PMOS (PCOS) Diet: Best Foods & Diet for PMOS

Polyendocrine metabolic ovarian syndrome (PMOS), previously called polycystic ovary syndrome (PCOS), affects your hormones, metabolism and ovarian function. Because 65 to 80% of people with PMOS also have insulin resistance,* diet can play an important role in managing symptoms like weight gain, irregular menstrual cycles and potentially even acne.

If you have been told to cut out carbs, give up dairy and lose weight to manage PMOS, eating can start to feel like another problem you must solve. However, the evidence supports a more flexible approach rather than adopting restrictive eating practices, and cutting out entire food groups from your diet. So, choosing meals that nourish you and support your metabolic health is key. 

Is There a Specific Diet for PMOS (PCOS)? 

There is no specific or magic diet for PMOS, but following a balanced diet that incorporates anti-inflammatory and low-glycemic foods is widely recommended for managing your symptoms and improving insulin resistance.* The key is to be flexible, not rigid, with your dietary patterns. Researchers have studied low-carbohydrate, low-glycaemic-index (GI), Mediterranean-style, and Dietary Approaches to Stop Hypertension (DASH) diets, but none have been shown to be universally superior to another for managing PMOS symptoms.

Some studies favour specific dietary approaches for particular outcomes. For example, one study involving 96 obese and overweight women with PMOS found that following a low-GI diet resulted in greater improvements in insulin sensitivity and menstrual regularity compared to a conventional healthy diet.⁺

This makes low-GI eating a reasonable option, and the Association of UK Dietitians (BDA) also advocates it for PMOS.** However, the right eating pattern should fit your budget, culture, food preferences, and appetite, while staying healthy and balanced and leaving room for meals out and foods you enjoy.

Why Does Diet Matter for PMOS (PCOS)?

PMOS isn’t just a condition that affects your ovaries, it’s driven by hormonal and metabolic changes, so nutrition can impact how you feel. For many people, insulin resistance and PMOS are closely associated, although it does not affect everyone, and low-grade inflammation is a systemic feature of the condition. Your diet and food choices can directly affect both factors. 

Insulin helps glucose move from your blood into your cells where it can be used for energy. With insulin resistance, cells respond less effectively, so your pancreas will produce more insulin to compensate. High insulin levels stimulate your ovaries to overproduce androgens, male hormones, like testosterone, which can cause symptoms such as irregular periods, acne and excess hair growth known as hirsutism. Insulin resistance can also make weight loss more difficult.

Because diet directly impacts insulin and blood sugar levels, food can be a useful tool for managing PMOS symptoms regardless of your weight because insulin resistance can occur even in lean women with PMOS.* 

Because low-grade inflammation is another common feature of PMOS, adjusting what you eat can also help lower inflammatory markers and improve metabolic responses; one case-control study found that people who follow a pro-inflammatory diet have a higher chance of PMOS.** This shows that there is a link between the two, but not that diet causes PMOS.

What to Include in a PMOS (PCOS) Diet?

Adopting a PMOS-friendly diet is less about what you should avoid and more about what you can add or prioritise. Start with protein, fibre-rich wholegrain carbohydrates, unsaturated fats, and a variety of plant foods, aiming to “eat the rainbow” in colour and variety. Focus less on making every meal perfectly balanced and more on your overall dietary pattern across days and weeks. 

Lean and plant-based proteins

Protein helps to maintain muscle mass and can make meals more satisfying, so you have fewer cravings and snack less between meals. Protein can help keep your blood sugar levels stable, especially when paired with slow-release carbohydrates. When most people think of protein, they think of meat, but plenty of plant-based alternatives and leaner options are available. 

Choose foods like:

• Lean chicken and turkey breast

• Fish including cod, haddock, salmon, trout, mackerel and sardines

• Eggs

• Greek yoghurt

• Tofu and tempeh

• Beans, lentils and chickpeas

Plant proteins also have the added advantage of being high in fibre. They can also provide added texture to pasta sauces and curries. Although protein powder can be useful to supplement your diet, everyday foods can help you enjoy your food while providing a nutritious boost and are often more affordable.

