This article discusses
PCOS is a complex endocrine (hormonal) condition that affects 8-13% of women of child-bearing age. PCOS is often driven by higher-than-normal levels of “male hormones”, known as androgens, in women.
What causes PCOS
The exact cause of PCOS is not known, however, a combination of lifestyle and genetics appears to play a role. If your mother has PCOS, your risk of having PCOS increases. It is widely accepted that insulin resistance, increased levels of insulin and androgens drive PCOS.
Insulin is the hormone that allows glucose (the sugar that your body uses for energy) to enter your cells. If you become insulin resistant (as is the case for many PCOS women), it means your insulin is not working as well. To compensate (i.e., drive glucose into your cells), your body produces even more insulin.
This increase in insulin drives your ovaries to more testosterone than needed, which causes many of the symptoms observed in PCOS
The hormonal changes observed in PCOS lead to are several symptoms that can affect various body systems.
Hair, Skin and Body: Excessive body hair (hirsutism), acne, male pattern baldness, weight gain and difficulty losing weight
Periods and fertility: Irregular, infrequent or no periods, multiple follicles on your ovaries, difficulty becoming pregnant and increased risk of complications (however, having PCOS doesn’t make you infertile)
Psychological health: mood changes, increased risk of anxiety and depression, lower self-esteem, disordered eating
Long term health conditions
Regardless of BMI, ethnicity, or age, PCOS can increase your risk of some long-term health conditions such as
It is important to note that you may only experience a handful of symptoms and the symptoms experienced will differ from person to person. Having PCOS can be a challenging experience. However, with an accurate diagnosis and appropriate support from your GP and other clinicians such as dietitians, psychologists, both the short- and long-term symptoms of PCOS can be managed.
The diagnosis of PCOS is quite complex
You require to meet 2 of the 3 criteria to be diagnosed with PCOS
Other conditions can cause similar symptoms to PCOS, so your doctor must exclude these before a PCOS diagnosis is made.
A Note on PCOS & Fertility
There is a common myth that PCOS makes you infertile. While PCOS can make it harder to become pregnant, a healthy lifestyle and medical support will allow most women with PCOS to have children.
For more info on PCOS and fertility, click here.
According to PCOS management guidelines, nutrition and lifestyle often play the most important role in PCOS management and should be discussed as the first line of treatment (before medications are introduced).
The healthy eating guidelines recommended to the general public also apply to the management of PCOS. Here is the Healthy Plate Model, aim for most of your meals to look like this:
For further information about portion sizes, click here
Women with PCOS should consider:
Low glycaemic (Low GI) carbohydrates
Low GI carbohydrates cause a slower increase in your blood sugar levels. This means they help balance insulin levels which has been shown by research to reduce PCOS symptoms.
Minimally processed and high fibre carbohydrates are typically the ones that have a low GI. Examples of low GI carbohydrates include:
Paying attention to the portion sizes of your carbs and pairing them with lean protein and healthy fats will help balance your blood sugar and insulin further. It is important to note that a low GI diet does not mean a low carbohydrate diet. Choosing low GI carbohydrates means that you can still enjoy carbohydrates whilst managing your PCOS symptoms.
Including sufficient protein in our meals and snacks can help us
There is also evidence suggesting that including plant-based sources of protein (e.g., chickpeas, edamame) is associated with better fertility rates (Panth et al., 2018).
Using healthy fats is important in the management of PCOS.
Examples of foods that provide healthy fats are
Spreading your meals and snacks throughout the day (that is, eating roughly every 3-4 hours) can help balance your blood sugar and insulin levels. This means eating 3 meals (breakfast, lunch, and dinner) and 2 snacks in between for most people. Here is an example of a day of eating:
Breakfast: 2 scrambled eggs with 2 slices of wholegrain bread topped with hummus
Morning Tea: 1 apple with 2 tbs peanut butter
Lunch: Slice of frittata with a side salad dressed with olive oil, lemon and salt and pepper
Afternoon Tea: Pottle of yoghurt with a handful of nuts
Dinner: Vegetable and tofu dahl with brown rice (recipe for lentil dahl here)
PCOS and weight loss
Research has found that a 5-10% weight loss (in those who were overweight) reduces the levels of male hormones being produced by the body and improves the body’s ability to use insulin. This has been shown to
If you seek weight loss, focus on having nutritionally balanced and healthy meals and take a slower sustainable approach (losing 0.5-1kg a week, or even less if you don’t have much weight to lose). Doing it this way gives you time to form some long-lasting habits and means that you are less likely to regain the weight that you have lost.
However, improving the nutrition of your diet, moving more, finding stress management strategies, and better sleep can still improve your PCOS symptoms even if you don’t lose weight. Note that weight loss in healthy weight individuals is not recommended as it does not improve PCOS symptoms. Note that yo-yo dieting (going on and off diets) is damaging to long term health. If you have a history of yo-yo dieting, it is recommended that you speak to a Registered Dietitian or Registered Nutritionist.
