Articles by Dr Stacy Sims

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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 carbohydrates cold fueling heat hormones menstrual cycle period protein

Cold Plunging for Women: Why Colder Isn’t Always Better

Cold plunging has exploded in popularity, with everyone from elite athletes to wellness influencers posting their ice bath rituals. But long before it hit social media, cold-water immersion was a Nordic tradition—often paired with saunas—as a way to build resilience, reset the mind, and connect...

by Dr. Stacy Sims — Nov 05, 2025 cold cortisol hormones recovery training

Kisspeptin: What We Learned from Rodents—and How We’ve Moved On

When I talk about female athletes, hormones, and health, I always start from a simple but critical foundation: energy availability. It’s the balance between how much energy you take in (from food) and how much you expend (through training, daily life, and basal metabolic rate). When that bala...

by Dr. Stacy Sims — Oct 24, 2025 cortisol fueling hormones lea menstrual cycle

What to Do Differently in Peri & Postmenopause

Perimenopause vs. Postmenopause: What Active Women Need to Know With World Menopause Day happening tomorrow, it feels like the right time to address some key questions I’m often asked about perimenopause and postmenopause. I know only too well that navigating these changes can feel confusing,...

by Dr. Stacy Sims — Oct 17, 2025 hiit hormones intensity menopause perimenopause training

The Evolution of Menstrual Cycle Training

Why We’ve Moved on from “Train by Your Phase.” For years, the conversation about women’s training centered on the menstrual cycle: do high-intensity work in the follicular phase, focus on endurance in the luteal phase, and rest during your period. (And for transparency here, I was one of the ...

by Dr. Stacy Sims — Oct 14, 2025 hormones menstrual cycle period tracking training

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

Train for Power—Not Just Strength

Most active women love to move. Whether it’s running, riding, swimming, lifting, yoga, or simply chasing your kids around, we love to break a sweat and feel the physical and mental benefits that come from that. But there’s one form of training that too often gets overlooked: power training. W...

by Dr. Stacy Sims — Sep 19, 2025 fueling lift heavy longevity strength training

Training Girls Through Puberty

If you’ve followed me for a while, you know I’m all about helping women work with their physiology, not against it. And while I’ve covered this extensively for women aged ~25+, an area of emerging interest for me—especially with a teenage daughter—has been learning and researching more about ...

by Dr. Stacy Sims — Sep 03, 2025 coaching fueling hormones lea menstrual cycle period sit

Why HIIT Matters for Women’s Body and Brain Health

If you’ve been following me for a while, you know I love busting myths—especially in women’s training. One of the most persistent? “More long, steady cardio is always better.” Don’t get me wrong—Zone 2 training has its place. It builds your aerobic base, supports mitochondrial health, and imp...

by Dr. Stacy Sims — Aug 20, 2025 cortisol creatine hiit intensity longevity recipes supplements

Longevity Advice Women Actually Need

If you’re tuned into the health and fitness world (which I’m assuming you are if you’re here!) then I’m sure you’ve heard plenty of influencers and experts talking about “longevity” and the importance of living better for longer. Yet as with so many things, I’m acutely aware that much of the ...

by Dr. Stacy Sims — Aug 06, 2025 cold collagen hydration lift heavy longevity supplements

Recipe: Overnight Protein Oats

The perfect breakfast for busy mornings on-the-go! “Six ingredients, many great variations, and theperfect make-ahead high-protein breakfast for yourbusy mornings on-the-go!” -SS INGREDIENTS ½ cup oats 2 carrots, grated 1 cup unsweetened almond or milk of choice 1 tbsp. chia seeds 2 tbsp. ...

by Dr. Stacy Sims — Aug 05, 2025 protein recipes

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 carbohydrates circadian rhythms heat hydration sleep

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