GLP-1-driven vitamin deficiency linked to rare brain disorder: Study

Key Points:

• A rare but serious brain condition called Wernicke encephalopathy has been identified in a small number of people taking popular weight-loss drugs like Ozempic, Wegovy, Mounjaro, and Zepbound.
• Wernicke encephalopathy is caused by a severe deficiency of vitamin B1 (thiamine), which is essential for nerve function, and can lead to confusion, balance issues, abnormal eye movements, permanent brain damage, or death if untreated.
• Researchers reported 15 cases in 2023 and 2024 among users of GLP-1 medications containing semaglutide or tirzepatide, which can suppress appetite and reduce intake of vitamin B1-rich foods.
• Most patients who developed the condition experienced severe vomiting, loss of appetite, poor nutrition, or rapid weight loss, factors that contribute to vitamin B1 deficiency.
• Although the disorder is rare, the study emphasizes the importance of doctors educating patients about the risks and monitoring for early warning signs.