Hans (Jonathan) Purtell, MS, RD, CDN Title: Registered Dietitian Board Certified Registered Dietitian through the Commission on Dietetic Registration Experience Jonathan Purtell, MS, RDN, CDN, is a registered dietitian at Lenox Hill Hospital. His primary interests include surgical and neurosurgical intensive care, orthopedic, obese/post-bariatric, and gastrointestinal patients. He is also a contributing writer for multiple publications including USA Today, Health Digest, Shape, and Livestrong. Education Jonathan received his bachelor's and postgraduate degree with Honors in Nutrition and Dietetics from SUNY Oneonta. He also completed a graduate internship in dietics at the Mohawk Valley Health System in Utica, New York. About Health Health.com, a Dotdash Meredith Brand, is an award-winning online resource for empathetic, trustworthy, and actionable health and wellness information so you can make the best choice for your health. We reach more than 9 million readers a month. We ensure the accuracy of our content by relying on seasoned health journalists, credentialed medical professionals and thorough fact checkers. Learn more about us and our editorial process.