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  • Writer's pictureLisa Smith

Are Intermittent Fasting Diets Healthy?

Updated: Apr 15

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Enhancing Health and Promoting Weight Management

Intermittent fasting has gained significant attention in recent years as a popular eating pattern for weight management and overall health. With its potential benefits ranging from improved insulin sensitivity to cellular regeneration, it has piqued the interest of many individuals seeking sustainable and evidence-based strategies for optimising their well-being.

In this blog post, we will delve into the science behind intermittent fasting, explore its potential health benefits, and discuss how it can be incorporated into a balanced lifestyle.

What is Intermittent Fasting?

Intermittent fasting (IF) is an eating pattern that involves alternating periods of fasting and eating. It does not focus on what to eat, but rather when to eat. There are several popular approaches to intermittent fasting, including:

  1. 16/8 or 14-10 Methods: These methods involve fasting for either 14-16 hours and limiting the eating window to 8-10 hours each day.

  2. 5:2 Diet: With this approach, individuals eat normally for five days of the week and restrict their calorie intake to 500-600 calories for two non-consecutive days.

  3. Alternate-Day Fasting: This method entails fasting every other day, with some variations allowing for a limited calorie intake (e.g., 500 calories) on fasting days.

Evidence-Based Health Benefits of Intermittent Fasting:

  1. Weight Management: Intermittent fasting may facilitate weight loss by reducing overall calorie intake and improving metabolic efficiency. Several studies have demonstrated its effectiveness in reducing body weight, body fat, and waist circumference, while preserving lean muscle mass.

  2. Insulin Sensitivity and Blood Sugar Control: Intermittent fasting has shown promise in enhancing insulin sensitivity and reducing insulin resistance. This can lead to improved blood sugar control and a reduced risk of type 2 diabetes.

  3. Cellular Repair and Regeneration: During fasting periods, the body initiates cellular repair processes, including autophagy (the recycling and removal of damaged cells) and increased production of human growth hormone (HGH). These mechanisms have been associated with anti-aging effects and may contribute to the prevention of chronic diseases.

  4. Inflammation Reduction: Chronic inflammation is a key driver of various diseases. Intermittent fasting has been found to reduce markers of inflammation in the body, such as C-reactive protein (CRP).

  5. Brain Health and Cognitive Function: Animal studies suggest that intermittent fasting may support brain health by promoting the growth of new nerve cells, protecting against neurodegenerative diseases, and enhancing cognitive function.

Incorporating Intermittent Fasting Safely:

  1. Individualised Approach: Intermittent fasting is not suitable for everyone. Individuals with certain medical conditions or health problems, such as diabetes or a history of eating disorders, should consult with a healthcare professional before starting intermittent fasting.

  2. Hydration and Nutrient-Dense Meals: During eating periods, prioritise nutrient-dense whole foods to support overall health and provide essential nutrients. Stay hydrated by consuming adequate fluids, including water and herbal teas.

  3. Gradual Implementation: If new to intermittent fasting, it is advisable to start with shorter fasting windows and gradually increase the duration as the body adjusts. Aim for a 6 week trail.

  4. Listen to Your Body: Pay attention to hunger cues and honour your body's needs. If you experience significant discomfort or adverse effects, consider adjusting your fasting protocol or seeking guidance from a healthcare professional.

Intermittent fasting has gained popularity as a scientifically supported approach for weight management and enhancing overall health. Its potential benefits, such as improved insulin sensitivity, cellular repair, and inflammation reduction.

This type of fasting is a promising dietary approach that can provide numerous benefits to midlife women dealing with menopause symptoms, weight management concerns, and the pursuit of healthy ageing. However, it's not a one-size-fits-all solution, and individual experiences may vary.

Fasting and Thyroid Function

Intermittent fasting can influence thyroid function, impacting metabolic health. While some studies suggest potential benefits, prolonged intensive fasting might lead to reduced thyroid hormone production. It’s crucial to implement intermittent fasting with caution and consider individual needs.

Benefits of Intermittent Fasting for Midlife Women

  • Hormone Regulation: IF can help stabilise hormones such as insulin and leptin, which are closely linked to metabolism and appetite control. This can be particularly beneficial for midlife women dealing with hormonal fluctuations during peri-menopause.

  • Weight Management: Many women find it challenging to maintain a healthy weight during menopause. IF can assist in weight management by reducing calorie intake and increasing fat burning. It can also help combat the stubborn belly fat that often appears during this life stage.

  • Improved Metabolic Health: Intermittent fasting has been shown to improve insulin sensitivity, lower blood sugar levels, and reduce the risk of type 2 diabetes—all of which become increasingly important during menopause and as we age.

  • Cellular Repair and Longevity: Fasting triggers a process called autophagy, which is the body's way of cleaning out damaged cells and regenerating new ones. This can support healthy ageing and studies suggest it may even extend lifespan.

Nutritional Therapy and Intermittent Fasting

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A nutritional therapist can provide personalised guidance and support if you want to try intermittent fasting.

Here's how personalised nutrition can help:

  1. Assess Suitability: A nutritional therapist can assess your overall health, medical history, and specific nutritional needs to determine if intermittent fasting is appropriate. They can identify any contraindications or considerations based on your unique circumstances.

