Summary: In a multicentre randomised controlled trial of 200 women with gestational diabetes mellitus (171 completers), a cognitive behavioural therapy (CBT)-based digital dietary programme added to standard care modestly raised the glycaemic qualification rate (87.9% vs 81.9% at follow-up 3; P=.02) and lowered post-lunch and post-dinner glucose, but showed no benefit on fasting or post-breakfast glucose. Macrosomia was less frequent in the intervention arm (5% vs 15%; P=.04).
PICO Summary
| Element | Detail |
|---|---|
| Population | 200 pregnant women with gestational diabetes mellitus randomised (171 completed); mean age 31.2 years, mean gestational age 26.3 weeks at enrolment; baseline HbA1c comparable (5.2% vs 5.1%; P=.97). Multicentre RCT, China. |
| Intervention | Standard care plus a CBT-based digital dietary intervention delivered through a customised WeChat mini-programme (structured dietary education, food selection and meal-sequencing strategies); approximately 100 women randomised to this arm. |
| Comparison | Standard care alone; approximately 100 women randomised. Open-label design (participants and dietitians were not blinded). |
| Outcome | Primary: glycaemic qualification rate higher with the intervention at follow-up 3 (87.9% vs 81.9%; P=.02), follow-up 4 (91.0% vs 87.2%; P=.04) and follow-up 5 (94.0% vs 91.5%; P=.04). Post-lunch glucose lower (2 h: 5.1 vs 5.3 mmol/L; P=.03) and post-dinner glucose lower; no significant difference in fasting glucose or post-breakfast glucose. Macrosomia 5% vs 15% (P=.04). No 95% CIs, absolute risk reduction or NNT reported in the abstract. |
CBT-based digital diet in gestational diabetes
RCT · gestational diabetes · multicentre
A CBT-based digital diet programme modestly raised the glycaemic qualification rate and reduced macrosomia, but only post-lunch and post-dinner glucose improved. The open-label design and industry ties warrant cautious, adjunctive use.
Expert Commentary
This randomised trial offers a positive but cautious signal that behavioural support, not just dietary information, can improve adherence-driven glycaemic targets in gestational diabetes. The primary endpoint was met, and the macrosomia difference (5% vs 15%) is clinically appealing because it speaks to the outcome that matters most to families. The effect was, however, confined to post-lunch and post-dinner glucose; fasting and post-breakfast values were unchanged, which suggests the programme nudges behaviour around larger meals rather than transforming overall metabolic control. The headline percentage-point gains in the qualification rate are small, and the trial was open-label, so expectancy and closer digital contact could have inflated the apparent benefit. Sponsorship is a further consideration: several authors are affiliated with the technology company that built the WeChat tool, so independent replication is warranted before strong claims are made. The macrosomia finding rests on small event numbers and should be read as hypothesis-generating, not definitive. Can I use this with my patients? Cautiously yes, as an adjunct for motivated women with gestational diabetes who already use a smartphone and need help with meal-time adherence, but it is not a substitute for standard dietetic and obstetric care. A larger, blinded-assessment trial with hard neonatal outcomes and pre-registered analysis would tell us whether this is a durable tool or a well-supported pilot. For now, it deserves a place on the watch list rather than the protocol.
References
Pan Y, Tang J, Lu B, Kuang M, Zhao M, Liu H, Zhong S. Effects of Cognitive Behavioral Therapy for Diet on Postprandial Glucose and Pregnancy Outcomes in Gestational Diabetes Mellitus: Multicenter Randomized Controlled Trial. J Med Internet Res. 2025;27:e71075. doi:10.2196/71075