MyMT™ Blog

5 Reasons for your Weight Gain in Menopause and Post Menopause.

Weight issues in Menopause
"If your waist is ‘thickening’, your body-shape is changing and you are going into or through menopause, let me explain why!"
[Dr Wendy Sweet, (PhD) Women's Healthy Ageing Researcher]

I invite you to watch my Science of Weight Gain in Menopause video if you would like a summary or if you prefer reading in a little more depth, then please scroll down to read my 5 Reasons for Weight Gain in Menopause and Post-menopause article below. 


Play Video

Understanding that menopause is not ‘just’ about our ovaries is an important concept for women. This is because the decline in oestrogen and progesterone during this life-stage affects target tissues and organs all around the body. 

Our menopause transition is the start of the natural transition into our ageing years. As such, there are numerous changes to different structures around the body, including our heart, blood vessels, liver, gut, muscles, nerves skin and yes, our brain.

When I learnt this myself, my mission to untangle what was really going on with our menopause weight gain began. I hope you enjoy learning about this in my article below.

Oestrogen Target Tissues Slide

Poor sleep, changing liver health, nutrition and exercise advice that isn’t specific to midlife women, and the fact that as we lose oestrogen and progesterone we also lose muscle tone and size too – all of these factors impact our sleep, thyroid and blood sugar hormones as well as our liver health, contributing to weight gain in menopause.

It’s why, our menopause transition, which is the biological gateway to our ageing, leaves us vulnerable to other health changes in mid-life. 

If you are putting on weight that you are struggling to manage, then please have a read of the 5 main reasons I attribute to menopause weight gain.  

5 Reasons for your Menopause (and Post-Menopause) Weight Gain  

1. NOT SLEEPING – Incredibly, because of our changing hormone levels in menopause, we can add 1-2 kg a week during menopause when we can’t sleep. Thanks to a Swedish study of 400 middle-aged women who recorded shortened sleep duration and weight gain, this is better known. (Theorell-Haglow et al, 2010)

The problem is, that not sleeping is the slippery slope towards weight gain as we age. When we lose our precious deep sleep between 2-4am, then much of this weight becomes dangerous fat that goes on our belly and under our diaphragm.  As I often say to women who are trying to exercise off their weight gain, “If you aren’t sleeping, then you aren’t losing.” 

When it comes to reversing weight gain in midlife, a good night’s sleep is the answer instead. I know that’s easier said than done when you’re suffering from hot flushes, night sweats, having to get up and pee, or restless legs and joint pain.

But when you’re awake night after night, this means that your glucose-carrying hormone called insulin, remains higher than usual overnight.

So too, does your stress hormone called cortisol.

When this happens, this interferes with both melatonin and another sleep hormone called Adenosine. 

As sleep deprivation accumulates, it can increase the risk of heart problems, anxiety and depression; resulting in even more sleepless nights and worsening night sweats. Because of this, my sleep module is the first module that you receive.

I place a great emphasis on understanding exactly what to do to turn around your circadian rhythm and pituitary production of melatonin, that is specific to menopause.

2. OESTROGEN DOMINANCE – Have you heard of this condition? I know that I hadn’t when my weight blew out to an all-time high as I arrived in my late 40’s and early 50’s. 

When menopause hormonal changes arrive and women don’t adjust their lifestyle to suit these changes, our fat cells can turn towards storing any excess oestrogen that arrives from our diet and hormone-agents in the environment. 

When this happens, there is more oestrogen stored in our fat cells and this ‘dominates’ the internal environment. As oestrogen becomes the dominant hormone and our liver isn’t clearing excess oestrogen efficiently, the role of progesterone changes too. 

This is why liver health is important to weight management as well as glucose (blood sugar) regulation. We clear excess oestrogens via our liver and during menopause, our liver changes in structure and function as part of our normal biological ageing of our organs. I talk about this in my video below, so please scroll down when you have time and have a listen. 

3. MUSCLE LOSS –  When we begin to lose muscle, our metabolism drops off. Skeletal muscle has the most effect on our metabolism. Muscle loss is highest for women during menopause and the rate accelerates when we aren’t sleeping or we have stopped being physically active because our joints and muscles are sore (I know this all to well myself). Losing muscle means that we don’t ‘burn’ as many calories as we used to either. This muscle loss is normal and is a condition called sarcopenia.

But the effect of this is that we lose mitochondrial cells which are the location for fat-burning and energy production in our body. So, focusing on restoring energy levels, joint function and some aerobic exercise, especially good old fashioned walking is an important part of the MyMT™ Transform Me weight loss programme

4. LOW VITAMIN D LEVELS  – Declining oestrogen levels may cause low Vitamin D levels, which increases fat storage. Our skin is our largest organ and is full of oestrogen receptors. Vitamin D is a fat-soluble vitamin and is produced in the skin with the help of oestrogen.

