28th May 2024

Women and intermittent fasting: what you need to know

Are you a woman looking to begin intermittent fasting? This dietary programme has gained widespread popularity as an effective approach to weight management and overall health, but its suitability for women has been a topic of debate. Today, we put an end to some of these rumours by picking apart the relationship between women and intermittent fasting. The Fast 800 will look at common concerns and provide expert, science-backed guidance for those considering this unique dietary approach.

Understanding intermittent fasting

The process of intermittent fasting involves cycling between periods of eating and fasting, with various fasting protocols available. The most common methods include TRE, where individuals fast for a set number of hours (for example, 12, 14 or 16) and eat within a time window (for example 12, 10 or 8 hours), and alternate-day fasting, where fasting days alternate with regular eating days. At The Fast 800, we do not recommend alternate day fasting as this can be difficult to maintain.

By restricting the time window for eating, intermittent fasting encourages the body to tap into stored fat for energy, leading to potential weight loss and other health benefits.It works by changing the body’s hormone levels to facilitate weight loss. During fasting periods, when glucose levels are lower, the body will use stored fat for energy instead of glucose. The metabolic switch helps break down fatty acids, leading to increased oxidation and weight loss. Intermittent fasting will also increase the levels of human growth hormone (HGH), which is a hormone that can promote fat loss, muscle preservation and overall metabolic health.

What are the benefits of intermittent fasting for women

  • Weight management: Intermittent fasting for women can help achieve weight loss and fat loss goals by creating a calorie deficit and promoting fat burning. Studies have shown that intermittent fasting can be as effective as traditional calorie restriction for weight loss, with some women experiencing greater adherence to fasting protocols due to their flexibility.1
  • Improved metabolic health: Female intermittent fasting may improve insulin sensitivity, blood sugar control, and lipid profiles. This reduces the risk of metabolic disorders such as type 2 diabetes and cardiovascular disease. By allowing insulin levels to drop during fasting periods, intermittent fasting helps regulate blood sugar levels and promotes the usage of stored fat for energy.2
  • Enhanced brain function: Some individuals experience cognitive benefits, including improved focus, mental clarity, and mood stabilisation, with female intermittent fasting. Research suggests that fasting may stimulate the production of brain-derived neurotrophic factor (BDNF), a protein that supports brain health and function. Increased BDNF levels have been associated with enhanced cognitive function and protection against neurodegenerative diseases such as Alzheimer’s.3

Women and intermittent fasting – What are the considerations?

While there are several benefits of intermittent fasting for women, it isn’t without its considerations. Taking time to understand these thoroughly before practising will help in ensuring a safe, effective fast:

Hormonal changes

Women’s hormone levels fluctuate throughout the menstrual cycle, which may impact energy levels, hunger, and mood during fasting periods. Some women may find fasting more challenging during certain phases of their cycle, while others may experience increased hunger or cravings. Listening to your body and adjusting your fasting approach is essential.

Reproductive health

Some women may experience disruptions to their menstrual cycle or reproductive health with prolonged fasting or significant caloric restriction. Amenorrhea, or the absence of menstruation, can occur in women who engage in excessive exercise or calorie restriction, which may affect fertility and bone health.4 If you notice any irregularities in your menstrual cycle or reproductive health, consider modifying your fasting protocol or consulting with a healthcare professional.

Tips for women interested in intermittent fasting

If you’re a woman considering intermittent fasting, here are some tips to help you get started:

  • Start slowly: Begin with shorter fasting periods and gradually increase the duration as your body adjusts. Experiment with different fasting protocols to find what works best for your lifestyle and preferences.
  • Listen to your body: Pay attention to hunger cues, energy levels, and mood fluctuations during fasting periods. If you experience dizziness, weakness, or other adverse effects, consider modifying your fasting schedule or meal timing. It’s essential to prioritise your wellbeing and adjust your approach accordingly.
  • Prioritise nutrition: Focus on nutrient-dense, whole foods during eating windows to ensure you’re meeting your nutritional needs. Include plenty of protein, healthy fats, fibre, vitamins, and minerals in your meals to support overall health and wellbeing.
  • Stay hydrated: Drink plenty of water, herbal tea, or other non-caloric beverages throughout the day to stay hydrated, especially when fasting. Proper hydration is vital for overall health and can help alleviate hunger and prevent dehydration.
  • Be flexible: Intermittent fasting doesn’t have to be rigid or all-or-nothing. Experiment with different fasting protocols and find what works best for your body and lifestyle. Remember that consistency is key, but listening to your body’s signals and adjusting your approach as needed is important.

Ready to begin your weight loss journey?

While intermittent fasting for women can offer numerous benefits, it’s essential to approach it mindfully and consider individual needs and circumstances. By listening to your body, prioritising nutrition, and seeking guidance from healthcare professionals as needed, women can incorporate intermittent fasting into their lifestyle safely and effectively. Whether you’re looking to lose weight, improve metabolic health, or enhance overall well-being, intermittent fasting can be a valuable tool when approached thoughtfully and responsibly.

Ready to learn more about weight management and intermittent fasting? Discover how The Fast 800 weight loss programme can support your health and wellness goals with science-based guidance and personalised support.

Women and intermittent fasting – Frequently Asked Questions

How can women manage hunger and cravings during fasting periods?

Managing hunger and cravings during fasting periods can be challenging, but there are strategies to help. Firstly, staying hydrated by drinking water, herbal tea, or black coffee can help curb hunger. Consuming high-fibre foods during eating windows can also promote feelings of fullness and reduce cravings.

How important is it to incorporate healthy fats and protein into your diet?

Incorporating healthy fats and proteins into meals helps stabilise blood sugar levels and prevent sudden spikes and crashes in energy, which can lead to cravings. Our weight loss shakes are a great way to quickly and easily get the nutrients you need when fasting. They’re filled with natural fibre and protein that will help your body feel full, providing you with the energy you need.

How should women adjust their fasting schedule during different phases of their menstrual cycle?

Women may need to adjust their fasting schedule based on the different phases of their menstrual cycle. During the follicular phase (days 1-14), when oestrogen levels are rising and energy expenditure increases, some women may find it easier to fast. However, during the luteal phase (days 15-28), when progesterone levels rise and energy expenditure decreases, some women may experience increased hunger and cravings, making fasting more challenging.

During this phase, it may be beneficial to shorten fasting windows or incorporate more nutrient-dense foods to support energy levels and manage hunger. Listening to your body and adjusting your fasting schedule can help ensure a more sustainable fasting experience throughout the menstrual cycle.


Ju Young Kim. Optimal Diet Strategies for Weight Loss and Weight Loss Maintenance. J Obes Metab Syndr. 2021 Mar 30; 30(1): 20–31. doi: 10.7570/jomes20065. PMID: 33107442.

Teresa Vanessa Fiorentino. Intermittent Fasting and Metabolic Health. Nutrients. 2022 Feb; 14(3): 631. doi: 10.3390/nu14030631. PMID: 35276989.

Teresa Vanessa Fiorentino. Effects of Intermittent Fasting on Brain Metabolism. Nutrients. 2022 Mar; 14(6): 1275. doi: 10.3390/nu14061275. PMID: 35334932.

Taraneh Gharib Nazem, BA* and Kathryn E. Ackerman, MD, MPH†‡. The Female Athlete Triad. Sports Health. 2012 Jul; 4(4): 302–311. doi: 10.1177/1941738112439685. PMID: 23016101.

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