OBJECTIVE: This trial evaluated the effectiveness of a joint health coach and dietitian lifestyle clinic led by a family physician for overweight and obese adults in lowering body mass index (BMI) and improving waist circumference (WC) measurement among overweight and obese individuals. DESIGN AND SETTING: The study was a 6-month, parallel, open-label, clustered, randomized trial with control involving four primary health care centers in Hail City. PARTICIPANTS: Of the 300 healthy adult volunteers screened, 198 met the inclusion criteria and completed the study. Participants were randomized into four clusters and assigned to either the intervention or control group. Intervention: A structured dietary, physical exercise, behavioral, and cognitive lifestyle intervention provided by a joint health coach and dietitian clinic led by a family physician. PRIMARY MEASURES: The primary outcomes were reductions in BMI, improvements in WC distribution, and weight loss differences from baseline to 6 months, with a target of 5% weight loss. RESULTS: A significant reduction in BMI in the intervention arm (mean BMI intervention before 36.74, mean BMI intervention after 33.82, mean difference 2.91, p < 0.001) compared to the control (routine care) arm is evident. Additionally, the intervention group had notable improvements in WC measurements; however, it is not statistically significant. CONCLUSION: The joint lifestyle clinic run by a health coach and a dietitian and led by a family physician is effective in reducing BMI and improving WC measurement. The trial was registered with ClinicalTrials.gov under the identification number NCT05654337 and did not receive specific funding.

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