Therefore, many women are at risk of low vitamin D levels and because Vitamin D is now recognised as a hormone, low levels have an effect on other hormones in the body too. This is due to the feedback system that operates with all of our hormones. 

When Vitamin D is low, hot flushes are increased and memory loss/ foggy brain becomes worse. We also experience more muscle soreness because Vitamin D is involved in the production of calcium and our bones and muscles require calcium to help them to remain strong.

Vitamin D is such a powerful hormone for women to monitor in menopause because it is also implicated in melatonin production. This is our sleep hormone, and when Vitamin D levels are low, our insomnia increases and our mood hormone, serotonin, is reduced.

Serotonin works with dopamine to help our mood and motivation. So, if you are on menopause-related anti-depressants, then ask your Doctor to also check your Vitamin D levels too.  Restoring Vitamin D and sleep is crucial to your ongoing health and weight. 

5. HIGH STRESS LEVELSMy number 5 reason, is for you not to forget that even though you still ‘feel young’, your internal cells, tissues and organs are ageing. This means that our body doesn’t resist stress as well as it used to, so blood pressure, heart rate and temperature go up more readily when we are feeling stressed and overwhelmed as we continue our busy lives.

Some stress is good for us, but the problem in our menopause transition is that too much stress (and this includes from not sleeping and/ or too much exercise) increases cortisol levels. This powerful hormone is one of your stress hormones but it works in conjunction with melatonin, your sleep hormone.

Too much stress (emotionally and physically) interferes with your sleep, your liver health and your gut health. All of these factors combined contribute to your insulin levels staying high and you resist overnight fat-burning. It’s a vicious cycle as so many women find.

  • Not sleeping
  • Changing liver and gut health
  • Loss of elasticity in our blood vessels
  • Muscle loss 
  • Sore joints and
  • Stress from our busy lives

All of these factors interact to create the ‘perfect storm’ for weight gain during our menopause transition and of course, our metabolic health and energy levels may then start to decline  as well.

Menopause Weight Gain

Is MyMT™ for you? I hope so! 

Thousands of women have joined me on the MyMT™ online programmes over the past decade and if you are struggling with either your weight, symptoms, or healty changes and you want to feel supported to change your lifestyle according to my scientifically-evidenced programmes, then join me! 

There is never a better time to start, but if you are hesitating, then I recommend you complete the MyMT™ Symptoms Quiz, watch the revised and updated MyMT™ Masterclass on Menopause, go to the Testimonials and Success Stories on the MyMT™ website and find someone like you to read their story. 

MyMT™ 12 week programs are normally available for NZ$399 each, but by using the promo code JOIN MYMT you will secure savings of NZ$50 making this powerful world-class programme, NZ$349*. Part payments are available for you to select from too.

[*approx.  AUS$363| €220| £165| CAN$283 | US$206]

I hope you can join me when you are ready. 

Dr Wendy Sweet, (PhD), Member: Australasian Society of Lifestyle Medicine/MyMT™ Founder & Coach


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  • Kendall, B. & Ester, R. [2002]. Exercise-induced muscle damage and the potential protective role of estrogen. Sports Med., 32 (2), 103-123
  • Lerchbaum, E. [2014]. Vitamin D and Menopause: A review. Maturitas, 79, 3-7.
  • Lombardo M, Perrone MA, Guseva E, et al. Losing Weight after Menopause with Minimal Aerobic Training and Mediterranean Diet. Nutrients. 2020;12(8):E2471. Published 2020 Aug 17. doi:10.3390/nu12082471
  • Moudi, A. [2018]. The relationship between health-promoting lifestyle and sleep quality in menopausal women. Biomedicine, 8(2), 34-40.
  • Rizzi, M. [2016]. Sleep disorders in fibromyalgia syndrome. J. of Pain & Relief, 5:2.
  • Ryan, M. Itsiopoulos, C. et al. (2014). The Mediterranean diet improves hepatic steatosis and insulin sensitivity in individuals with non-alcoholic fatty liver disease. Journal of Hepatology, 59(1), 138-143.
  • Santosa, S. & Jensen, M. (2013). Adipocyte fatty acid storage factors enhance subcutaneous fat storage in postmenopausal women. Diabetes, 62,3, 775-782, ProQuest Central.
  • Szymczak-Pajor I, Miazek K, Selmi A, Balcerczyk A, Śliwińska A. The Action of Vitamin D in Adipose Tissue: Is There the Link between Vitamin D Deficiency and Adipose Tissue-Related Metabolic Disorders? Int J Mol Sci. 2022 Jan 16;23(2):956. doi: 10.3390/ijms23020956.
  • Theorell-Haglow, J., Berne, C. et al (2010). Associations Between Short Sleep Duration and Central Obesity in Women. Sleep, 33(5), 593 – 598

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