Hormonal Imbalance Weight Gain
For some people, hormonal imbalances can make weight management feel more difficult, even when they are eating well and staying active. Hormonal imbalance weight gain can affect both women and men.
Medically reviewed by Danny Chu, HCPC-Registered Physician Associate (PA38670).
Can Hormonal Imbalance Cause Weight Gain?
Disclaimer: This article is for informational purposes only and does not constitute medical advice. If you are experiencing symptoms of menopause or are concerned about weight gain, please consult your GP.
Yes, underlying hormonal imbalance is a well-recognised cause of unexplained weight gain. Hormones are the body’s chemical messengers. They regulate metabolism, appetite, fat storage and energy expenditure. When your body’s hormones fall out of balance, you may start gaining weight even if your diet and activity levels haven’t changed.
Weight gain from hormonal imbalance often feels different to typical weight gain.
- You may notice it in specific areas, like around the abdomen.
- You may struggle to lose weight despite effort.
- You may have other symptoms, such as fatigue, mood swings, or poor sleep.
Hormonal shifts occur naturally at certain life stages, including puberty, pregnancy and ageing. But certain medical conditions can also disrupt hormones at any age, in both men and women.
Weight Gain Due To Hormonal Imbalance
Common Hormone-Related Conditions Linked to Weight Gain
| Hormone | Imbalance | Weight Effect |
| Thyroid | Low hormone levels (hypothyroidism) | Slowed metabolism, fluid retention |
| Oestrogen | Low hormone levels (menopause) | Abdominal fat gain |
| Oestrogen | High hormone levels (dominance) | Fluid retention, fat storage |
| Insulin | Resistance to the hormone | Excess calorie storage, belly fat |
| Testosterone (men) | Low hormone levels (true hypogonadism) | Reduced lean mass, increased fat |
| Cortisol | Excess hormone production (chronic stress/Cushing’s) | Central/abdominal weight gain |
| Androgens (PCOS) | Elevated hormone levels | Weight gain, insulin resistance |
| Progesterone | Low hormone levels | Raised cortisol, reduced insulin sensitivity |
Thyroid Hormones & Weight Gain
The thyroid gland sits in your neck and controls your metabolism (the rate at which your body burns energy). When it doesn’t produce enough thyroid hormone (hypothyroidism), your metabolism slows down. This can lead to weight gain, fatigue and feeling low.
According to a large UK population study using NHS and ONS data, treated hypothyroidism affected 2.3-3.5% of the British population between 2005 and 2014. The researchers projected that the numbers will rise further.
A 2019 review reported that hypothyroidism is up to 8 to 9 times more common in women than in men. Its prevalence increases with age, particularly in those over 60. The weight gain seen with hypothyroidism is often modest and is largely due to fluid retention rather than fat accumulation.
Treatment: Hypothyroidism is treated with a daily hormone tablet called levothyroxine. With treatment, most people can expect a return to normal metabolism and easier weight management.
Insulin Resistance & Weight Gain
The pancreas produces insulin. Its job is to move sugar from the blood into your cells, where it’s used for energy. When cells stop responding properly to insulin (insulin resistance), sugar stays in the bloodstream instead of being taken up by cells. The body responds by producing even more insulin, which may promote increased fat storage, particularly around the abdomen.
Insulin resistance is strongly linked to weight gain and is a key driver of type 2 diabetes. In the UK, the National Institute for Health and Care Excellence (NICE) has updated its obesity guidelines to include the waist-to-height ratio alongside BMI. This update recognises that abdominal fat carries particular health risks.
Testosterone Decline & Weight Gain in Men
Testosterone supports energy levels, lean muscle mass and fat distribution in men. As testosterone levels decrease due to elements such as age, obesity, or hypogonadism, the body tends to store more fat and lose lean muscle mass.
The relationship between low testosterone and obesity in men is bidirectional, which means each condition makes the other worse. A 2024 study found that for each 1 kg of weight lost over 36 months, total testosterone increased by 0.6% in males.
