Why pairing a burger with a soda may be a bad idea

05:04

NBC medical contributor Dr. Natalie Azar is on TODAY to talk about the latest medical studies, including the disconcerting news that pairing a burger with soda may hinder metabolizing fat, and a study that shows that gaining or losing just five pounds can have a big impact on your health. Also in the medical headlines: a possible link between sleep apnea and Alzheimer’s.