While weight loss is often the goal of weight management, weight management in older adults should go beyond weight loss to focus on functional health outcomes, comorbidity improvements, and harm reduction.
Weight management in older adults requires greater mindfulness and clinical nuance than in younger populations, owing to the increased risk of potential harm. Aging is commonly accompanied by a rise in medical complexity — older adults are more likely to live with multiple chronic conditions and to take several medications, which adds important layers of consideration when pursuing weight loss interventions.
Over 50% of older adults have three or more chronic diseases. These overlapping conditions demand coordinated, multidisciplinary care. Within this context, clinicians must consider how meaningful weight loss might improve obesity-related complications, while also weighing the potential for unintended consequences that can arise from rapid or unmonitored changes in health status.
Polypharmacy is a common concern in geriatric care and adds to the complexity of weight management. Among adults aged 65 and older with Medicare insurance, the median number of prescription medications was four. Older patients may be prescribed medications associated with potential weight gain, such as first-generation antihistamines or beta-blockers.
Polypharmacy not only increases the risk of adverse drug-drug interactions but also necessitates vigilant monitoring during weight loss, particularly when medications are weight-dependent. A case report on thyrotoxicosis in the setting of 30% weight loss with tirzepatide highlighted the importance of adjusting weight-based medications like levothyroxine.
Because obesity is the root cause or contributor to several other cardiometabolic diseases, obesity treatment has been demonstrated to improve several weight-related consequences. The Look AHEAD trial of adults with type 2 diabetes reported an average 8.6% weight loss and associated improvements in blood pressure, lipid profiles, and glycemic status. Obesity pharmacotherapy advances, which now grants access to 15%-20% weight loss thresholds, have been associated with de-escalation of antihypertensive and lipid-lowering therapies. In a secondary analysis of trials for semaglutide 2.4 mg, 34% vs 15% of participants experienced a discontinuation or dose reduction in their anti-hypertensive medication, while maintaining normal blood pressures. While such observational data is insufficient to establish recommendations, they implore attention: As weight loss is achieved, medication regimens should be regularly reviewed for potential deprescribing to reduce the risk of overtreatment, adverse effects, and polypharmacy-related complications.
Beyond cardiometabolic disease, sarcopenia— the age-related decline in muscle mass and function — is another critical consideration. Clinicians should focus on evidence-based nutrition and physical activity recommendations demonstrated to preserve lean mass and function. Higher protein intake has been consistently demonstrated to preserve lean mass or improve body composition in the setting of weight loss. High protein diets (ie, greater than 0.8 g/kg/d) are commonly recommended alongside a progressive strength training program.
In a weight loss study of adults with obesity, participants were randomized to a high protein supplement vs an isocaloric supplement and participated in a resistance exercise program 3 times/week for 13 weeks. While weight loss and fat mass loss between groups did not differ, those on the higher protein supplement (1.1 g/kg/d of protein) gained 0.4 kg +/- 1.2 kg of appendicular muscle mass while those on the isocaloric supplement (0.85 g/kg/d of protein) lost 0.5 +/- 2.1 kg (P =.03).
Similar studies focusing on resistance training have replicated these benefits across studies. A systematic review and meta-analysis of six randomized controlled trials that enrolled older adults with obesity compared weight loss via caloric restriction alone vs weight loss via caloric restriction plus resistance training; resistance training reduced 93.5% of the lean body mass loss associated with calorie restriction. Additionally, the strength-to-lean body mass ratio improved when resistance training accompanied calorie restriction compared to calorie restriction alone (20.9% vs -7.5%).
However, muscle preservation is only half the story. Bone health is an equally important concern during weight loss in older adults. Rapid or sustained weight reduction can have unintended effects on bone density, which in turn can increase the risk of fractures. Few studies have examined the incidence of fracture rate after long-term and sustained weight loss. In the aforementioned Look AHEAD study of adults with type 2 diabetes, no significant difference in incident fracture rate was observed over a median of 9.6 years (373 participants randomized to intensive lifestyle intervention vs 358 randomized to standard diabetes education), but a composite of the first occurrence of a hip, upper arm, or shoulder fracture was found to be 39% higher in the intervention group. Long-term outcome studies examining risk of fractures with medical weight management have not been conducted, but the increased risk of fractures observed among individuals who have undergone bariatric surgery informed guidelines to recommend earlier, repeated osteoporosis screening and higher vitamin D supplementation to optimize bone health.
Overall, obesity management in older adults requires a careful and tailored approach that is attentive to comorbidity management and that prioritizes risk mitigation. Increasingly, the effects of obesity on all aspects of a person’s quality of life is being recognized, and patients should be informed on how weight loss may interact with coexisting medical conditions, medication regimens, and musculoskeletal health. Clinicians who treat obesity in older adults should be prepared to manage patients across these intersections, or coordinate care with registered dietitian-nutritionists, exercise physiologists, endocrinologists, and primary care professionals.
link