Study design and findings
Between 2019 and 2020, WeightWatchers invited adult members who had maintained weight loss of at least 9.1 kg (20 lb) for at least 1 year to participate in this study.
Of 7,025 participants who entered the study, 4,004 individuals (57%) who did not complete the 1-year questionnaires and others with implausible weight were excluded, leaving a final sample of 2,843 participants.
Most participants were women (92%), non-Hispanic White (95%), married (92%), and college educated. They had a mean age of 56 years.
On average, the participants had a body mass index (BMI) of 35.9 kg/m2 (grade 2 obesity) at the start of the WeightWatchers program and a BMI of 26.7 when they entered the current study.
At the 1-year follow-up, 57% of the participants had maintained the same weight (within 2.3 kg) as when they enrolled in the study, and 43% had gained ≥ 2.3 kg.
On average, the weight-loss maintainers had gained 0.4 kg (0.88 lb). The weight gainers had gained 7.2 kg (15.9 lb) but were still 19.1 kg (42.1 lb) below the weight they had when they started the WeightWatchers program.
At baseline, compared with the weight gainers, the weight-loss maintainers were on average older (58 vs. 52 years), had a lower initial BMI (26 vs. 28), and had longer duration of weight loss maintenance (4 vs. 3 years).
At 1 year, those who had maintained their weight loss had greater self-monitoring, psychological coping, physical activity strategies, dietary choice strategies, and eating and physical activity habits, and they had less eating initiation in the absence of hunger.
They also had less disinhibition, more willingness to ignore cravings and accept food urges, more future orientation, more mindfulness, more positive body image and body satisfaction, better general health and mental health, and less bodily pain.
This research was supported by a grant to Dr. Phelan from WeightWatchers (WW) International, and three study authors are employees and shareholders of the company. Dr. Jensen discloses consulting for Biohaven Pharmaceuticals and for Seattle Gummy Co.
A version of this article first appeared on Medscape.com.