Harvard doctor Warns of Potential esophageal Risk from Chia Seed Consumption
boston, MA – September 21, 2025, 06:32:58 EDT – A Harvard Medical School physician is raising concerns about a perhaps serious, yet ofen overlooked, health risk associated with consuming chia seeds: esophageal obstruction. Dr. David S. Seres, Director of Medical Nutrition & Weight Management at Beth Israel Deaconess Medical Center, detailed a recent surge in cases requiring endoscopic removal of chia seed obstructions in the American Journal of Gastroenterology.
While widely touted as a superfood rich in fiber, omega-3 fatty acids, and antioxidants, chia seeds’ remarkable ability to absorb liquid can become hazardous if not properly managed. The seeds expand significantly when exposed to fluids, and if consumed dry or with insufficient liquid intake, they can swell in the esophagus, creating a blockage that can cause discomfort, difficulty swallowing, and potentially require medical intervention.The number of reported cases has increased in recent years, coinciding with the growing popularity of chia seeds as a dietary supplement and ingredient in various food products.
Dr. Seres’ research highlights that individuals with pre-existing swallowing difficulties (dysphagia),or those who do not adequately hydrate while consuming chia seeds,are especially vulnerable. He observed a cluster of cases at his Boston hospital, prompting a deeper investigation into the phenomenon. “The problem is that people are eating these seeds dry, or not drinking enough water with them,” Dr.Seres explained in a recent interview. ”They swell up and get stuck.It’s not a common occurrence, but it’s happening more frequently.”
the cases documented involved patients experiencing symptoms ranging from mild chest pain to complete inability to swallow. Endoscopic procedures were successfully used to remove the chia seed obstructions in all reported instances, but dr. Seres cautions that prolonged obstruction could lead to more severe complications. He recommends consuming chia seeds with at least 16 ounces of water and avoiding dry consumption altogether. Further research is planned to determine the precise incidence rate of chia seed-related esophageal obstructions and to develop preventative guidelines for consumers.
