Whether it's skipping breakfast or squeezing all your meals into an eight-hour window, intermittent fasting seems to be everywhere right now. Open Instagram or TikTok and you'll find plenty of people calling it the secret to better energy, weight management and overall health.
For some people, it can be a great tool. But there's one thing that often gets left out of the conversation: men and women aren't built the same. So it makes sense that our bodies don't always respond to fasting in the same way either.
If your goal is to feel energised, support your recovery and build habits you can actually stick to, it's worth understanding those differences before deciding whether fasting is right for you.
Fasting isn't one-size-fits-all
Intermittent fasting isn't about what you eat; it's about when you eat. Rather than following a specific diet, it focuses on alternating between periods of eating and fasting. You might have heard of:
- 16:8 (fasting for 16 hours and eating within an eight-hour window)
- 14:10
- The 5:2 diet
-
OMAD (One Meal A Day)
Some people enjoy the structure. Others find it helps reduce mindless snacking or fits more naturally into their day. But just because something works for your friend, your favourite fitness influencer or your colleague doesn't mean it'll work for you.
Whether you're training for a marathon, juggling work and family life or trying to recover from a busy weekend, your nutrition should support your lifestyle, not work against it.
Why men and women respond differently
Hormones are a big part of the reason why men and women can respond differently to fasting.
Women's bodies are naturally more sensitive to changes in energy availability. That's because reproductive hormones are closely linked to whether the body feels it has enough fuel to support its normal functions. When food intake is reduced for long periods, especially alongside high stress, intense exercise or not eating enough overall, the body can recognise this as a period of low energy availability.
Men can also experience hormonal changes during fasting. However, research suggests women may be more sensitive to these changes, particularly during certain stages of life or at different points in the menstrual cycle.
What does the science actually say?
Social media loves simple answers – unfortunately, nutrition rarely works like that. Some studies suggest women may experience changes in hormone balance after relatively short periods of prolonged fasting or significant calorie restriction. At the same time, many women incorporate intermittent fasting into their routine without any noticeable issues.
So who's right? In many cases, both. The reality is that every body is different. Hormones, stress levels, sleep, exercise, overall calorie intake and even where you are in your menstrual cycle can all influence how your body responds.
The science is still evolving, particularly when it comes to women. Rather than asking whether fasting is "good" or "bad", a better question is whether it's helping you feel your best.
Does the menstrual cycle affect fasting?
Women's hormones naturally fluctuate throughout the month, which means energy, appetite and recovery needs can change too.
You might find fasting feels effortless during one phase of your cycle, then much harder the following week. That's completely normal. Some women prefer shorter fasting windows or choose to be more flexible before their period, when hunger often increases and energy levels can dip. Listening to those signals isn't a sign you've failed. It's simply recognising that your body doesn't need exactly the same thing every day.
Signs fasting might not be working for you
Healthy habits should leave you feeling better, not worse. If you're regularly experiencing any of the following, it might be worth reviewing your approach.
- Constant fatigue
- Poor recovery after exercise
- Feeling cold more often
- Difficulty sleeping
- Increased cravings or binge eating
- Mood changes
- Changes to your menstrual cycle
- Reduced training performance
These signs don't automatically mean fasting is the problem. But they could be your body's way of telling you it needs more fuel, more recovery or simply a different approach.
How men can approach fasting
Many men find intermittent fasting fits naturally into their routine, particularly when they're still eating enough overall. The important thing is remembering that fasting isn't a replacement for good nutrition.
If you're training regularly, working long hours or making the most of your weekends, recovery still depends on eating enough protein, staying hydrated and giving your body the fuel it needs.
A few simple habits can make a difference:
- Prioritise protein at every meal.
- Stay hydrated throughout the day.
- Avoid combining long fasts with intense training unless you're eating enough to recover.
- Focus on food quality rather than chasing the longest fasting window.
How women can approach fasting
Women don't necessarily need to avoid intermittent fasting. The key is flexibility. Many nutrition professionals recommend:
- Starting with a shorter fasting window, such as 12-14 hours.
- Eating enough protein, healthy fats and fibre.
- Being flexible around your menstrual cycle.
- Avoiding prolonged fasting during periods of high stress, illness or intense training.
- Paying attention to how you actually feel rather than sticking rigidly to the clock.
Social media often treats longer fasts as a badge of honour but more isn't always better. If fasting consistently leaves you feeling exhausted, affects your workouts or simply doesn't feel sustainable, it may be time to rethink your routine. The best plan is the one you can stick to while still feeling like yourself.
Fasting is only one piece of the puzzle
Whether you choose to fast or not, recovery still matters. Hydration, balanced nutrition, quality sleep and regular movement all play a role in how you feel day to day. No single habit will transform your health overnight, but small, consistent choices often have the biggest impact over time.
Intermittent fasting can be one of those habits if it suits your body and your lifestyle. If it doesn't, that's okay too. The goal isn't to follow someone else's routine. It's to build one that leaves you feeling energised, balanced and ready for whatever life throws at you.