Fasting for non-religious causes – and whether or not it’s good or dangerous for you – has change into a sizzling subject within the well being and health house. Everybody has an opinion they usually appear to be getting increasingly keen about it by the day.
Bounce into the feedback part of an Instagram put up of fasting and also you’ll see what I imply.
Personally, I get up HUNGRY.
My sister can’t have a look at meals earlier than midday.
I really feel like crap if I don’t eat earlier than understanding.
My pal Jules appears like crap if she does eat earlier than understanding.
Way back to 2019, “intermittent fasting” was one of the searched diet-related phrases on Google and the subject solely appears to have heated up since then.
With all of the hype round fasting, particularly for girls, it’s simple to get caught up within the development. However right here’s the factor: fasting for girls isn’t so simple as it might appear.
After diving into the analysis, my greatest takeaway is that this: Regardless of your opinion on fasting, you’ll possible discover analysis to help your perspective. However in relation to fasting for girls, we have to think about some vital elements, from the analysis gaps to how fasting impacts energetic ladies’s wants for power, muscle restoration, and hormonal steadiness. Right here’s what you need to know.
What Is Fasting, Actually?
Fasting merely means taking a break from consuming (and generally consuming) for a set time frame.
Technically, all of us quick in a single day whereas we sleep—and that fasting window is definitely vital! It provides our our bodies time to relaxation, restore, and faucet into saved power as a substitute of regularly processing new meals. And breakfast is actually the meal once we break the in a single day quick.
This pure “pause” requires that our our bodies burn up glucose and fatty acids circulating in our blood and faucet into power shops. It trains our our bodies to get higher at processing power.
However What About Longer Fasts?
Some individuals deliberately stretch that in a single day quick into an extended break, a observe often known as intermittent fasting (IF). One of the vital fashionable variations is named time-restricted consuming (TRE), the place you restrict your consuming to a selected window – usually round 8 hours (or much less) – and quick the opposite 16 hours of the day.
For instance, you may eat dinner at 6 p.m. after which not have any extra energy till 10 a.m. the subsequent day—so that you just’re fasting in periods of low or decreased exercise.
There’s a Lack of Analysis on Fasting for Ladies
Many of the analysis on fasting has been carried out on males and plenty of have solely been carried out on animals. Individuals who help fasting usually make the leap that findings of these research apply to ladies as properly, however that’s a reasonably large leap as a result of ladies’s our bodies reply in another way than males’s (or mice)—particularly in relation to decreased calorie consumption, our hormonal cycles, and train.
The huge majority of research on fasting for girls concentrate on sedentary ladies and people think abouted obese or overweight. However with small pattern sizes it’s onerous to generalize the findings to energetic ladies and people who should not thought of obese or overweight.
We do see that for many who are inactive or sedentary, research have proven fasting is usually a useful stressor on the system that helps enhance insulin sensitivity, glucose metabolism, amongst different issues.
However in case you are an exerciser or an energetic ladies or in perimenopause, there’s a main hole within the analysis that makes it even tougher to use the present fasting analysis to your life—particularly in relation to understanding how fasting impacts train efficiency and restoration.
Fasting for Weight Loss
The analysis on fasting and weight reduction is kind of clear: on the finish of the day, in relation to weight reduction, fasting is actually only a technique of calorie restriction. Whereas proponents declare fasting has particular metabolic advantages, there’s no strong proof exhibiting that it’s any more practical than different types of calorie management, like portion management, monitoring your meals consumption, or balanced consuming.
Fasting is only a technique of lowering your calorie consumption by utilizing the clock to restrict your consumption. And when calorie consumption is managed for, fasting isn’t higher than different “diets” for attaining long-term weight reduction or well being enhancements.
Fasting and Train
Combining fasting and train is the place it will get difficult—particularly for girls. Primarily, it is because fasting and train do related issues—they each lower your blood glucose and different vital molecules circulating in your blood.
So once you mix them and train whereas fasted, you may find yourself with some points.
First, for each women and men, exercising fasted might make your blood sugar ranges go too low and depart you making an attempt to actually run on an empty tank. No gasoline makes it actually onerous to work out or work out onerous sufficient to get the outcomes you’re after. It might additionally make you dizzy and move out.
Second, fasted train is related to decreased efficiency, elevated fatigue, decreased ability, impaired focus, and an elevated notion of effort (so train feels tougher than it ought to). This makes it much less possible that you just’ll have good coaching periods and even wish to work out.
Moreover, muscle preservation is crucial for total well being and metabolism, and fasting alone could not do the job in addition to different consuming methods that prioritize protein and carbohydrates for muscle restoration and development.
For girls who do select to quick or exercise fasted, it’s vital that they proceed to concentrate on consuming sufficient meals – particularly protein and carbs – all through the day throughout their feeding window to reduce the chance of low power availability and forestall muscle breakdown and loss.