  2. Individualised Approach: Intermittent fasting is not a one-size-fits-all approach. It may not be suitable for you. A nutritional therapist can customise an intermittent fasting plan based on your goals, lifestyle, and preferences. They can recommend the most suitable fasting schedule, such as the 16/8 method or alternate-day fasting, and adjust it as needed.

  3. Nutrient Adequacy: During the eating periods, a nutritional therapist can help individuals ensure that their meals are nutrient-dense and well-balanced. They can provide guidance on incorporating a variety of whole foods, including lean proteins, healthy fats, complex carbohydrates, and plenty of fruits and vegetables, to meet your nutrient requirements.

  4. Meal Timing and Composition: Nutritional therapists can provide specific recommendations on meal timing and composition within the eating window. They can suggest strategies to optimise energy levels, manage hunger, and promote satiety during fasting and feeding periods.

  5. Hydration and Supplementation: Adequate hydration is crucial during intermittent fasting. A nutritional therapist can advise on the appropriate fluid intake and recommend supplements if necessary to ensure proper nutrient balance and support overall health.

  6. Monitoring and Adjustments: A nutritional therapist can monitor your progress and provide ongoing support throughout their intermittent fasting journey. They can help identify any challenges or adjustments needed, such as managing side effects, addressing nutrient deficiencies, or modifying the fasting schedule to fit the your needs.

  7. Education and Empowerment: Nutritional therapists play a crucial role in educating people about the science behind intermittent fasting, its potential benefits, and any associated risks. They can provide evidence-based information to help you make informed decisions and empower you to take charge of your own health.

It is advisable to consult with a registered nutritional therapist who can provide personalised guidance based on your unique needs and circumstances.

Book your free health review with Lisa to find out how a personalised nutrition programme can help you. Lisa is a metabolic health and weight loss nutrition specialist based in Manchester , she works online with clients all over the UK and Europe.

DISCLAIMER: The content on this webpage is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your doctor or qualified healthcare provider. Never disregard professional medical advice or delay in seeking it because of something you have read on my website.


Conde-Pipó J, Mora-Fernandez A, Martinez-Bebia M, Gimenez-Blasi N, Lopez-Moro A, Latorre JA, Almendros-Ruiz A, Requena B, Mariscal-Arcas M. Intermittent Fasting: Does It Affect Sports Performance? A Systematic Review. Nutrients. 2024 Jan 4;16(1):168. doi: 10.3390/nu16010168. PMID: 38201996; PMCID: PMC10780856.

Aragon AA, Schoenfeld BJ. Does Timing Matter? A Narrative Review of Intermittent Fasting Variants and Their Effects on Bodyweight and Body Composition. Nutrients. 2022 Nov 25;14(23):5022. doi: 10.3390/nu14235022. PMID: 36501050; PMCID: PMC9736182.

Barati M, Ghahremani A, Namdar Ahmadabad H. Intermittent fasting: A promising dietary intervention for autoimmune diseases. Autoimmun Rev. 2023 Oct;22(10):103408. doi: 10.1016/j.autrev.2023.103408. Epub 2023 Aug 11. PMID: 37572827.

Saeed M, Ali M, Zehra T, Haider Zaidi SA, Tariq R. Intermittent Fasting: A User-Friendly Method for Type 2 Diabetes Mellitus. Cureus. 2021 Nov 8;13(11):e19348. doi: 10.7759/cureus.19348. PMID: 34909309; PMCID: PMC8653959.

Liu S, Zeng M, Wan W, Huang M, Li X, Xie Z, Wang S, Cai Y. The Health-Promoting Effects and the Mechanism of Intermittent Fasting. J Diabetes Res. 2023 Mar 3;2023:4038546. doi: 10.1155/2023/4038546. PMID: 36911497; PMCID: PMC10005873.

Mishra A, Sobha D, Patel D, Suresh PS. Intermittent fasting in health and disease. Arch Physiol Biochem. 2023 Oct 13:1-13. doi: 10.1080/13813455.2023.2268301. Epub ahead of print. PMID: 37828854.

Elsworth RL, Monge A, Perry R, Hinton EC, Flynn AN, Whitmarsh A, Hamilton-Shield JP, Lawrence NS, Brunstrom JM. The Effect of Intermittent Fasting on Appetite: A Systematic Review and Meta-Analysis. Nutrients. 2023 Jun 1;15(11):2604. doi: 10.3390/nu15112604. PMID: 37299567; PMCID: PMC10255792.

Varady KA, Cienfuegos S, Ezpeleta M, Gabel K. Clinical application of intermittent fasting for weight loss: progress and future directions. Nat Rev Endocrinol. 2022 May;18(5):309-321. doi: 10.1038/s41574-022-00638-x. Epub 2022 Feb 22. PMID: 35194176.

Zhu S, Surampudi P, Rosharavan B, Chondronikola M. Intermittent fasting as a nutrition approach against obesity and metabolic disease. Curr Opin Clin Nutr Metab Care. 2020 Nov;23(6):387-394. doi: 10.1097/MCO.0000000000000694. PMID: 32868686; PMCID: PMC8726642.


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