Articles by Dr Stacy Sims

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You Didn't Lose Fitness, You Lost Fuel

If you grew up in the ‘80s and ‘90s, you were handed two contradictory rulebooks. First, fat was the enemy. Then, almost overnight, fat was fine and carbohydrate was the problem. Neither was built on good science, and neither was built with active women in mind, yet both stuck. I see the impact...

by Dr. Stacy Sims — Aug 26, 2026 carbohydrate carbohydrates fuel fueling menopause nutrition perimenopause protein training

Understanding PCOS in Active Women

If you’ve ever been told you have PCOS, you’re not alone—and you’re certainly not the only one confused by what that diagnosis really means. Polycystic Ovary Syndrome (PCOS) is one of the most common hormonal conditions affecting women of reproductive age, yet it’s also one of the most misund...

by Dr. Stacy Sims — Nov 07, 2025 carbohydrate cold fuel fueling heat hormones menstrual cycle period protein

Why Women Struggle with Sleep—Especially in the Summer

If you’re finding it harder to sleep, especially with the summer heat, you’re not alone. Women face unique sleep challenges—largely due to hormone fluctuations, different circadian rhythms, and even how we respond to temperature. But with the right strategies, you can improve your sleep, feel...

by Dr. Stacy Sims — Jul 23, 2025 adaptogens carbohydrate circadian rhythms heat hydration sleep

Why Fasting Doesn’t Work for Active Women

Of all the topics I cover, fasting is easily one of the most polarizing. But it’s also one I feel strongly about—because the science is clear, and I want to help women avoid its many pitfalls. While some women do say they feel good when fasting, the long-term research tells a different story....

by Dr. Stacy Sims — Jun 25, 2025 carbohydrate cortisol hormones intermittent fasting

Restricting Carbs Hurts Performance and Health

Want to avoid LEA and REDs? Eat enough carbohydrates. As fasting, keto, and carb-phobia continue to be promoted across social media, we’ve seen an uptick in low energy availability (LEA) across the spectrum of athletes. In my own work, I’ve found about 55 percent of individuals who are training...

by Dr Stacy Sims — Oct 14, 2024 carbohydrate fuel

Can (and Should) Women Carb Load?

What you need to know about the pre-event pasta party. Women perform best when they’re well-fueled. Anyone who follows me here is clear on that. Women should prioritize protein to make and maintain our muscles. We also need carbs, of course, to fuel our exercise, training, and competition. But w...

by Dr Stacy Sims — Oct 13, 2024 carbohydrate fuel nutrition

Female Athletes Need Carbohydrates

Men do, too. Research shows another downside to low-carb training. Women perform best in a fueled state. That means eating carbohydrates. That shouldn’t be a radical concept. Carbs are the preferred fuel source for our brain; they’re necessary to fuel high intensity efforts, and they improve exe...

by Dr Stacy Sims — Oct 12, 2024 carbohydrate nutrition

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