High fibre, slow-release carbohydrates

Carbohydrates are your body’s main energy source, but different types can affect your blood sugar differently. For example, some cause rapid blood sugar spikes, such as white bread, white rice and pasta, and fizzy drinks like cola, while others release energy more slowly over long periods of time, like wholemeal pasta, wholegrains like brown rice and quinoa, and pulses like chickpeas and lentils. When it comes to carbohydrates for PMOS, choosing the right types is key. 

Useful choices include:

• Oats

• Quinoa

• Wholegrain or seeded bread (sourdough, if you can get it)

• Wholewheat pasta

• Brown rice

• Pulses

• Potatoes with their skins on or cooked and cooled potatoes

The glycaemic index, or GI, describes how quickly a carbohydrate-containing food raises blood glucose. Here are some examples*:

These are just guides, and the type of food, processing and cooking styles can change a food’s GI. Start with healthier swaps, such as choosing wholemeal bread or lentil pasta instead of white varieties, or swapping a cake for a piece of fruit, like an apple, as a snack. Adding a handful of nuts with your fruit will reduce the blood sugar spike you can get.

Fibre is also important in a PMOS diet because it can help regulate blood sugar and insulin levels, keep you feeling fuller for longer, and lower inflammation through its effects on gut health. UK guidelines recommend that adults should aim to eat 30g of fibre per day as part of a healthy diet.** However, if fibre is new to you, start gradually and build up slowly to avoid feeling bloated, gassy, or uncomfortable.

Healthy unsaturated fats

Despite its bad press, fat belongs in a balanced diet. You just need to choose the right kind. Olive oil, rapeseed oil, avocado, oily fish, nuts, and seeds provide healthy unsaturated fats, which your body needs to make hormones, manage cholesterol levels, and support heart and brain health. 

When adding healthy fats to your diet, focus on swaps rather than adding more. For example, use extra virgin olive oil or cold-pressed rapeseed oil instead of butter, have sardines on wholegrain toast for lunch, or replace some of the meat in a casserole with beans or lentils.

Oily fish like salmon, sardines, trout, and mackerel, plus nuts like walnuts and seeds such as chia seeds and flaxseeds, are also great sources of omega-3. Omega-3 may help with managing PMOS symptoms because it can target several core drivers of the condition, including:

• Chronic inflammation

• Insulin resistance

• Hormone imbalance*

Aim to eat at least 2 portions of fish per week, including 1 oily type. If you don't eat fish, choose omega-3-rich nuts and seeds, or consider supplements.

Fruits and vegetables

You may have been told to avoid whole fruits because of their sugar content, but that’s not the case. Fruit also provides broader nutritional support through fibre, water, and other nutrients. Aim to include a varied mix of fruit and vegetables in your diet, working towards at least 5 portions each day. Fresh, frozen and tinned options all count, but try to limit fruit juice and smoothies to a total daily intake of 150ml as their sugars count as free sugars.*

Simple ways you can increase your fruit and vegetable intake include:

• Adding berries to Greek yoghurt for a nutritious breakfast idea

• Adding frozen peas to rice

• Adding a portion of vegetables to every evening meal

• Using tinned tomatoes in pasta or curry sauces

• Swapping a bag of crisps for an apple or banana

Example balanced meals

Choosing the right foods to manage PMOS is one thing, but combining them into balanced, nutritious, and exciting meals is another. So, if you’re stuck for ideas or inspiration, here are some of ours that you can try:

You can adjust these meal ideas to your likes and dislikes, as well as your portion sizes. If time is a factor when it comes to preparing fresh, healthy meals, consider convenient options like frozen fruit and vegetables, microwave rice and tinned pulses for ease

What Foods to Limit or Avoid in a PMOS Diet?

Much of the online literature surrounding a PMOS diet encourages you to cut out entire food groups, but for most people this isn’t necessary. You don’t need to avoid specific foods completely, but it can help to cut back on less healthy options, including sugary drinks, fried meals, and foods high in saturated fat and low in fibre. However, you don't need to eliminate gluten, dairy, carbohydrates, or sugar unless a clinician has advised you to.

