Investigate the impact of a 10-week whole-food plant-based (WFPB) community programme on weight and type 2 diabetes up to 36 months postintervention.

Randomised waitlist-controlled trial.

Community-based General Practice clinic classified as ‘Very Low-Cost Access’ in Gisborne, the main city of the Tairāwhiti region of New Zealand.

Adults (n=56) aged 30–72 years, with obesity (Body Mass Index (BMI) ≥30) and glycated haemoglobin (HbA1c≥40 mmol/mol) in the last 6 months. Of the participants, 59% identified as Māori and 5% as Pasifika.

A 10-week programme consisting of 2 hours, two times per week sessions (40 hours total), involving skills-based learning and health education.

Primary measures were changes in weight, BMI and HbA1c. Secondary measures included changes in cholesterol, waist circumference, exercise levels, plant-based and non-plant-based dietary scores and association with Big Five Inventory personality traits. The primary endpoint was assessed at post-treatment (10 weeks), with follow-up at 6 and 36 months postintervention.

Differences between the intervention and waitlist control groups at 10 weeks were compared with independent samples t-tests. In intention-to-treat analyses, the intervention group demonstrated significantly greater weight loss of 3.3 kg (95% CI (0.8 to 5.7), pp values

This 10-week WFPB diet community intervention decreased weight, BMI, HbA1c and cholesterol. The intervention produced a weight loss of 5 kg post-treatment, with 3 kg weight loss sustained at 36 months.

This trial was prospectively registered with the Australian New Zealand Clinical Trials Registry (https://anzctr.org.au); ACTRN12617000541303, date of registration 07/04/2017.