March 7, 2026

@michaelokun

Why do many folks lose weight with Parkinson’s disease? The biology is more complex than eating less. Metabolism is how the body converts food into energy and regulates fuel use across organs including the brain. Gabriel and colleagues describe in a new paper in Movement Disorders how multiple biological pathways combine to drive weight loss in Parkinson’s disease. The review highlights how metabolism, gastrointestinal function, brain signaling and treatment effects all interact to shape weight trajectories across the disease course. Key Points: - Weight loss in Parkinson’s disease frequently begins years before diagnosis and can exceed 5 percent of baseline weight as the disease progresses. - Disruptions in metabolism, neuroendocrine signaling, gastrointestinal function and brain reward circuits can alter appetite, digestion and energy balance. - Weight loss is linked to frailty, cognitive decline and worse quality of life, making early monitoring and nutritional strategies important for care. My take: Weight loss in PD is not a simple story of eating less. It reflects a systems level disruption affecting metabolism including the gut, hormones and brain circuits that regulate hunger and reward. Understanding these pathways will help health care providers better recognize weight changes earlier and to intervene before frailty develops. Here are 5 points that resonated w/ me: 1- Weight loss can begin years before motor symptoms, suggesting it may be an early biological signal of Parkinson’s disease. 2- Gastrointestinal changes such as dysphagia, gastroparesis and constipation can reduce nutrient absorption and appetite. 3- Brain changes affecting smell, motivation and reward can blunt the drive to eat even when food is available. 4- Metabolic and hormonal disruptions including ghrelin, leptin and glucose signaling can create a perceived low energy state in the body. 5- Monitoring body weight at routine visits and involving nutrition specialists may help protect quality of life and reduce frailty in PD. https://movementdisorders.onlinelibrary.wiley.com/doi/10.1002/mds.70258 #parkinson #fixelinstitute #michaelokun