However, in men whose low testosterone is obesity-related rather than pathological, weight loss itself is the recommended treatment. In some cases, weight loss can restore testosterone levels without medication.
If you’re a man struggling with unexplained weight gain, fatigue, or reduced muscle mass, it’s worth speaking to your GP about a testosterone blood test.
Polycystic Ovary Syndrome (PCOS) and Weight Gain
PCOS is the most common hormonal condition that affects women of reproductive age in the UK. It causes elevated androgen levels (male-type hormones such as testosterone), disrupted ovulation and insulin resistance.
High insulin levels can make the ovaries produce more testosterone, which can worsen hormone imbalance in PCOS. Weight gain can also raise insulin levels, making it harder to control symptoms. Fat tissue also produces extra oestrogen, which can affect ovulation and lead to heavier, irregular periods.
Weight gain linked to PCOS often settles around the stomach and waist. Many women find that even consistent effort with diet and exercise does not produce the results they would expect.
Management: The focus is on lifestyle changes such as physical activity and diet. Some women may also benefit from hormone treatments. NHS guidance states that even a small weight loss can help improve PCOS symptoms.
Menopause, Oestrogen Decline & Weight Gain
During perimenopause and menopause, oestrogen levels decline significantly. This hormonal shift changes where and how the body stores fat. Fat that was previously stored around the hips and thighs begins to accumulate around the abdomen instead. This visceral fat is more metabolically active and carries greater health risks.
Falling oestrogen levels also increase the risk of insulin resistance. Blood sugar regulation becomes harder. When stress is high, the adrenal glands prioritise cortisol production over oestrogen. Some researchers suggest that hormonal and metabolic changes during menopause may contribute to increased abdominal fat storage.
Treatment: Hormone replacement therapy (HRT), lifestyle changes, and dietary support are all recognised options for managing menopausal weight gain. Speak to your GP about what may be an appropriate treatment for you.
Leptin, Ghrelin & Appetite Dysregulation
Leptin and ghrelin are two important hormones involved in hunger and fullness.
Ghrelin rises before meals and signals hunger to the brain.
Leptin, released by fat cells after eating, signals fullness.
In people with healthy appetite regulation, this system works in balance:
Ghrelin rises ↑ → hunger increases
You eat
Leptin rises ↑ → fullness increases
Appetite settles
Obesity and some health conditions can disrupt this system. In obesity, leptin levels are often already high, but the brain becomes less responsive to leptin’s “stop eating” signal. This is known as leptin resistance.
At the same time, ghrelin-driven hunger signals may remain active, which can lead to increased appetite, cravings and difficulty feeling full, even when calorie intake is adequate. Leptin resistance is also closely linked to insulin resistance, and poor sleep may worsen both.
Even one or two nights of poor sleep can increase ghrelin levels and reduce leptin, making people feel hungrier the next day.
Leptin resistance helps explain why hormonal weight gain can feel difficult to manage through willpower alone. Complex biological signalling influences appetite regulation, not simply motivation or self-control.
Cortisol, Stress & Weight Gain
Cortisol is your primary stress hormone, released by the adrenal glands. In short bursts, it’s useful, as cortisol prepares your body for a challenge. But when stress is chronic, cortisol stays elevated for too long, which may affect appetite, sleep and metabolic health.
High cortisol levels reduce insulin sensitivity, increase appetite and promote fat storage in the abdominal area. It can also disrupt sleep, which further disturbs appetite hormones.
In rare cases, where the body produces excessive cortisol, it’s a medical condition called Cushing’s Syndrome that causes significant weight gain.
More commonly, everyday chronic stress keeps cortisol levels persistently raised at a lower level, eventually making weight management harder. Research suggests that addressing sleep and stress can improve weight outcomes.
