Dr. Stacy Sims, MSc, PhD, is the chief research officer and a co-founder of Osmo Nutrition. Stacy is an exercise physiologist and nutrition scientist with almost two decades in the field and is also a longtime endurance athlete.

Stacy’s endurance career started when she ran cross country races in high school. She went on to race crew for Purdue in college, was an ultra runner and raced the Kona Ironman triathlon in her late twenties. More recently she raced as a pro-elite roadie and in the Xterra Worlds. Stacy’s interest in sports, health, and nutrition has long driven her research subject matter. The topic for her PhD study came to her deep into the Ironman’s Kona, Hawaii race course and this jumpstarted her PhD studies in thermoregulation and hydration at the University of Otago in Dunedin, New Zealand. She promised herself she would give up Ironman competition for the duration of graduate school, but still raced her bike.

Stacy moved from New Zealand to the Bay Area in March 2007 where she was recruited to work as the exercise physiologist in the human performance lab at Stanford University. She then moved into disease prevention research to continue her studies in thermoregulation and nutrition across all populations (including sedentary obese individuals and elite athletes). Outside of her work at Stanford and at Osmo Nutrition, Stacy works with individual endurance athletes to help them dial in hydration and nutrition to boost their performance and succeed in their sports. Stacy also consults for the USA Cycling Women’s Track endurance program, USA Cycling BMX, Xterra champion Dan Hugo, individuals of Team Tibco and the Webcor professional women’s cycling, Matt Dixon of Purplepatch Fitness, and Craig Upton of Performance Labs HC.

Stacy worked with Garmin-Slipstream for the 2009 Tour de France, assisted Lance Armstrong in researching thermoregulation in 2010, and with Andy Schleck for nutrition and thermoregulation in 2011. Stacy believes that exercise stress adaptations and nutrition go hand in hand, thus knowing the explicit demands of each mode, duration, and intensity of exercise are predictors of just which nutritional alterations benefit an individual the most, whether related to improving performance, preventing injury, rehabilitation, or general health.