Intermittent Fasting: Why Women Should Fast Differently than Men

Click here to subscribe:

Intermittent fasting: why women should fast differently than men – Thomas DeLauer

Wherever you look on the Internet, someone will tell you that fasting is terrible for women. They will tell you that your thyroid will be destroyed. They will tell you that your hormones will be completely out of control and you will never recover.

Well, it's not quite true. In this video, I want to give you the breakdown from A to Z of what happens to the female body during a fast, particularly during intermittent fasting. How often should a woman fast? What can you expect? What is happening to your hormones and what is happening to your reproductive system? In this video, I'm going to take it from A to Z of what happens, starting with starvation and appetite hormones, which leads to reproductive hormones and then to the thyroid. We are going to submerge, and men, this video is for you too, because it will also help to describe exactly what is happening in your body.

Okay, this is the thing. When it comes to hormones of starvation … we are talking about leptin, ghrelin, insulin, things so we should pay attention when it comes to hunger and satiety … women are much more sensitive to them. It's not bad, nothing happens to them. It is simply a protection mechanism. It is not the fact that the thyroid closes. It is the fact that the female body is recognizing that no food comes in, so they do not want to produce eggs. They do not want to be ovulating. It's natural. Why would a female body want to produce eggs to stimulate potential reproduction if they are not eating, if they are starving?

That's where all this starts. Everything has to do with leptin, ghrelin and insulin. But it goes much more than that. We are going to talk about what is happening with the brain and with the gonads now.

Let's talk about GNRH. GNRH is a particular thing secreted by the hypothalamus in both men and women, and has to do with what is called the hypothalamic-pituitary gonadal axis. I know many guys who are proud of the HPTA, thinking that it only has to do with testosterone and their male bodies. Oh no. That is not the case. The axis of the HPTA, all that process, are men and women. And that's how it works.

Your brain has an area called the hypothalamus. This hypothalamus ends up secreting something known as GNRH. This GNRH tells the pituitary gland to produce luteinizing hormone and the follicle-stimulating hormone. What these hormones end up doing is triggering the production of sperm and testosterone in men and producing ovulation and triggering progesterone and estrogen in women. They both do the same, only with a different end result. We still have the same catalyst, the same hormones.

Now what ends up happening is how women go through this process compared to men. Now that we know about GNRH and understand that the HPTA has to do with men and women, we can talk about the GNRH precursor, which is where the problem really begins, and that is something called kisspeptin. Where the problem with kisspeptin occurs is just that people do not know what is really happening. Most of the beef in the fasting community and most of the beef with women who fast in general, all have to do with kisspeptin.


1) Intermittent fasting for women, what you need to know to avoid hormonal imbalance. (2017, May 17). Obtained from
2) Intermittent fasting for women: important information you need to know. (2015, March 25). Obtained from
3) The diet of intermittent fasting dietary restriction negatively influences reproduction in young rats: a study of the hypothalamic-pituitary-gonadal axis. (2013, January 29). Obtained from
4) Trepanowski JF, et al. (North Dakota.). Effect of alternate days fasting on weight loss, weight maintenance and cardioprotection among metabolically healthy obese adults: a randomized cli … – PubMed – NCBI. Obtained from
5) Heilbronn LK, et al. (North Dakota.). Glucose tolerance and expression of the skeletal muscle gene in response to the alternate day fast. – PubMed – NCBI. Obtained from
6) Fasting and Thyroid. (North Dakota.). Retrieved from

Video credits to Thomas DeLauer YouTube channel

  • Your reaction?
    Angry Angry
    Lol Lol
    Love It! Love It!
    Love It!
    Nice Nice
    Now I Know Now I Know
    Now I Know
    Sad Sad
    Surprised Surprised
    Wow! Wow!

    Intermittent Fasting: Why Women Should Fast Differently than Men

    Comments 30

    1. Can you kindly make a video for women with PCOS, as to how to fast, types of exercise and best diet. Thank you Thomas

    2. So. When you’re talking about intermittent fasting, what length are you talking about. You said women shouldn’t do it everyday… so I’m not sure what length. A lot of time, not on purpose, but my natural schedule I eat at 6:30 pm then don’t eat till about 8 the next morning. Would that be “fasting”? Or is the just a normal interval of eating? Could this affect my hormones?

    3. Hi Thomas. Great video, thank you for explaining this. I'm kind of weird in that I have had both a thyroidectomy and a complete hysterectomy, yay me! I"m assuming then that I won't expect to experience these changes? I'm on both thyroid replacement, and hormones. Some days I make it 16-17 hours no problem, other days I'm starving at 11 hours. Any advice?

    4. So if I don't want to reproduce (by choice) and don't really care about feeling a bit cold or moody, then IF has no negative effect on me on the long run? (btw men don't get moody when hungry?)

    5. Its amazing.. just incredible. Religiously, we fast 2 days a week voluntarily.. . We also do 3 days fast once a month when its a full moon. But what is interesting is we do once a month fast but women get to break their fast for 7 days – during the menstrual cycle. This has amazed me because to have research back up religion is incredible.. I always complained why I had to break my fast in Ramdhan.

    6. Sorry, but you made me not interested in this anymore. Wish you would make it sweet and simple, but ty for trying. 🙂

    7. Great video. Thank you. I was wondering if the reduction in chances in pregnancy is a long term/permanent effect from fasting or will your hormones go back to normal once you’re no longer fasting?
      Thank you!

    8. I have experimented with Intermittent Fasting for years. I would choose Fasting EVERY time, I feel SO much better following a daily eating window & my appetite has naturally balanced out! I eat Whole Foods not junk, so healthy eating certainly plays a huge part too!

    9. How is IF affected in females without a thyroid? Mine was removed due to thyroid cancer…I've been doing 18:6. Early 40s in age.

    10. I have pcos and if 22/2 it actually regulated my period and I haven’t had that since I was 18 It also helped me lose 60 lbs in 6-7months

    11. Glad I found your channel I suffer from under active thyroid. I don’t know where to start to lose weight. Any suggestions?

    12. So what about us 50+ women? Does this worsen menopause, or improve it? I did a 10 day water fast with great results. I kicked my sugar addiction and eat so much better than before. Although next time I need to watch my electrolytes more, had to break it because they were imbalanced.

    13. Yeah I call bs. I’ve been eating OMAD for 10 years and currently having my second child, both kids conceived on the first try so I’m pretty sure my reproductive system is on point.

    14. So every time I fast I get pretty sick.. I'll do ok while I fast, but as soon as I eat something I crash and get soooo fatigued and get head aches. Is this normal?

    15. This information makes me feel better.. about 3-4 days a week, I feel great eating in an 8 hour window. On weekends, I often eat in a 4 or 1 hour window… but some days I wake up and I just don’t feel like delaying my meals. It feels stressful to my body and mind, particularly before my cycle. It’s good to see so many people in the comments who have had so much success fasting daily, but I find it’s not feasible for me and it used to make me feel like I lacked self control. But Now I have some background knowledge on why my body doesn’t seem to want fasting every day. Thanks!

    16. Awesome video. Now I don’t feel as bad from breaking my fast. Thank you for such thorough insight and scientific study articles to back up theory

    17. What would you recommend to people that take medication regularly? One of mine irritates my stomach if I take it without any food?

    Comments are closed.

    log in

    reset password

    Back to
    log in