Randomised controlled trials (RCTs) in subjects aged 60 years or older were eligible for the review. Studies were required to report weight loss of three per cent or more of baseline body weight or 2 kg compared to baseline, body mass index (BMI) 27 kg/m2 or higher and a trial duration of at least six months. Most trials involved participants with specific health conditions such as osteoarthritis, physical frailty or type 2 diabetes. Interventions varied but included diet, exercise, diet and exercise, composite weight loss interventions, sodium reduction and resistance training and weight loss. In the included studies the mean participant age ranged from 64.0 to 71.1 years and mean BMI ranged from 30.8 to 39.0 kg/m2. Study duration (where stated) ranged from 6 to 78 months. A variety of outcomes, in addition to weight loss, were reported across the trials.
The authors stated neither how the papers were selected for review nor how many reviewers performed the selection.