Healthiby+doula divas). We will measure rates of completion defined by the CDC whereby, participants must attend at least eight sessions in months one through six and stay in the program for at least nine months.

Our team is well situated to carry out this research and will build on the momentum from our community-engaged research program pilot grant. We have relationships with HH, and Healthiby. Our purpose is to partner with community-based doulas to coach new Black mothers with a history of gestational diabetes through an online Diabetes Prevention Program. Our intended impact is to reduce the long-term burden of T2DM in at-risk Black mothers. This proposal is responsive in integrating community doulas in preventing maternal morbidity in this vulnerable population.