Summary: In primary care veterans with overweight or obesity, a low-intensity peer coaching programme improved early weight loss and more than doubled engagement with weight-management services, but the 12-month weight difference was not statistically significant (P=0.05).
PICO Summary
| Element | Detail |
|---|---|
| Population | 281 primary care veterans (mean age 50.6; 78.6% male) with BMI ≥25, at one VA site (cluster randomised). |
| Intervention | Peer coaching: one in-person session, up to 12 phone calls, and a tablet goal-setting tool over 12 months. |
| Comparison | Enhanced usual care (health education materials, no peer support). |
| Outcome | 12-month weight change -2.51 vs -0.79 kg, not significant (P=0.05). At 6 months more achieved ≥5% loss (16.7% vs 5.5%; P=0.03) and attended weight programmes (28.7% vs 13.3%; P=0.02). Enrolment stopped early due to COVID-19. |
Peer coaching for weight management in primary care
Cluster RCT · overweight/obesity · 12 months
Peer coaching did not significantly improve 12-month weight loss but more than doubled engagement with formal weight-management programmes. Best used to get patients through the door of structured care, not as a standalone treatment.
Expert Commentary
Peer coaching is exactly the kind of scalable, low-cost idea I want to believe in, because primary care simply cannot deliver intensive behavioural support to everyone who needs it. This trial gives me a genuinely mixed picture that I have to read honestly. The primary outcome, weight at twelve months, did not reach significance, sitting right on P equals 0.05, and the early advantage had faded by then. So as a weight-loss intervention in its own right, it underdelivered. What I find more useful is the engagement signal: peer coaching more than doubled the proportion of patients who actually entered formal weight-management programmes, which fits the wider truth that intensity and sustained contact, not a light-touch nudge, drive durable weight loss. The single-site, mostly male veteran sample and the COVID-disrupted enrolment limit how far I can generalise. Can I use this with my patients? Yes, but framed accurately, as a way to get people through the door of structured programmes and sustain early momentum, not as a standalone path to lasting weight loss. I would pair it with more intensive behavioural therapy or pharmacotherapy where appropriate.
References
Wittleder S, Wong L, Ruan AM, et al. Peer coaching to support weight management in primary care: a cluster randomized clinical trial. JAMA Netw Open. 2025;8(9):e2529136. doi:10.1001/jamanetworkopen.2025.29136