Men with obesity infrequently engage with weight management services. To determine: (1) percentage weight loss at 12 and 24 months for text messages with or without financial incentives compared to control; (2) secondary outcomes; (3) cost-effectiveness; (4) moderators of effectiveness and (5) participant and stakeholder perspectives. Assessor-blinded randomised controlled trial. United Kingdom National Health Service perspective cost-effectiveness over 24 months and modelled lifetime horizon. Mixed-methods process evaluation. Five hundred and eighty-five men with body mass index ≥ 30 kg/m2 enrolled (July 2021-May 2022) in Belfast, Bristol and Glasgow; final follow-up June 2024. Random allocation to 12 months of behavioural text messages plus financial incentives (N = 196), same texts alone (N = 194) or 12-month waiting list control group offered 3 months of texts between 12 and 15 months (N = 195). A £400 financial incentive was lost if weight loss targets were not met. Weight change as a percentage of baseline weight at 12 and 24 months comparing control with (1) texts with financial incentives and (2) texts alone. Of 585 men (mean age 51 years; mean weight: 119 kg), 227 (39%) lived in lower socioeconomic areas, 146 (25%) reported a mental health condition and 253 (40%) had multiple long-term conditions. Follow-up was completed by 426 (73%) at 12 months and 377 (64%) at 24 months. At 12 months, mean percentage weight changes (standard deviation) were -4.8% (6.1) (-5.7 kg), -2.7% (6.3) (-3.0 kg), and - 1.3% (5.5) (-1.5 kg) for the incentives, text-only, and control groups, respectively. Compared to control, weight loss was significantly greater with incentives [-3.2% (97.5% confidence interval -4.6 to -1.9; p < 0.001)] but not texts alone (-1.4%; confidence interval -2.9 to 0.0; p = 0.053). At 24 months, changes were -3.9% (-4.6 kg), -2.6% (-3.1 kg), and -2.2% (-2.6 kg), no significant between-group differences. Intervention costs were £243 for texts with incentives, £110 for texts alone. There were no significant differences between 24-month costs and quality-adjusted life-years. Long-term modelling found texts with incentives versus control were: quality-adjusted life-year difference (95% confidence interval): 0.02 (0.007 to 0.029); cost difference: £176 (£43; £311); incremental cost-effectiveness ratio: £9748 (£7705 to £11,791). For texts alone versus control: quality-adjusted life-year difference: 0.03 (0.015 to 0.037); cost difference: £16.5 (-£117; £152); incremental cost-effectiveness ratio: £628 (-£5914 to £5384). There were no moderator effects for socioeconomic, health or well-being status for either comparison versus control. The texts with incentives group had a higher engagement in weight goal setting, food changes, self-weighing, confidence, satisfaction and quality of life compared to the control. Generalisability to women, diverse ethnic groups and people with low literacy is uncertain. Not generalisable to people with no mobile phone access. Retention was lowest in the text messages alone group. Texts with financial incentives have a modest but important effect to 12 months with clinically relevant weight loss maintenance to 24 months, are cost-effective and equally effective regardless of socioeconomic or health characteristics. Implementation, adapt for women, other cultures and longer-term follow-up. This synopsis presents independent research funded by the National Institute for Health and Care Research (NIHR) Public Health Research programme as award number NIHR129703. The Game of Stones study aimed to help men lose weight and keep it off for at least 2 years. Five hundred and eighty-five men living with obesity across the United Kingdom were split into three groups by chance: supportive text messages for 1 year and opportunity to get money for weight loss the same text messages alone for 1 year neither for 1 year, then text messages for 3 months. The first two groups received the same daily text messages about changing weight-related behaviours. Group 1 was told at the start that £400 had been put aside for them and that money would be lost if weight targets were missed. The targets were 5% weight loss at 3 months, 10% at 6 months and maintaining that 10% loss at 12 months. Money was then paid to the men after being weighed at 12 months. Every man was asked questions about their health, well-being and experiences of being in the study. After 1 year, the men in group 1 lost the most weight (5%, 5.7 kg). The men in group 2 lost some weight (3%, 3.0 kg) but not as much as the first group. The men in group 3 lost the smallest amount of weight (1%, 1.5 kg). On average, men in group 1 received £128 for meeting weight loss targets. One year after the 12-month measures, men in groups 1 and 2 had gained back some weight. Men in group 3 lost a bit more weight between year 1 and 2. Weight loss was similar whether or not men had long-term health conditions, disability, mental health issues or lived in the most deprived areas. This study showed that Game of Stones was a popular, low-cost and modestly effective way of helping men to lose weight.
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