When Intermittent Fasting Backfires: What I've Learned Working with Women in Midlife

By Karen Mitchell

Intermittent fasting has become one of the most popular health trends of the last decade. Depending on who you follow, it's touted as the answer for weight loss, blood sugar balance, longevity, hormone health, metabolic flexibility, and even healthy aging.

And for some people, it may be helpful.

In fact, years ago I wrote an article about intermittent fasting that was generally favorable. At the time, I was intrigued by the research and the potential benefits. Fasting has existed throughout human history. Many spiritual traditions have incorporated fasting as a way to connect more deeply with oneself and with spirit. There is also research suggesting that fasting may influence insulin sensitivity, inflammation, autophagy, and other cellular processes.

But over the years, my perspective has changed. Why? Because I began paying close attention to the women sitting across from me in my office.

The women I work with are not usually struggling because they are eating too often. More often, they are exhausted. They're navigating careers, families, aging parents, hormone shifts, digestive issues, autoimmune conditions, poor sleep, and a level of chronic stress that has become so normalized we hardly question it anymore.

And increasingly, I began to notice that intermittent fasting was not helping many of them. In some cases, it seemed to be making things worse. I watched women gain weight while fasting, crash in the middle of the afternoon, wake at 2:00 a.m. unable to get back to sleep, and become more anxious around food rather than less. This is not a good look for intermittent fasting.

The Problem Isn't Fasting. The Problem Is Context.

One of the challenges with nutrition advice is that we often want a simple answer. We want a rule that works for everyone. Unfortunately, bodies don't work that way. We are all unique.

A healthy twenty-five-year-old man with stable blood sugar, good sleep, low stress, and no history of dieting may respond very differently to intermittent fasting than a fifty-year-old woman navigating perimenopause, Hashimoto's, digestive issues, and years of chronic stress.

Context matters.

The body is constantly gathering information from its environment. It pays attention to what we eat, how much we eat, when we eat, how we sleep, how we move, and how much stress we're carrying. What may feel like a beneficial challenge to one body may feel like another demand on an already depleted system.

This is why I have become much more cautious about recommending fasting as a blanket strategy for women. Fasting seems to work great for men, but I don't consistently see that with women.

Why It Makes Me Uncomfortable

One of the reasons I've become more cautious about intermittent fasting is personal.

I spent years learning how to override my body's signals. Hunger was something to ignore. Cravings were something to fight. Fatigue was something to push through.

It took me a long time to learn that those signals weren't weaknesses. They were information.

When I look at some of the messaging around intermittent fasting today, I can't help but notice how familiar it feels.

Women are often encouraged to skip breakfast, ignore hunger, delay eating, push through cravings, and wait until their eating window opens. For some people this may work just fine. But for many women, especially those with a history of chronic dieting, restriction, or disordered eating, these aren't new skills. They're old wounds wearing new clothes.

We've camouflaged chronic restriction into something that sounds healthy and supportive—but is it really any different?

I find myself asking a different question now.

Instead of asking, "How long can you go without eating?" I'm more interested in asking, "What is your body trying to tell you?" And how do we support a body in balance?

What I See in Practice

Many of the women who come to me are already under-fueled and lacking essential nutrients.

They're often relying on coffee to get through the morning. They're eating lunch at their desk or standing up at the kitchen counter. They're grabbing dinner between a packed schedule of work, kids, family activities, and life's endless responsibilities. They're trying to lose weight while simultaneously feeling exhausted, foggy, and overwhelmed.

Many are not eating enough protein. And every single woman I see in practice has some degree of blood sugar instability. Yup, every single one. Many are waking in the middle of the night. Many are dealing with bloating, digestive discomfort, hormone shifts, or thyroid concerns.

When intermittent fasting enters the picture, it often becomes one more thing to manage.