Self-Consciousness: The Key to Making Good Fueling Selections
Whether or not you’re fasting or following one other consuming plan, self-awareness is vital. Everybody’s physique is completely different, and which means tuning into your private wants and the way your weight-reduction plan (and train) impacts your power, temper, and efficiency.
And context issues—so do not forget that it’s not nearly skipping that one meal, it’s about the way you’re balancing your wants throughout the day as properly. So what works for one particular person, could not give you the results you want. And what used to give you the results you want, could at some point now not be acceptable or efficient.
Some ladies thrive on fasting, however many others discover that under-eating or fasting interferes with their exercises and restoration.
Everybody’s physique has distinctive wants, and there’s no one-size-fits-all method.
Once I introduced up the subject of fasting to my colleague, Jules Mitchell, writer of Yoga Biomechanics: Stretching Redefined, she shared how difficult it may be for individuals who weren’t athletes rising as much as acknowledge their physique’s indicators.
“The older I get, the extra privileged I really feel for having performed sports activities as a child and spent my childhood working races. At eight years outdated, I discovered {that a} half banana earlier than a 10k would make me sick. I’ve been taking note of my physique’s indicators my complete life. However when you’re simply now in perimenopause and stepping into train, all of the combined messaging have to be so complicated.”
Her expertise reminds us that self-awareness isn’t nearly noticing what we really feel immediately—it’s about understanding how our our bodies reply over time, by means of completely different phases of life and exercise.
In the event you’re consistently feeling drained, weak, or sluggish throughout your exercises, it is perhaps an indication that you just’re not fueling your physique correctly.
Self-awareness is about listening to your physique and making changes primarily based on how you are feeling, not simply following the most recent development.
Many Lively Ladies Are Typically Underneath-fueled
One of many key factors that always will get missed in relation to fasting for girls is the problem of under-fueling.
Many energetic ladies underestimate their whole day by day power expenditure (due to all these foolish 1200-1500 calorie weight-reduction plan suggestions that we grew up with) and find yourself consuming too little to fulfill their power calls for. That is very true for girls who do common power coaching, high-intensity exercises, or endurance coaching.
A 2016 research carried out on 109 feminine leisure exercisers discovered that 45% had been in danger for low power availability – that’s practically half of the ladies recruited from native gyms and health facilities had been in danger because of under-fueling.
So under-fueling and low power availability aren’t only a concern for “high-level” athletes, any exercising girl could be in danger.
Underneath-fueling can result in poor restoration, decreased efficiency, and even hormonal imbalances. Ladies who practice onerous want to make sure they’re consuming sufficient carbohydrates and protein to gas their exercises and recuperate successfully. With out the right vitamins, your physique can’t rebuild muscle, and chances are you’ll expertise fatigue, temper swings, and hormonal disruptions.
In my work as a private coach serving to ladies with osteoporosis construct and preserve bone mass, most of my discussions with purchasers encompass consuming extra, not much less.
Dietary Therapist Michaela Smith agrees. She shared her ideas with me:
“The overwhelming majority of ladies I work with are under-fueling already, even those that need to shed pounds! Underneath-eating is a big stressor that may manifest into hormonal imbalance, weight adjustments, and even cognitive adjustments.”
In her observe, she typically doesn’t advocate intermittent fasting for girls. Right here’s why:
- Many ladies are already under-eating, which may contribute to anxiousness, mind fog, overwhelm, and hormonal imbalances.
- Fasting can negatively have an effect on blood sugar, resulting in:
- Drops in blood glucose
- Launch of stress hormones
- A rebound spike in blood sugar
- A “blood sugar curler coaster” that leaves ladies feeling off steadiness when it comes to power and meals cravings
- There may be restricted analysis on the results of fasting on ladies, making lengthy fasts a questionable technique.
As an alternative, Michaela recommends the next method to help regular power and hormonal well being:
- Eat a balanced breakfast inside 30–60 minutes of waking.
- Gas constantly all through the day with common meals and snacks.
- End dinner early sufficient to permit time to digest and profit from a mild in a single day quick.
- Purpose for a 12-hour window between dinner and breakfast—this helps power metabolism and intestine well being with out over stressing the physique.
“The long-term outcomes I see with the ladies I work with are extra even power, fewer jittery emotions, improved blood sugar response, and extra secure weight. All wins in my e-book!”
When You Eat Issues, However So Does What You Eat
Whereas timing your meals or solely consuming inside a selected window may appear stylish, it’s extra vital to concentrate on what you eat and whether or not it meets your physique’s wants. Whether or not you’re consuming earlier than or after your exercise, be sure you’re getting sufficient carbohydrates to gas your train and protein to recuperate.
Carbohydrates are your physique’s essential supply of gas for train, and you might want to replenish glycogen shops after exercises. The amino acids in protein are the constructing blocks for all tissue and helps rebuild muscle, preserve bone, and help restoration.
