Articles by Dr Stacy Sims

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Holding It All Together

I’ll be honest: more than once this week I’ve woken up and it’s taken me a moment to work out which city I’m in. Highlights of the last few weeks include speaking at The Epicenter in Portland, Oregon, for the Women’s Global Sports Summit; a quick trip across the Pond for the Wellness Oasis in L...

by Dr. Stacy Sims — Oct 02, 2026 nutrition recovery sleep strength training

Puberty Isn’t A Plateau, It’s a Rebuild

Think back to when you were 12 or 13. Did you get slower? Clumsier? Was there a season where you stopped enjoying sport and nobody could tell you why? For most of us, that dip was never explained. We were told we’d lost interest, or that we needed to try harder; some of us quit entirely. It too...

by Dr. Stacy Sims — Sep 17, 2026 carbohydrates coaching fueling hormones lea menstrual cycle nutrition protein recipes recovery roar training

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 carbohydrates fueling menopause nutrition perimenopause protein training

Where Do I Start? A Roadmap for Active Women Who Want to Get It Right

If there's one question I hear more than any other right now from active women, it's this: where do I even begin? There’s no doubt you're motivated and you’re asking all the right questions: you know that training, nutrition, sleep, and stress all matter, but the sheer volume of information out...

by Dr. Stacy Sims — May 29, 2026 adaptogens creatine fueling hiit lift heavy nutrition protein sleep strength supplements

Menopause Changes Your Gut—Here’s Why It Matters

Most conversations about menopause focus on hormones. But there’s another system quietly shifting at the same time: your gut microbiome. The trillions of bacteria living in your gut influence everything from metabolism to immune function to brain health. And during perimenopause and menopause, ...

by Dr. Stacy Sims — Mar 12, 2026 gut intensity menopause microbiome nutrition perimenopause supplements

How Plants and Protein Can Help You Through Menopause

Most active women underestimate their daily protein needs—and the consequences become more pronounced in perimenopause and menopause. The current RDA for protein was established to prevent deficiency in sedentary people, not to help active women optimize their training and recovery—or to thrive...

by Dr. Stacy Sims — Mar 10, 2026 gut menopause microbiome nutrition perimenopause protein vegetarian

What Racing Kona Taught Me

Racing Kona Taught Me More Than I Ever Expected In October 2000, I stood on the start line of the Ironman World Championship in Kailua-Kona, Hawaii. I had no idea that day would shape the rest of my career—not just as an athlete, but as a scientist. Kona is brutal. It’s long, hot, humid, wind...

by Dr. Stacy Sims — Oct 06, 2025 fueling heat hydration nutrition training

ROARing into the New Year

The new revised edition of ROAR is out! Here’s what’s new. When I started working on ROAR nearly ten years ago, it was still considered fringe to say that women’s unique hormones and their menstrual cycles could impact everything from performance to injury risk to hydration and beyond. That was ...

by Dr Stacy Sims — Oct 14, 2024 nutrition roar training

Are You Draining Your Body’s Battery Power?

If you’re an active female, chances are you’re at risk for low energy availability and the health consequences it brings. Here’s what you need to know. When researchers screen the nutritional intake of female athletes, a staggering percentage are not eating enough to support their performance a...

by Dr Stacy Sims — Oct 14, 2024 fueling lea nutrition

Gut Health for Active Women

Updated March 11, 2026 Why Your Microbiome Matters for Hormones, Metabolism, and Performance When we talk about fueling for training and performance, most of the focus is on what you eat. But there’s another critical part of the equation that often gets overlooked: what your gut microbes do wit...

by Dr Stacy Sims — Oct 14, 2024 carbohydrates fueling gut hormones intensity menopause microbiome nutrition perimenopause protein

Should Women Take Collagen Supplements?

Collagen is the current darling of the wellness industry. It can benefit a lot of women, but not all supplements work the same. More women (and men for that matter) are interested in collagen supplements than ever before. Weightlifters believe they can enhance muscle mass. Athletes want them to ...

by Dr Stacy Sims — Oct 13, 2024 collagen nutrition supplements

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 carbohydrates fueling nutrition

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