A 55-year-old male with a sedentary lifestyle and a history of obesity is undergoing a health assessment. His basal metabolic rate (BMR) is calculated at 1600 kcal/day. During the assessment, the nurse observes that the patient's caloric intake is 2500 kcal/day. What should the nurse PRIORITIZE in the patient's care plan to address his obesity?

The patient's caloric intake of 2500 kcal/day exceeds his basal metabolic rate of 1600 kcal/day, meaning he consumes significantly more energy than his body requires at rest. Since he also has a sedentary lifestyle, his total daily energy expenditure is likely only marginally above his BMR. To address obesity, the priority intervention is creating a caloric deficit — consuming fewer calories than the body expends. Encouraging increased daily physical activity raises total energy expenditure while reducing caloric intake decreases energy consumed, together producing the deficit necessary for weight loss. This dual approach is supported by evidence-based guidelines for obesity management. Recommending high-fat, high-protein meals is incorrect because, while protein can support satiety, increasing fat intake in an already calorie-surplus patient would worsen the imbalance and does not reliably boost metabolism to a clinically meaningful degree. Advising the patient to maintain his current caloric intake ignores the existing surplus and would perpetuate weight gain. The option to reduce intake to match his BMR contains a likely typographical error referencing '3MR,' but even if interpreted as BMR, simply matching BMR without accounting for activity would still leave little room for a sustainable deficit and does not incorporate the well-established benefit of combining dietary change with physical activity. The combined lifestyle approach in the first option is the most comprehensive and clinically appropriate priority.