Some of the manageable changes or swaps you can make for a more PMOS-favourable diet are:

• Sugary drinks ⇨ water, herbal tea or a low-sugar, low-calorie alternative

• White bread and pasta ⇨ brown or wholegrain varieties

• Fried foods like burgers and chips ⇨ grilled chicken breast in a wholemeal bun and sweet potato fries cooked in an air fryer

• Processed meats like burgers, bacon, sausages and ham ⇨ oily fish, eggs, pulses or plant-based alternatives

That doesn’t mean you need to eradicate occasional treats, such as takeaway, chocolate, or cakes, from your diet altogether. Instead, enjoying them as occasional treats and focussing on your overall eating pattern across weeks and months is more important than getting hung up on a single meal or snack

Can Diet Help You Lose Weight With PMOS (PCOS)?

Changing your diet by choosing healthier, lower-fat, low-glycaemic carbohydrates can support weight loss in PMOS, if that is one of your goals. PMOS can make weight loss more challenging, and cravings or difficulties with eating can enhance that challenge further. You can learn more about why PMOS makes weight loss harder in our ‘How to lose weight with PMOS’ guide.

Meals, like those discussed earlier, can support weight management. Protein and fibre can make eating more satisfying, while eating regular meals can help you avoid becoming uncomfortably hungry.

Weight loss generally requires an average energy intake that is below what your body uses, also known as a calorie deficit. Personalise how you achieve that, ensuring you get enough food and nutrients to support your overall health. Some studies show that very low energy diets can result in weight reductions of more than 15% after 12 weeks in women with PMOS.* However, these types of diets should only be conducted under the supervision of a clinician.

Important : If you are at a healthy or lower weight, losing weight isn’t advised, and may be harmful. Instead, you should focus on eating adequately and healthily and supporting your metabolic health. Small lifestyle changes, including diet, exercise, sleep and stress management, offer benefits beyond weight loss.

PMOS (PCOS) Diet: The Bottom Line

There is no single best diet for PMOS. The most useful approach includes foods that nourish you and are flexible enough to maintain. Diet can help you manage your symptoms and will support insulin sensitivity, but it is unlikely to cure PMOS. Start with small dietary adjustments, like adding beans to a meal, choosing a higher-fibre breakfast, or swapping unhealthy snacks for a piece of fruit or a handful of nuts. You don't need to eliminate entire food groups from your daily meals; sustainable changes matter more than rigid rules.  

Speak to your GP, a clinician or a dietician if you take medication, are pregnant or trying to conceive. Importantly, if you have ever had an eating disorder, talk to your GP before changing your diet.

FAQs

Is there a specific PMOS diet?

No. Despite some of the information available online, there is no specific diet that has been shown to be best for everyone with PMOS. Low-GI, Mediterranean, DASH-style, and lower-carbohydrate approaches have been studied and offer different ways to organise and plan meals. Incorporating elements of each pattern can help, but prioritise balance to meet your nutritional needs, suit your preferences, and support sustainability.

Is a low-carb diet recommended for PMOS?

No. Low carbohydrate diets are not universally supported for PMOS. Although they may suit some people, they will not suit everyone and aren't essential to PMOS management. What matters most is the quality of the carbohydrates you eat. Choose high-fibre options such as whole grains, lentils, and oats rather than foods that can cause a rapid spike in blood sugar, such as white bread and pasta.  

Do I need to cut out carbs or dairy with PMOS?

No. Both can fit into balanced eating. Carbohydrates provide energy and, in many foods, fibre, while dairy provides protein and calcium. Avoidance may be appropriate for a separate allergy, intolerance or medical condition, if a clinician has advised it. 

What vitamins help with PMOS?

No vitamin is a proven treatment for PMOS. Correcting a deficiency may be helpful. UK advice recommends considering 10 micrograms of vitamin D daily during autumn and winter. If you are trying for a baby, take 400 micrograms of folic acid daily before conception and until 12 weeks of pregnancy, unless your clinician prescribes a higher dose. This supports early fetal development and is not a fertility treatment. There is no proven “PMOS fertility diet” that replaces assessment or treatment for ovulation problems.*