Sustained, Effortless Weight Loss after Damage to the Left Frontoinsular Cortex: A Case Report.

This case report highlights a possible consequence of damage to the left frontoinsular region. A 53-year-old woman with chronic obesity and headaches presented with seizure, leading to the discovery and resection of a large sphenoid wing meningioma. Postoperative brain imaging revealed loss of the left frontoinsular cortex and portions of the underlying white matter, claustrum, and striatum. Throughout her adult life, this patient had tried and failed to lose weight, but after surgery, she no longer desired to eat large meals, and without effort, her body mass index decreased from 38.6 (85th percentile) to 24.9 (25th percentile). Combined with previous research implicating the insular cortex in interoception, appetite, and drug-related urges, her reduced hunger and effortless weight loss after resection of the left frontoinsular cortex suggest that this region of the human brain may play a role in hunger-related urges that contribute to overeating.