Dr. Stacy Sims

Do you experience a brief spell of dizziness, nausea, headache, or blurred vision at the start of a workout or race? Rebound hypoglycemia may be the culprit.

Spoiler alert: Research shows fasting might not be the answer for athletes - especially female athletes - looking to maintain good metabolic and cardiovascular health.

Triathletes, especially those racing longer distances, are often warned about low sodium levels in the blood - AKA hyponatremia. But hold off on the salt tabs! Dr. Stacy Sims explains why they're not the solution for exercise-associated hyponatremia, plus the strategies that actually work.

"Dear Stacy: I've heard some triathletes take anti-diarrheal medicines like Imodium before a race to prevent GI distress. Is this a good idea?"

Leading sports nutritionist and exercise physiologist Dr. Stacy Sims explains why we experience GI distress when training and racing in the heat - and what to do about it.

As temperatures rise, we need to adjust more than our pace and fluid intake—science says there are foods and supplements that can specifically help your body's systems in the heat.

Supplements may seem like a no-brainer, but what you need can vary based on who you are—and what conditions you're training and racing in.

A liquid-only fueling strategy might not be the way to go, explains Dr. Stacy Sims.

Tracking your training with your menstrual cycle can have a huge impact on performance.

Should I abstain from caffeine for a period of time leading up to my event to get a bigger boost when using it on race day?

We keep hearing the phrase "Lift Heavy Sh*t"—but why? We look at the array of benefits it brings for endurance athletes.

Navigating your way around sugars—both natural and added ones—can be a tricky task.

These delicious, nutritious family-friendly meals also serve as great training foods - saving you time, energy, and endless "what's for dinner?" queries.

If you don’t top off your tank in the morning, you’ll lack the mental and physical energy you need to get through your workout and your workday.

It can make or break your race or workout, so do you know all you should about staying well hydrated?

Leading sports nutritionist and exercise physiologist Dr. Stacy Sims answers your most pressing fueling questions.

Understanding how to race well in the heat can help you unlock your potential when the temperature rises—and it's not as complicated as you think.

We look at some of the factors that might help explain why swimming often leaves you feeling famished.

Race morning is not the time to try something new.

Knowing how much protein to eat each day can play an important role in your training and recovery.

Knowing how best to approach eating and drinking in the week leading into your race can really help set you up for success.

Leading sports nutritionist and exercise physiologist Dr. Stacy Sims answers your most pressing questions.

Knowing when and how to take on carbs is a debate that continues to rage in the sports nutrition world.

Learning how to mitigate GI distress in training and racing can be well worth doing—but when is the right time to train your gut?

There's a difference between health and performance.

It can be hard to know which, if any, are the right supplements to take for optimal health, wellbeing, and performance.

With very few—if any—events on the horizon for most of us, we ask the expert if it's still worthwhile testing your race-day routine.

Sports nutritionist Dr. Stacy Sims explains the far-reaching impact of gut health.

Sports nutritionist Dr. Stacy Sims shares some of her favorite fueling recipes with us.

It's not uncommon to feel lethargic mid-afternoon—but understanding the causes can help you beat it.

Leading sports nutritionist and exercise physiologist Dr. Stacy Sims answers your most pressing questions.

Understanding what drives your metabolism is key to keeping it healthy.

Runners' trots are remarkably common—but why and how can you reduce the chance of this happening?

Sports nutritionist Stacy Sims gives us the lowdown on sodium from an athlete's perspective.

There are many factors to consider when trying to solve your headache woes.

There are pros and cons to each, but which will help you recover faster?

Dr. Stacy Sims examines the impact that alcohol has on our bodies—and how best to time it around training.

Dr. Stacy Sims does a scientific deep-dive on caffeine and its effect on performance.

Looking to lose weight? Dr. Stacy Sims explains why starting with a good night’s sleep could be the most important first step.

Fueling is key when it comes to “going long”—here’s how to get it right with expert advice from Dr. Stacy Sims.

This week Dr. Stacy Sims talks real food versus gels, and post-workout carbs for female athletes. 

Leading sports nutritionist and exercise physiologist Dr. Stacy Sims answers your most pressing nutrition questions.

Dr. Stacy Sims gives her advice on fasted training, the best ways to avoid GI distress during an Ironman, and ideal carb intake in the lead-up to a race.