Anorexia nervosa, a devastating eating disorder, has long been a complex puzzle for medical professionals. But here's where it gets controversial: a new doctoral thesis from Karolinska Institutet sheds light on the biological mechanisms behind this condition, challenging the notion that it's simply a choice.
Jingjing Xu, a PhD student at the Department of Molecular Medicine and Surgery, has dedicated four years to understanding why anorexia patients can maintain low weights for extended periods. Her research focuses on the biological factors contributing to this negative energy balance, including changes in the gut, blood, and brain.
Xu's findings reveal a fascinating interplay between genetics and metabolism. She discovered reduced levels of short-chain fatty acids, products of gut microbiome metabolism, in both anorexic patients and those in recovery, suggesting lasting gut changes. Additionally, a genetic association between mitochondria and anorexia risk was identified, potentially explaining the disrupted energy balance. The research also highlights changes in the hypothalamus, the body's appetite and metabolic control center, specifically reduced clearance of hypothalamic neuronal connections by microglia, the brain's immune cells.
This new knowledge is a game-changer. It emphasizes that anorexia is not a choice but a genetic predisposition, a critical distinction for developing effective treatments. Xu's work paves the way for evidence-based therapies that could potentially cure this debilitating mental illness.
But here's the part most people miss: anorexia is more than just a desire to be thin. It's a complex interplay of biological, psychological, and social factors. Xu's research highlights the need for a holistic approach to treatment, one that considers the unique biological makeup of each individual.
So, what's next for Xu? She plans to continue her exploration at the intersection of psychiatry, neuroscience, and metabolism, aiming to alleviate the global burden of mental illness. Her thesis, "The Neurobiology of Anorexia Nervosa: Focus on Short-Chain Fatty Acids, GDF15, and Hypothalamic Regulation of Food Intake," is a must-read for anyone interested in this field.
Join Jingjing Xu on November 14, 2025, at 09:00 in Inghesalen, Widerströmska, Tomtebodavägen 18, for her dissertation defense. This is a critical step in advancing our understanding and treatment of anorexia nervosa.
Do you think this research will lead to a breakthrough in anorexia treatment? Share your thoughts in the comments and let's spark a conversation about this important topic!