Managing Weight Gain Due to a Hormone Imbalance
If a hormonal condition is identified, treating the underlying cause is the most important first step. This might mean thyroid medication, diabetes prevention support, sleep apnea treatment, HRT, or other targeted treatment via your GP or specialist.
Alongside medical treatment, the following approaches have strong evidence supporting them.
Healthy Diet
Focus on whole foods like vegetables, healthy fats, lean proteins and fibre
Minimise or avoid ultra-processed food intake, such as refined carbohydrates and added sugars, to support insulin sensitivity and reduce cortisol-driven cravings.
Exercise Regularly
Aerobic exercise (swimming, walking or cycling) and resistance training (weights or bodyweight exercises) improve insulin sensitivity and support lean muscle mass.
Remember, even moderate activity makes a meaningful difference.
Quality Sleep
Try to get 7 to 9 hours of quality sleep per night.
Poor sleep disrupts ghrelin and leptin signalling, raises cortisol levels, and worsens insulin resistance.
Adequate sleep has a measurable impact on hormonal balance.
Manage Stress Levels
Chronic stress keeps cortisol elevated.
Techniques such as mindfulness, breathing exercises and regular movement can reduce cortisol levels and improve metabolic markers.
When to See a Doctor About Hormonal Weight Gain
You should see your GP if you are experiencing unexplained weight gain alongside any of the following symptoms:
- Persistent fatigue or low energy
- Feeling cold all the time, or hair thinning
- Irregular, heavy, or absent periods
- Low mood, brain fog, or difficulty concentrating
- Excess facial or body hair (women)
- Low libido or changes in sexual function (men or women)
- Poor sleep or waking unrefreshed
- Significant abdominal weight gain that doesn't respond to diet and exercise
- Increased thirst, frequent urination, or difficulty managing blood sugar
Your GP may recommend blood tests to assess thyroid function, blood sugar, insulin and hormone levels, depending on your symptoms.
Note: You do not need to have every symptom to seek advice. If something does not feel right, it is worth getting checked.
FAQs
Frequently Asked Questions
Hormonal Imbalance and Weight Gain
Yes. Hormonal changes and imbalances may affect many aspects of women’s health, including menstrual cycles, sleep, mood, fertility and metabolic health.
Yes. Long-term stress may increase cortisol levels, which can affect appetite, cravings, sleep and fat storage in some people.
Many hormones help regulate weight, including insulin, cortisol, thyroid hormones and sex hormones such as oestrogen and testosterone. When certain hormones become disrupted, weight management may feel more difficult.
The endocrine system produces hormones that help regulate metabolism, appetite, blood sugar and energy use. Imbalances within this system may affect overall health and make it difficult to maintain a healthy weight.
In some cases, hormone-related weight gain may be associated with increased risk factors such as high blood pressure, insulin resistance and chronic disease.
People experiencing persistent or unexplained weight changes may benefit from professional assessment and structured weight-management support. Contact Envigore for personalised online weight management support for weight gain due to a hormonal imbalance.
Sources & Further Reading
At Envigore, we believe conversations about weight deserve understanding and reliable information without judgment. Clinical insight, patient perspectives and established medical research guide our content.
For additional context and transparency, explore the medical resources and journal references included throughout this page.
Björntorp P. Do stress reactions cause abdominal obesity and comorbidities? Obes Rev. 2001 May;2(2):73-86. doi: 10.1046/j.1467-789x.2001.00027.x. PMID: 12119665.
