PCOS has a new name

If you've heard of PCOS, through your own diagnosis or someone close to you, you may have noticed it has a new name: PMOS, or polyendocrine metabolic ovarian syndrome. The change follows a global consensus published in The Lancet in May 2026, and it reflects what experts have long understood: this is a whole-body condition, not just an ovarian one.

The new name should bring earlier diagnosis, greater awareness and more complete care. It doesn't change the condition itself, how it's diagnosed or the treatments available.

This article explains:

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Why the old name had to go

“Polycystic ovary syndrome” put the spotlight on the ovaries and on cysts. Many people with the condition have normal-looking ovaries on a scan, and some women were told they couldn't have PCOS for exactly that reason. Others struggled to connect the name to what they actually lived with: skin and hair changes, anxiety and low mood, irregular cycles, fatigue and difficulty regulating weight.

The new name describes each part of the condition:

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What PMOS can look like

PMOS is one of the most common hormonal conditions in women of reproductive age. It usually involves a mix of three features, and each one feeds into the others.

Insulin resistance

With insulin resistance, your cells respond less well to insulin, so your body makes more of it to keep blood sugar steady. It can happen at any body size. You may notice energy crashes after meals or in the afternoon, along with strong cravings for sugar and refined carbohydrates.

High insulin also tells your body to store energy and hold on to fat, so many women find weight gain easier and weight loss harder, especially around the middle. Fat stored around the abdomen is largely visceral fat, which is metabolically active and can worsen insulin resistance and inflammation, keeping the cycle going.

Raised androgens

Everyone makes androgens, but high insulin signals the ovaries to produce more of them. Insulin also lowers sex hormone-binding globulin (SHBG), a blood protein that binds testosterone, leaving more testosterone active in the body. Raised androgens can cause acne, extra hair growth on the face or body, and thinning hair on the scalp.

Irregular ovulation

Irregular ovulation often shows up as infrequent, irregular or missed periods. When a period does arrive, it can be heavier or longer than expected, and heavy bleeding can drain your iron stores and add to tiredness.

Many women with PMOS also live with low mood, anxiety and fatigue. Insulin resistance, hormonal shifts, poor sleep, low iron and the stress of managing symptoms can all contribute, so these symptoms deserve attention as part of the whole picture. Speak to your GP if any of these apply to you:

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Where nutrition fits in

There's no single PMOS diet, but the habits that help most overlap with a Mediterranean-style, anti-inflammatory way of eating. That pattern supports several features at once, from insulin resistance to energy and cycle health. The focus is on balanced meals, regular movement and good sleep, not on cutting out whole food groups.

Choose slow-release carbs

Your body, brain and hormones all need carbohydrates. What matters is the type, the amount and what you eat them with.

• Pick slow-release options such as oats, legumes, quinoa, brown rice, sweet potato and whole fruit. Their fibre slows digestion, so glucose enters the blood gradually.

• Spread carbs across the day. Steady portions at each meal work better than one large carb-heavy meal, or skipping meals and overeating later.

• Use the plate method. Fill half your plate with non-starchy vegetables, a quarter with protein and a quarter with slow-release carbs, plus a little healthy fat.

• Try resistant starch. Legumes, oats, and potatoes, rice or pasta that have been cooked and cooled contain a starch that behaves a little like fibre, even after reheating.

If you have a history of disordered eating, work with a professional so that portion awareness doesn't turn into rigid rules.

Soften the glucose rise

Carbs are only part of the story. These four habits all slow the rise in blood sugar after eating:

Meal order may help too. A few small studies, mostly in type 2 diabetes, suggest that eating vegetables and protein before carbohydrates reduces the post-meal spike, so it's worth trying at your biggest meal.

Pair your snacks

Carb-only snacks such as rice cakes, a muesli bar, dried fruit or juice cause a fast rise and then a dip, leaving you tired and craving more. Pairing them with protein or healthy fat steadies the response.

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Movement, sleep and stress

Walking and other cardio both help, and strength training adds extra benefit because muscle is a major site of glucose uptake. UK guidelines suggest around 150 minutes of moderate activity a week plus muscle-strengthening work on at least two days, but the best plan is the one you'll keep doing.

Poor sleep can worsen insulin resistance and increase hunger and cravings, and ongoing stress does much the same. Consistent sleep routines, outdoor daylight and stress relief you enjoy all belong in your plan.

Weight is a personal question

For some women, losing around 5–10% of body weight improves cycles and insulin sensitivity. It isn't the goal for everyone, and healthy habits help whatever the scale says.

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Supplements: test first, then personalise

Supplements work best when evidence about you guides them. Blood testing for common gaps is a good starting point:

• Iron and ferritin: especially important if your periods are heavy or you feel tired.

• Vitamin D: low levels are common in the UK, and the right supplement dose depends on your result.

• Vitamin B12 and folate: check B12 if you take metformin or eat little animal food.

• Magnesium and omega-3: review your intake against your diet, as both often run low.

Where DNA testing fits

Genetic variants linked to how you process vitamin D, B12, folate and omega-3 can help you decide which nutrients to prioritise or monitor. Each variant has a small effect on its own, so use your results to refine your plan alongside blood results and symptoms, not instead of them.

What about inositol?

Inositol is the supplement women with PMOS hear about most. Some studies suggest it may support insulin sensitivity and ovulation, with myo-inositol commonly studied at 2–4 g a day, but results are mixed and the evidence is still developing. It can cause stomach upset, so check with your doctor or a dietitian first, especially if you're trying to conceive or take other medication.

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What to do next

• Expect both names. Seeing PCOS and PMOS on your paperwork is normal during the transition.

• Ask about screening. Ask your GP about blood sugar, cholesterol, blood pressure and liver health, not just your cycle. Raise long gaps between periods too, as these matter for the health of the womb lining.

• Bring your whole story. Mention skin, hair, mood, sleep and energy at appointments, as well as periods.

• Build a personal plan. Shape it around your own symptoms and goals, whether that's steadier energy, fewer cravings, more regular cycles or fertility support.

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FAQs

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The bottom line