Articles by Dr Stacy Sims

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Tags: hormones

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How Well Will You Age?

You might have noticed there’s a word you can't escape right now: longevity. Everywhere you turn there seems to be supplements, podcasts, and biohacking protocols all promising to help you live longer. But longer isn’t the same as better. And here's the thing nobody's telling you: women already...

by Dr. Stacy Sims — Jun 12, 2026 circadian rhythms hormones intermittent fasting longevity menopause perimenopause

Why Jet Lag Hits Women Harder

I landed back in New Zealand last week after a month in the US and it’s wonderful to be home, to be back with my family, and to be catching up on sleep. Well, almost. While my body is physically here, my body clock is still somewhere over the Pacific. Jet lag is one of those things that sneaks ...

by Dr. Stacy Sims — May 18, 2026 circadian rhythms hiit hormones hydration jetlag protein sleep supplements

Far From Home, Close to the Work

I left New Zealand on April 12 with a carry-on bag, a full schedule, and the kind of quiet resolve that kicks in when you know you're heading towards work that matters. Two and a half weeks in, I'm somewhere between San Francisco and Los Angeles with a double espresso in hand, a voice that's ta...

by Dr. Stacy Sims — Apr 29, 2026 bones hormones longevity menopause perimenopause strength

Closing the Women’s Health Gap

For a long time—going back to my postdoc days—I’ve experienced firsthand how far women’s health and fitness research lags behind the male-focused default data. It’s become my life’s mission to help fix this, so today I’m extremely proud to announce a new research funding partnership that will h...

by Dr. Stacy Sims — Mar 27, 2026 creatine hormones longevity menopause recipes strength

Why the Female Heart Responds Differently to Exercise

Note: This is an anatomical and physiological review, not medical advice. Anyone with concerns should see their healthcare provider. When you train consistently—whether it’s endurance training, speed work, or strength—your heart adapts. That adaptation, which is often referred to as “athlete’s ...

by Dr. Stacy Sims — Feb 13, 2026 hormones menopause perimenopause training

Strength vs Muscle Size: What Women Need to Know

One of the questions I’m often asked is: How connected are building muscle and building strength? The short answer: they’re related, but not the same. You can increase strength without dramatically increasing muscle, and you can increase muscle without seeing proportional gains in strength. Res...

by Dr. Stacy Sims — Jan 28, 2026 hormones intensity lhs lift heavy muscle strength training

Talking Menopause with Mel Robbins

My latest conversation with Mel Robbins drops today, and it touches on many of the questions I’ve been thinking about as we head into 2026: how women can support metabolism, build muscle, and work with their hormones as they train, recover, and age in a landscape that’s often noisy, trend-drive...

by Dr. Stacy Sims — Jan 15, 2026 hiit hormones intensity longevity menopause menstrual cycle strength tracking

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

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 menstrual cycle period tracking training

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