Given the nature of the intervention, we did not anticipate any adverse events in the usual sense, so safety outcomes were not assessed. We also assessed asked patients' about their feelings on discussing their weight when they have visited their general practitioner for other reasons. The primary outcome was weight change at 12 months in the intention-to-treat population, which was assessed blinded to treatment allocation. In the control intervention, the physician advised the patient that their health would benefit from weight loss. In the active intervention, the physician offered referral to a weight management group (12 sessions of 1 h each, once per week) and, if the referral was accepted, the physician ensured the patient made an appointment and offered follow-up. Randomisation was done via preprepared randomisation cards labelled with a code representing the allocation, which were placed in opaque sealed envelopes and given to physicians to open at the time of treatment assignment. At the end of the consultation, the physician randomly assigned participants (1:1) to one of two 30 s interventions. Individuals could be enrolled if they were aged at least 18 years, had a body-mass index of at least 30 kg/m 2 (or at least 25 kg/m 2 if of Asian ethnicity), and had a raised body fat percentage. In this parallel, two-arm, randomised trial, patients who consulted 137 primary care physicians in England were screened for obesity. We did this trial to establish whether physician brief intervention is acceptable and effective for reducing bodyweight in patients with obesity. However, physicians rarely intervene and no trials have been done on the subject. Guidelines recommend that physicians screen and offer brief advice to motivate weight loss through referral to behavioural weight loss programmes. Obesity is a common cause of non-communicable disease.
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