When it comes to sports nutrition, you’ll be hard pressed to find an expert with as much academic and in-the-field experience as Dr. Stacy Sims. A leading nutritionist and exercise physiologist who has worked with hundreds of professional athletes and age-groupers, Sims is a go-to resource on hydration, nutrition, and sex differences. In 2017, she was named as one of the top four individuals changing the landscape in triathlon nutrition. Dr. Sims will answers readers’ questions in her “Ask Stacy” column for Triathlete.