PCOS and eating disorders
There is a higher rate of eating disorders in PCOS. If you struggle with binge eating or heavily rely on food as a coping tool, it is recommended that you connect with a Registered Dietitian and Psychologist.
Nutrition is just one piece of the puzzle. It is also important to consider
Stress management: Having PCOS can be stressful, and unfortunately, stress has been found to worsen PCOS symptoms (Papalou & Diamanti-Kandarakis, 2016). Therefore, self-care and finding stress management strategies are absolute essentials in PCOS management.
Movement and physical activity: Amongst a range of benefits, physical activity helps improve insulin sensitivity. Find a type of activity you enjoy. This could be dancing, running, online fitness classes etc. It is recommended that adults get 30 mins/day of moderate-intensity exercise a day or 150 min/week.
Sleep: Fatigue is a common symptom in PCOS and PCOS put you at higher risk for sleep apnoea. Women with PCOS need consistent sleep to feel energized. The general recommendation is to get between 7-9 hours every night and sleep and wake up at roughly the same time each day.
There is emerging research that certain supplements in addition to a nutritious and balanced diet may help with the management of PCOS symptoms. However, more research is needed before we can make any firm recommendations.
Tips for PCOS and supplementation
Inositols are small molecules naturally found in foods like whole grains and citrus fruits. Some research has found that inositol supplementation helped with
Inositols are perhaps the most widely researched PCOS supplements. Most research has used between 2-4mg/day of inositol, with no reported side effects. Side effects such as nausea typically occurred at 12g/day. Some research suggests that taking Myo-inositol and D-chiro-inositol in a 40:1 ratio is most beneficial (Nordio et al., 2019).
Some women with PCOS may be prescribed metformin, a drug that improves insulin sensitivity. However, according to the international PCOS guidelines, long term use of metformin has been associated with low Vitamin B12 levels, and they encourage monitoring of B12 levels. In this patient group, a B12 supplement may be beneficial.
Limited evidence suggests that an omega-3 supplement helps improve insulin resistance and improved blood lipids (Yang et al., 2018).
A vitamin D deficiency is common in women with PCOS, likely because vitamin D plays a role in hormonal health and insulin sensitivity. If you have darker skin or don’t get sun exposure, you are at an even higher risk of deficiency. Speak to your doctor about vitamin D supplementation.
Magnesium deficiency is common in women with PCOS (Babapour et al., 2021). Consider getting a blood test to assess for magnesium deficiency before supplementation.
While several evidence-based websites provide helpful advice on PCOS management (listed below), many others spread nutrition misinformation. Red flags to look out for are
Look for content written by:
Working with professionals
If you are diagnosed with PCOS, it is essential to be working with a supportive GP who
If you feel that you require extra support, don’t be afraid to ask your GP for it.
Associations Between Serum Magnesium Concentrations and Polycystic Ovary Syndrome Status: a Systematic Review and Meta-analysis. Biological Trace Element Research, 199(4), 1297-1305. https://doi.org/10.1007/s12011-020-02275-9
Mavropoulos, J. C., Yancy, W. S., Hepburn, J., & Westman, E. C. (2005). The effects of a low-carbohydrate, ketogenic diet on the polycystic ovary syndrome: A pilot study. Nutrition & Metabolism, 2(1), 35. https://doi.org/10.1186/1743-7075-2-35
Nordio, M., Basciani, S., & Camajani, E. (2019). The 40:1 myo-inositol/D-chiro-inositol plasma ratio is able to restore ovulation in PCOS patients: comparison with other ratios. Eur Rev Med Pharmacol Sci, 23(12), 5512-5521. https://doi.org/10.26355/eurrev_201906_18223
Panth, N., Gavarkovs, A., Tamez, M., & Mattei, J. (2018). The Influence of Diet on Fertility and the Implications for Public Health Nutrition in the United States. Frontiers in public health, 6, 211-211. https://doi.org/10.3389/fpubh.2018.00211
Paoli, A., Mancin, L., Giacona, M. C., Bianco, A., & Caprio, M. (2020). Effects of a ketogenic diet in overweight women with polycystic ovary syndrome. Journal of translational medicine, 18(1), 104. https://doi.org/10.1186/s12967-020-02277-0
Papalou, O., & Diamanti-Kandarakis, E. (2017). The role of stress in PCOS. Expert Review of Endocrinology & Metabolism, 12(1), 87-95. https://doi.org/10.1080/17446651.2017.1266250
Yang, K., Zeng, L., Bao, T., & Ge, J. (2018). Effectiveness of Omega-3 fatty acid for polycystic ovary syndrome: a systematic review and meta-analysis. Reproductive Biology and Endocrinology, 16(1), 27. https://doi.org/10.1186/s12958-018-0346-x
Last modified: June 22, 2022