And while some women report feeling better initially, I frequently see a different pattern emerge over time. Energy drops. Cravings increase. Sleep suffers. Anxiety creeps in. The body becomes more stressed rather than less. Weight comes back on. Moods get edgy.

This isn't true for everyone, but I see it often enough that I no longer view intermittent fasting as a default recommendation. It's one I look at for each individual person, case by case.

A Special Note About Thyroid Disease and Autoimmunity

If you have Hashimoto's, hypothyroidism, or another autoimmune condition, I encourage extra caution.

The body already perceives autoimmune disease as a stressor. Adding additional stress through aggressive fasting may not always create the outcome you're hoping for.

This doesn't mean fasting is never appropriate. It simply means that your body deserves a more individualized approach.

I would much rather see someone stabilize blood sugar, improve digestion, optimize sleep, increase protein intake, and support their nervous system before experimenting with extended fasting windows.

What I Focus On Instead

Over the years, I've become less interested in finding the perfect eating strategy and more interested in helping women understand what their bodies are asking for.

Many of the women I work with arrive feeling exhausted, frustrated, and confused. They've tried different diets, cut out foods, followed the latest health trends, and often spent years believing they simply need more willpower or better discipline. What I see instead is a body asking for support.

Sometimes that support looks like improving digestion. Sometimes it's balancing blood sugar so energy becomes more stable throughout the day. Sometimes it's learning how stress is affecting sleep, hormones, and food choices. Sometimes it's simply helping a woman reconnect with her own hunger and fullness cues after years of ignoring them.

The body is remarkably intelligent. When we slow down enough to listen, it often tells us where to begin.

For me, that is a much more interesting conversation than whether someone should delay breakfast until noon.

I want women to feel steady. To have good energy. To sleep well. To trust their bodies again. To understand what helps them feel nourished and resilient.

Those are the foundations I come back to again and again, because they support health whether someone chooses to fast or not.

We Already Fast Every Night

If you are interested in intermittent fasting for your body, it's simpler than you think.

Finish dinner at a reasonable hour. Allow your digestive system to rest overnight. For most, that's at least a 10-hour fast before rising and having breakfast.

For many women, a natural 10–12-hour overnight fast provides plenty of digestive rest without creating unnecessary stress.

More importantly, pay attention.

How do you feel?

Do you have stable energy?

Are you sleeping well?

Are you able to concentrate?

Do you feel calm around food?

Or are you counting the minutes until you can eat again?

Your body's response matters far more than the latest health trend.

The Bottom Line

I don't love the blanket advice we hear about intermittent fasting being the best thing since sliced bread for women.

For many of the women I work with, the answer is not as straightforward as social media would have us believe. The question isn't whether intermittent fasting works. The question is whether it works for you.

After years of watching women override their hunger, push through fatigue, and disconnect from their body's signals, I've become far more interested in helping women rebuild trust in their bodies than helping them extend the time between meals.

Because healing rarely comes from fighting the body. More often, it comes from learning to listen.

Curious About What Your Body Is Telling You?

Inside The Calm Body Project, we explore food, digestion, stress, sleep, movement, and the many ways the body communicates its needs. Together, we reconnect the dots between symptoms, habits, and the body's deeper messages—not through restriction or willpower, but through curiosity, compassion, and sustainable change.

Many women find that as they begin supporting the foundations, they experience more stable energy, calmer digestion, better sleep, improved mental clarity, and a renewed sense of trust in themselves. They stop fighting their bodies and begin working with them.

The goal isn't perfection. It's creating a body that feels more supported, more resilient, and more at home in itself—so you can show up more fully for the people and experiences that matter most.

Want to Start with the Foundation?

Join my newsletter and receive my Blood Sugar Balancing Guide.

There's a reason I give this guide away for free—it's one of the most important foundations of health. When blood sugar is supported, so many other pieces become easier. Better energy. Better sleep. Better mood. Better food choices. Better resilience.

It may not be flashy, but it's one of the most powerful places to begin.

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