For energetic ladies, this steadiness is essential—regardless of once you eat. It’s all about giving your physique the vitamins it must recuperate and carry out at its finest.
In the event you’re not used to consuming earlier than you’re employed out, however you wish to attempt it, begin small with simply 100 energy of easily-digestible, low-fiber carbs or a sports activities drink to keep away from GI misery. Then, over time progressively improve the energy to coach your system to tolerate meals at the moment of day.
Fasting and Hormonal Well being: A Complicated Relationship
For girls with polycystic ovary syndrome (PCOS), intermittent fasting has proven some promising advantages in bettering insulin sensitivity, regulating blood sugar ranges, and selling hormonal steadiness. A number of research have steered that fasting can cut back insulin spikes, a key difficulty in PCOS, and should assist alleviate signs like irregular menstrual cycles, weight acquire, and zits.
Nonetheless, it’s vital to notice that almost all of the analysis on fasting for PCOS has been carried out on obese or overweight premenopausal ladies and the findings are nonetheless rising. Whereas the outcomes are encouraging, extra analysis is required to know how intermittent fasting impacts ladies with completely different physique sorts and at numerous phases of life, together with those that are energetic and in perimenopause or past.
For energetic ladies, particularly these in perimenopause, fasting can influence hormonal steadiness in ways in which will not be instantly obvious. Low power consumption, particularly when mixed with a number of train, can result in low power availability and/or finally Relative Vitality Deficiency in Sport (RED-S), a situation that impacts reproductive, metabolic, and bone well being. Indicators of RED-S can embrace menstrual irregularities, fatigue, decreased bone density, and poor restoration.
And right here’s the kicker: throughout perimenopause, distinguishing between anticipated hormonal adjustments and the indicators of RED-S could be troublesome.
In the event you’re experiencing fatigue, poor restoration, or irregular intervals (which many ladies received’t even be capable to inform in the event that they’re utilizing contraception that alters their interval), it might be an indication that you just’re not fueling sufficient to help your exercises and total well being.
Enough fueling, particularly with carbohydrates, is particularly vital in midlife to help each coaching and hormonal well being.
Conclusion: Fasting for Ladies—A Customized Method
Fasting may go for some ladies, however it’s vital to do not forget that, in relation to weight reduction, it’s only one technique of calorie restriction and it hasn’t been confirmed to be more practical than different dietary methods.
For energetic ladies, self-awareness and taking note of how you are feeling throughout exercises and restoration are essential. Earlier than contemplating a fasting routine, be certain your physique is well-fueled.
A balanced consumption of carbohydrates and protein is crucial—particularly to help your exercises, restoration, and total well-being. Underneath-eating could make fasting counterproductive—rising stress on the physique slightly than supporting well being.
And when you’re very energetic or an athlete with targets—working towards a PR in your lifts or coaching for a contest or race—chances are you’ll wish to depart fasting within the mud as it will possibly lower your efficiency and inhibit your restoration.
There’s no one-size-fits-all method. The most effective technique is well-thought-out and helps your power, efficiency, and long-term well being—not one which leaves you depleted.
And remember that there’s a rising variety of “docs” and consultants on the market who’re talking about fasting (and cashing in on it) despite the fact that it is rather a lot out of their very own scope of observe. So earlier than diving in head first, make sure you test what sort of physician they’re and confirm that you just solely take recommendation from certified vitamin consultants.
In the event you’re not sure the place to start out, think about getting help from a registered dietitian or nutritionist who focus on working with ladies in your particular inhabitants (energetic, endurance athletes, and/or perimenopausal ladies) to assist tailor a plan that works for you. —Karin
References
- Vitality Professional. (2019). “Intermittent Fasting: A Search Development.” Vitality Professional Diet Statistics. Hyperlink
- Cienfuegos, S., et al. (2022). “Intermittent Fasting and Reproductive Well being: The Potential Results.” Vitamins.
- Correia, M., et al. (2020). “Intermittent Fasting and Cardio Efficiency.” Journal of Sports activities Sciences.
- Batitucci, G., et al. (2022). “The Affect of Fasting on Muscle Mass and Physique Composition.” Frontiers in Diet.
- Zouhal, H., et al. (2020). “Results of Fasting on Train Efficiency: A Overview.” Sports activities Drugs.
- Mellin, A. (2025). “Carbohydrate Availability and Menstrual Well being in Lively Ladies.” Journal of Sport Diet and Train Metabolism.
- Aird, L., et al. (2018). “Fasted vs Fed Train: The Affect on Fats Metabolism and Efficiency.” Worldwide Journal of Sports activities Physiology and Efficiency.
- Slater, J., et al. (2016). “Feminine Leisure Exercisers at Threat for Low Vitality Availability.” Worldwide Journal of Sport Diet and Train Metabolism.
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