HomeAnswersObstetrics and Gynecologymenstrual disorders

Does prolonged fasting affect the menstrual cycle?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

I was expecting my period on February 22, but it is now March 24, and my period has not started. I have been fasting for the past 24 days. Could fasting be the reason for my delayed period?

Kindly advise.

Answered by Dr. Georges Hany Kozah

Education:

MD

Professional Bio:

Dr. Georges Hany Kozah is an experienced Lebanese Gynecologist with an MD from The Lebanese University Faculty of Medical Sciences (2016) and a Fellowship completed in 2022. Specializing in high-risk obstetrics, advanced ultrasound, oncology, colposcopy, and hysteroscopy, he combines expertise with a patient-centered approach. Passionate about women’s health, Dr. Kozah strives for excellence and optimal outcomes in collaborative, innovative care.

This doctor is not available for online consultations on the platform anymore.

Hello,

Welcome to iCliniq.com.

I understand your concern.

Yes, fasting for an extended period, such as 24 days, can cause delayed periods. This happens because prolonged fasting disrupts hormone levels, particularly estrogen and progesterone, which regulate ovulation and menstruation. A significant caloric deficit or weight loss can signal the body to conserve energy, potentially pausing menstruation. Additionally, fasting can act as a physical stressor, making the body prioritize essential functions over reproduction. Changes in blood sugar and metabolism due to altered eating patterns may also contribute to cycle irregularities. To help regulate your period, ensure you consume nutrient-rich foods when breaking your fast, stay hydrated, and monitor other symptoms.

If your period is delayed by more than two weeks, consider taking a pregnancy test if you are sexually active. If you experience extreme fatigue, noticeable weight loss, or persistent irregular cycles, consulting a doctor is advisable to rule out underlying health concerns.

I hope you are satisfied with my answer. For further queries, you can consult me at iCliniq.

Thank you.

Medically reviewed by iCliniq medical review team
Published At May 21, 2025
Reviewed At May 21, 2025

Education:

MD

Professional Bio:

Dr. Georges Hany Kozah is an experienced Lebanese Gynecologist with an MD from The Lebanese University Faculty of Medical Sciences (2016) and a Fellowship completed in 2022. Specializing in high-risk obstetrics, advanced ultrasound, oncology, colposcopy, and hysteroscopy, he combines expertise with a patient-centered approach. Passionate about women’s health, Dr. Kozah strives for excellence and optimal outcomes in collaborative, innovative care.

This doctor is not available for online consultations on the platform anymore.

Same symptoms don't mean you have the same problem. Consult a doctor now!

2,876Checks completed today
4.7/5User rating
~90 secAverage completion time
Evidence-basedGuideline aligned
Symptom Awareness Builder
Prolonged Fasting and Menstrual Cycle Awareness Builder

Fasting and your period?

Five quick questions help you understand how prolonged fasting might be affecting your menstrual cycle. Get a personalized awareness map of what is typically fine, what to mention to your doctor, and what is worth a call today.

Private and judgment-free. For guidance only, not a diagnosis.

Education:

MD

Professional Bio:

Dr. Georges Hany Kozah is an experienced Lebanese Gynecologist with an MD from The Lebanese University Faculty of Medical Sciences (2016) and a Fellowship completed in 2022. Specializing in high-risk obstetrics, advanced ultrasound, oncology, colposcopy, and hysteroscopy, he combines expertise with a patient-centered approach. Passionate about women’s health, Dr. Kozah strives for excellence and optimal outcomes in collaborative, innovative care.

This doctor is not available for online consultations on the platform anymore.

Listen to related tracks in our music library
Comprehensive Second Opinion

Ask your health query to a doctor online

*guaranteed answer within 4 hours

Disclaimer: No content published on this website is intended to be a substitute for professional medical diagnosis, advice or treatment by a trained physician. Seek advice from your physician or other qualified healthcare providers with questions you may have regarding your symptoms and medical condition for a complete medical diagnosis. Do not delay or disregard seeking professional medical advice because of something you have read on this website. Read our Editorial Process to know how we create content for health articles and queries.