Brzozowska, M.M., Bliuc, D., Mazur, A. et al. Sex-differential testosterone response to long-term weight loss. Int J Obes 48, 1481–1488 (2024). https://doi.org/10.1038/s41366-024-01591-7
Christopher A Muir, Gary A Wittert, David J Handelsman, Approach to the Patient: Low Testosterone Concentrations in Men With Obesity, The Journal of Clinical Endocrinology & Metabolism, Volume 110, Issue 9, September 2025, Pages e3125–e3130, https://doi.org/10.1210/clinem/dgaf137
Davis, S., Lambrinoudaki, I., Lumsden, M. et al. Menopause. Nat Rev Dis Primers 1, 15004 (2015). https://doi.org/10.1038/nrdp.2015.4
Dhokte, S., & Czaja, K. (2024). Visceral Adipose Tissue: The Hidden Culprit for Type 2 Diabetes. Nutrients, 16(7), 1015. https://doi.org/10.3390/nu16071015
Ouyang, X., Zhou, Q., Tang, H. et al. Pathogenesis and treatment of obesity-related polycystic ovary syndrome. J Ovarian Res 18, 258 (2025). https://doi.org/10.1186/s13048-025-01817-w
Munshi A, Garg R. Obesity and Menopause: Redefining Obesity – New Guidelines. J Midlife Health. 2025 Jan-Mar;16(1):1-5. doi: 10.4103/jmh.jmh_24_25. Epub 2025 Apr 5. PMID: 40330226; PMCID: PMC12052285.Gokkaya, N., Aydin, K. Efficacy of levothyroxine monotherapy in achieving clinical euthyroidism and its impact on weight loss in women with hypothyroidism and obesity. Sci Rep 14, 27822 (2024). https://doi.org/10.1038/s41598-024-78185-w
Chiovato L, Magri F, Carlé A. Hypothyroidism in Context: Where We’ve Been and Where We’re Going. Adv Ther. 2019 Sep;36(Suppl 2):47-58. doi: 10.1007/s12325-019-01080-8. Epub 2019 Sep 4. PMID: 31485975; PMCID: PMC6822815.
Karine Spiegel, Esra Tasali, Plamen Penev, et al. Brief Communication: Sleep Curtailment in Healthy Young Men Is Associated with Decreased Leptin Levels, Elevated Ghrelin Levels, and Increased Hunger and Appetite. Ann Intern Med.2004;141:846-850. [Epub 7 December 2004]. doi:10.7326/0003-4819-141-11-200412070-00008 Mazza, E., Troiano, E., Ferro, Y., Lisso, F., Tosi, M., Turco, E., Pujia, R., & Montalcini, T. (2024). Obesity, Dietary Patterns, and Hormonal Balance Modulation: Gender-Specific Impacts. Nutrients, 16(11), 1629. https://doi.org/10.3390/nu16111629
Thyroid UK. (2025, July 24). Hypothyroidism – Thyroid UK. Thyroid UK -. https://thyroiduk.org/if-you-are-hypothyroid/about-hypothyroidism/overview-of-hypothyroidism/
Razvi S, Korevaar TIM, Taylor P. Trends, Determinants, and Associations of Treated Hypothyroidism in the United Kingdom, 2005-2014. Thyroid. 2019 Feb;29(2):174-182. doi: 10.1089/thy.2018.0251. Epub 2019 Jan 25. PMID: 30501570.
Singh R, Singh D, Tandon A. Impact of levothyroxine treatment on body weight in drug‑naïve primary hypothyroidism: A hospital‑based prospective cohort study. Thyroid Res. Pract 2025;21:72‑6. DOI: 10.4103/trp.trp_19_25
Van Egmond LT, Meth EMS, Engström J, et al. Effects of acute sleep loss on leptin, ghrelin, and adiponectin in adults with healthy weight and obesity: A laboratory study. Obesity (Silver Spring). 2023;31(3):635-641. doi:10.1002/oby.23616
About Your Clinical Team
This content was medically reviewed and approved by Danny Gian Hou Chu, a HCPC-Registered Physician Associate (PA38670), who oversees all prescribing decisions at Envigore.
All prescriptions are dispensed by Right Medicine Pharmacy, a GPhC-Registered Pharmacy (No. 9012382).
HCPC-Registered Dietitian (DT26570) and British Dietetic Association member, Veronica Giudice, provides nutritional guidance and lifestyle support.
Last medically reviewed: May 2026