Study protocol for a mobile app that delivers peer-led mental health support to adults with type 1 diabetes: The REACHOUT randomized wait-list controlled trial

Tricia S Tang 1Gerri Klein 2Lawrence Fisher 3Jennifer C Davis 4Linda Li 5Matthias Görges 6Jane Yardley 7William H Polonsky 8Danielle Hessler 9Deanne Taylor 10Akshay Jain 11Joel Singer 12Logan McLean 13Tara Klassen 14

Abstract

Peer support and digital technology are two promising strategies to address psychosocial needs in type 1 diabetes (T1D). REACHOUT is a mobile app designed to deliver peer-led mental health support to adults with T1D living in British Columbia. This report describes the methodological design and recruitment for the REACHOUT randomized wait-list controlled (WLC) trial. The primary goal was to examine whether participation in the REACHOUT intervention was associated with reductions in diabetes distress compared to a WLC condition (eligible to receive the intervention after six months). Two-hundred twenty-five adults with T1D (age 19-81 years) completed a baseline survey;113 participants were randomized to the six-month REACHOUT intervention and 112 to the WLC condition. REACHOUT offers support that is choice-based, customizable, and just-in-time. Support delivery modalities include one-on-one support from a participant-selected peer supporter, group-based text support using a 24/7 chat room and topic-specific discussion boards, and small group virtual face-to-face support. The primary outcome of this trial was diabetes distress; secondary outcomes included depressive symptoms, perceived social support, diabetes-specific quality of life, and resilience; exploratory outcomes were A1c, time in range, health resource utilization, and cost-effectiveness. The goal of this research is to examine whether a mobile app that delivers peer-led and personalized mental health support can improve diabetes distress and other mental health outcomes among adults living with T1D.

Study protocol for a mobile app that delivers peer-led mental health support to adults with type 1 diabetes: The REACHOUT randomized wait-list controlled trial – PubMed

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June 5-8
June 5-8ADA Scientific Sessions
June 5 - 8: It will be a busy time at the American Diabetes Association’s 85th Scientific Sessions (New Orleans, LA), with new projects to be developed, old friends to see, and much to learn. Dr. Polonsky, BDI President, will serve a co-author on four poster presentations
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August 14-16ONE 2026
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October 24
October 24CME Workshop
On October 24, BDI will host a live, one-day, CME workshop: Engaging the Disengaged: Innovative Strategies for Promoting Behavior Change in Diabetes. Run by Dr. Polonsky (BDI President) and Dr. Guzman (BDI Clinic Director), Participants will deepen their skills in recognizing and addressing common barriers to effective self-care and cardiometabolic medication initiation and maintenance, while fostering respectful, stigma-free clinical encounters.