Does Fasting Affect Your Menstrual Cycle - The Truth about Intermittent Fasting and Your Period

The Truth About Fasting for Women: Why Most Studies Don’t Apply to Your Cycle

Balancing Hormones Naturally Podcast with Leah Brueggemann

Everyone keeps telling you to fast. Skip breakfast. Push your eating window. Drink coffee until noon. And somewhere along the way, fasting got marketed as the secret to weight loss, balanced blood sugar, and longevity for every human on the planet.

Here is what nobody mentions in those reels: most of the research behind those claims was done on men or postmenopausal women. If you have an active cycle, applying that data to your body without context can quietly tank your hormones, flatten your energy, and wreck your periods.

In this episode, Leah breaks down what fasting actually does to a cycling woman’s body, when it works in your favor, when it backfires, and the one fasting style most women can use safely without sending their adrenals into a tailspin.

What You’ll Learn in This Episode
•        Why fasting research done on men doesn’t translate cleanly to menstruating women
•        How estrogen and progesterone change your insulin sensitivity across your cycle
•        The connection between aggressive fasting, LH pulsatility, ovulation, and progesterone
•        Why intermittent fasting can become a fancy way of chronically under-eating
•        What circadian fasting is, why Leah loves it, and how to do it
•        Follicular fasting: the one-day-per-cycle window where a longer fast may serve you
•        How melatonin and your circadian insulin sensitivity should shape when you eat
•        Why your minerals and vital reserve matter before you ever consider a fast
•        How to break a fast without spiking your blood sugar into the stratosphere

Key Concepts From the Episode
You’re Not a Small Man
Men run on a 24-hour hormonal rhythm. Women run on a 28 to 36-day rhythm. Their dominant hormone is testosterone, which doesn’t tank under stress the way progesterone does. Stretching male fasting protocols across a cycling woman’s body ignores all of that.

Insulin Sensitivity Changes Throughout Your Cycle
Estrogen increases insulin sensitivity. Progesterone decreases it. So depending on where a woman is in her cycle, the same fasting protocol can produce wildly different results. One snapshot in a study cannot capture that.

Aggressive Fasting Can Suppress Ovulation
Calorie restriction taken too far has been shown to lower LH pulsatility within just five days. Lower LH means a weaker ovulatory surge, which means a weaker corpus luteum, which means less progesterone. That cascade shows up as irregular cycles, thinning hair, irritability, low energy, and insomnia long before it shows up on a lab.

Sometimes Intermittent Fasting Is Just Under-Eating in Disguise
Slapping a name on a tiny eating window doesn’t change the math. If the calories aren’t there, the body reads starvation. The early energy boost most women feel? Usually adrenaline. Eventually the bill comes due in the form of stalled fat loss, blunted thyroid function, and worsening cycles.

Circadian Fasting: The Safer Default
Stop eating after dinner and don’t eat again until morning. Roughly a 12-hour window. This honors your natural insulin rhythm (you are more insulin sensitive in the morning, more resistant at night) and supports digestion and blood sugar without spiking cortisol. Most cycling women can use this safely.

Follicular Fasting (One Day Per Cycle)
Pick one day in your follicular phase and pull your final meal earlier (say, 3 pm instead of 6 pm). Estrogen is rising, insulin sensitivity is on your side, and the impact on stress hormones is minimal. One day. Then back to your normal circadian fast.

Mineral Status and Vital Reserve Come First
Fasting on top of depleted minerals and a chronically dieted body is pouring gas on a fire. Replenish first. Mineral-rich foods (yes, including beef liver, not only vegetables) build the foundation that any fasting strategy needs.

Practical Takeaways
•        Eat within 30 to 60 minutes of waking
•        Aim for 30 grams of protein at breakfast
•        Get fiber and low-glycemic carbs in early
•        Never eat a naked carb (pair the apple with a hard-boiled egg or a handful of nuts)
•        Build a dinner that can actually carry you through the night: protein, fat, fiber, low-glycemic carbs
•        Break your fast with protein, not sugar and coffee
•        Prioritize nourishment before restriction every single time
•        Pay attention to mineral intake, especially if you’ve been chronically dieting

A Line Worth Saving
“You don’t need to starve to heal. You need to support your hormones, not suppress them.”

Episode Sponsor: Aversio Wellness Maitake
Mushrooms are everywhere right now, but most products use a fraction of the dosage that was actually studied. Aversio Wellness uses real therapeutic dosages and a strong extraction ratio, so one or two capsules do the job (instead of swallowing a pile of pills).

Their newest standalone product is Maitake, which Leah is calling the new starting point for women who want a mushroom that delivers visible results. Maitake supports blood sugar balance, ovulation, and immune function, and since blood sugar drives basically every hormonal pathway in your body, this one earns its place.

Shop at aversiowellness.com and use code LEAH for 15% off.

Want to Go Deeper?
Grab Leah’s free hormone training and learn her three secrets to balancing hormones naturally:

freehormonetraining.com

Connect With Leah
•        Instagram (personal): @leahbru
•        Instagram (podcast): @balancinghormonesnaturally
•        Free Hormone Training: freehormonetraining.com

Disclaimer: This episode is for educational purposes and is not medical advice. Please work with a qualified practitioner before making changes to your nutrition, fasting practice, or supplement routine.

What is Balancing Hormones Naturally?

Boost your energy, balance hormones naturally, and heal holistically all without uprooting your entire life! Learn the secrets to balancing your hormones at: freehormonetraining.com.

Have you ever tried to Google your symptoms only to slam the laptop shut in frustration? Do you want natural, holistic solutions that actually work? Are you tired of being told that everything is normal, when you know it’s not? Are you ready to take back your health to live your best life? 

In this podcast, you’ll discover why your cycle is so important to your everyday health and how you can use nutrition to help support the rise and fall of your hormones and finally feel truly amazing. We dig deep to understand and heal the root causes of your symptoms so you can achieve lasting results that allow you to live a healthy and balanced life without a life-long pharmaceutical prescription. 

If you're ready to reclaim your energy, learn how to listen to your body, and holistically improve your overall health, you're in the right place! I’ll be sharing my tried and true methods for blood sugar balance, improved sleep quality, weight loss, and increased energy levels so you can live your healthiest life all without unreasonable lifestyle shifts, like restrictive dieting or excessive supplementing.

I’m Leah Brueggemann, a Functional Diagnostic Nutritional® Practitioner and Hormone Health Coach, helping you balance your hormones in effective and realistic ways so you can live a healthier, happier life.

Five years ago, I found out I had fibroadenomas (benign breast tumors), which 90% of the time return after surgical removal. I decided not to undergo the operation and instead found a way to heal the underlying cause. After years of extreme pain, irregular cycles, and ovarian cysts, I finally learned how to balance my hormones which healed my fibroadenomas and led me to regular, pain-free periods. 

I learned how to make lifestyle shifts, remove toxins from my environment, and give my body what it actually needs to function optimally and heal on a cellular level. After my experience, I became a Functional Diagnostic Nutritional® Practitioner so that I can empower women in their own holistic health journey.

Even if you’ve been told your labs are normal or that your symptoms aren’t a cause for concern - YOU are the expert of your body and your experience. You deserve to feel AMAZING, not just “normal”. I’m here to help you achieve optimal overall health through simple, straightforward lifestyle changes that you can start to implement today. 

Balancing Hormones Naturally isn’t just the name of the podcast, it’s the way forward to a happier, healthier life and I can’t wait to join you on the journey! 

Connect with Leah:

📧 Email: [e-mail]

🌐 Website: leahbrueggemann.com

📷 IG: @leah_brueg and @balancinghormonesnaturally

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