It seems like so many fitness influencers swear by intermittent fasting. The promise is appealing with the benefits of burning more fat, improving metabolic health, and feeling your best.
Like many wellness trends, I decided to try it myself when it started gaining popularity. At first, I noticed less bloating. But I also found myself feeling low on energy in the afternoons and thinking about food more than I wanted to. Combined with an active lifestyle, fasting felt more stressful than supportive.
As someone with a history of an eating disorder, I also realized that strict eating windows weren't the best fit for me. The focus on delaying meals, ignoring hunger cues, and constantly thinking about when I could eat started to feel uncomfortably familiar. For some people, that restriction can lead to feeling overly hungry later on, making it harder to maintain a balanced relationship with food.
So I stopped.
What I learned is that much of the research behind intermittent fasting was done on men. And women's bodies often respond very differently. For some women, fasting can be a helpful tool. For others, it can leave them feeling depleted, anxious, or noticing changes in their cycle. The difference isn't about discipline and how well your control is. It's about understanding what works for your body.
Why Men and Women Respond Differently
When scientists study fasting, they mostly study men. Their bodies handle longer fasts more easily. They're also less sensitive to stress hitting their hormones.
Women are different. Our hormones are highly responsive to factors like sleep, stress, exercise, and food intake. Fast too long and your body may interpret it as a stressor. When that happens, stress hormones rise, reproductive hormones can be affected, and your body shifts its focus toward conserving energy.
That's not a flaw. It's your body doing exactly what it's designed to do.
What Happens in Your Body When You Fast
Fasting naturally increases stress hormones, and that's not necessarily a bad thing. In the short term, it's a normal response. The challenge is when fasting gets layered on top of everything else you're already managing, work stress, intense workouts, poor sleep, a busy schedule.
For some women, that additional stress load can be enough to push the body into a state where recovery, energy, and hormone balance start to suffer. You might notice afternoon energy crashes, changes to your cycle, trouble sleeping, or feeling more anxious than usual.
This is why popular fasting protocols like 16:8 don't work the same way for everyone. While some women thrive on them, others find that a long fasting window creates more stress than benefit.
So Why Does It Work for Some Women?
This is where it gets interesting. Because there is new research out and fasting can benefit some women.
A recent study looked at women with PCOS, which is a condition where testosterone levels run high and hormones are can become chaotic. When these women ate within a six-hour window, their testosterone dropped. And their other hormones stayed stable. For them, fasting actually helped.
But for women with normal hormones who might be stressed, gets poor sleep, and juggling a lot? That same six-hour window might completely tank your energy and stress-load.
How to Know If Fasting Is Right for You
If you want to try fasting, start with 12 hours. Not 16:8. Think dinner at 7 PM and breakfast at 7 AM. For many women, this provides structure without creating unnecessary stress on the body.
Then pay attention to how your body responds. Your energy? Your workouts feel? Your sleep? You mood? How do you feel overall?
If you're already juggling a demanding job, intense training, poor sleep, or a lot of life stress, longer fasting windows may not be doing you any favors.
The Signs You're Overdoing It
If you notice any of these signs, it may be worth re-evaluating your approach:
Your period changes or disappears. This is often one of the clearest signs your body isn't getting the support it needs.
You're losing hair. Increased shedding can be a signal that your body is under stress.
You're exhausted all the time. Not the good tired after a workout. I mean the kind of tired that doesn't get better with sleep.
You feel anxious or moody in ways you didn't before. Hormonal shifts often show up in your mood before they show up anywhere else.
Sometimes the best thing you can do is take a step back and give your body more consistency, nourishment, and recovery.
If Fasting Isn't Your Thing, There Is Alternatives
Not every wellness trend works for every body and that's fine. Instead, focus on habits that support your body rather than stress it.
Intuitive eating. It's eating when you're hungry and stopping when you're satisfied. No time windows. No counting. Just actual hunger cues.
Eat three solid meals. Prioritize protein, healthy fats, and quality carbohydrates. Consistency often works better than restriction.
Nutrient timing based on your cycle. Energy needs change throughout the month. Some phases naturally support harder training and longer gaps between meals, while others benefit from more recovery and nourishment.
Movement-based approach instead. Walk, do Pilates, swim, dance. The goal isn't to burn calories. When you move from a place of feeling good instead of burning off what you ate, everything shifts.
These approaches may not be as trendy as fasting, but they're often far more sustainable.
The Takeaway
Fasting isn't bad. It's just not the magic solution social media sometimes makes it out to be. For some women, it works beautifully. For others, it creates more stress than benefit.
The goal isn't to follow a method perfectly. It's to find an approach that leaves you feeling energized, supported, and at home in your body.
Because at the end of the day, your body will always tell you what it needs. The challenge is learning to listen.