PMOS (previously called PCOS) is the most common reproductive hormone disorder in women. More than one in ten women have it.
It's diagnosed when you have at least two of these three things:
- Higher than usual levels of 'male' sex hormones, like testosterone (though it's normal for women to have some of these hormones)
- Irregular periods, or not ovulating
- A very high number of ovarian follicles, often called 'polycystic ovarian morphology'
It's a complex condition that affects your hormones, your metabolism, and your mental wellbeing.
We don't know exactly what causes PMOS. But we do know that lifestyle can make the symptoms better or worse.
The problem is that there's still a lot of confusion about what this actually means for nutrition, insulin, supplements, and fat loss. Too often, women walk away feeling more lost than when they started.
Let's clear it up.
1. Your doctor isn't fobbing you off when they say 'go on the pill and lose weight' — they're just not explaining the whole picture
PMOS can take a long time to diagnose. Because of this, many women end up feeling frustrated and unheard by their doctors.
That feeling can get worse when the advice they finally receive is to 'go on the pill and lose some weight'.
A lot of women think that the pill is just to hide the symptoms, and being told to lose weight can feel stigmatising.
What a lot of doctors don't do is explain why these treatments can actually work. They don't always make it clear that this is more than a quick fix.
Here's why: most cases of PMOS involve hormonal disruption, including too much of the 'male' hormones, and insulin resistance.
That disruption is what drives uncomfortable symptoms like coarse hair growth, acne, and hair loss.
Weight loss and the pill both directly act on hormonal balance.
2. Your weight strongly affects your insulin, not the other way around
A lot of women with PMOS also have insulin resistance.
Unfortunately, sometimes well-meaning misinformation on the internet often leads them to believe that insulin resistance means they can't lose weight - the very thing their doctor is telling them will improve their PMOS.
Plenty of things influence how your body handles insulin, including your genetics and whether you have PMOS. But the single biggest factor is how much body fat you have.
Think of insulin as a messenger. Its job is to move energy out of your blood and into your cells — and not just energy from carbs, but from fats too.
The trouble starts as your fat cells fill up. Once they're full, they resist storing any more energy because there simply isn't room.
So your body has to produce more and more insulin just to do the same job it used to do easily.
Here's some good news. Even though women with PMOS symptoms are more likely to be overweight, the research does not suggest that the PMOS is what's MAKING them overweight due to insulin resistance.
In fact, scientific research does not show convincing evidence that women with PMOS are physically more prone to gaining weight, or that their hunger hormones work differently from anyone else's.
While women with PMOS are more likely to be overweight, women at a healthy weight can get PMOS too. For them, eating a balanced, nutritious diet is especially important for avoiding weight gain, since gaining weight is so often tied to symptoms getting worse.
3. Insulin resistance is a problem partly because the ovaries DON'T become insulin resistant
Insulin does many jobs in the body, not just moving energy around. One of its many other roles is helping to trigger a chain of hormonal reactions that tell the ovaries to make sex hormones.
The ovaries have nothing to do with storing excess energy, so they never become insulin resistant.
This means that when there's more insulin around telling the ovaries to make more sex hormones, that's exactly what they do.
This is one of the main ways that insulin resistance and excess weight team up to drive PMOS symptoms and make them worse.
On the flip side, staying at a healthy weight lowers the amount of insulin your ovaries are exposed to. Less insulin means fewer 'male' sex hormones, which often means milder symptoms.
This matters even more because the ovaries are not only more sensitive to insulin than the rest of the body, but in women with PMOS they are genetically predisposed to producing more male sex hormones at baseline too.
4. There's no 'best' diet for PMOS — and yes, you can still eat carbs!
Just as there's no one perfect diet for weight loss, there's no one perfect diet for PMOS.
In fact, research has shown that many different types of diets can improve PMOS — including some that are high in carbs, such as the 'DASH' diet.
Because most insulin resistance is made worse by excess body fat, if you're eating a balanced diet most of the benefit from changing your diet comes down to losing any excess fat, not from cutting out a particular food group.
And despite the claims you'll see online, current research does not suggest that women with PMOS need to avoid carbs to manage the condition.
Women with PMOS are at higher risk of their insulin resistance eventually progressing to pre-diabetes or type 2 diabetes.
But even when that does happen, an 'intolerance' to carbs is a SYMPTOM of the diabetes and prediabetes. Carbs are not the CAUSE.
- Your overall eating pattern and lifestyle matters a lot in PMOS, even for women at a healthy weight
You shouldn't follow any specific strict, restrictive diet like paleo, keto, or carnivore. But that doesn't mean the kind of food you eat doesn’t matter.
The quality of the diet matters. Diets high in fruits, vegetables, wholegrains, legumes and a moderate amount of protein help to ensure that macro-nutrient, micro-nutrient, and fibre needs are met.
This supports overall wellbeing, as well as blood sugar management, heart health, and psychological wellbeing - areas where women with PMOS are at greater risk.
Even women without PMOS can run into cycle problems if they're not getting enough nutrients. That can show up as irregular periods, unwanted hair growth, or low mood and other psychological symptoms.
We also know that women who meet the exercise guidelines — 150 to 300 minutes of moderate exercise per week, plus two resistance training sessions — are likely to see their symptoms improve.
6. It's normal to feel overwhelmed when you realise all the changes you could be making, that's why there's help beyond your GP
If your doctor's told you that you need to switch up your lifestyle as a woman with PMOS, it can be hard to know where to start.
Eat better, move more, lose weight, lift weights, manage your stress, sleep well - it's a lot, and "just do everything better" is not a sustainable strategy.
The real challenge isn't finding the perfect plan, it's building habits you can actually do in real life with a job, a family, and bad days.
Your GP is a great source of medical information, but a ten-minute appointment isn't designed to teach you how to change the way you shop, cook, train, and think about food week after week.
What works is structure, accountability, and someone in your corner adjusting the plan as your life and your symptoms change.
That's what behaviour-based nutrition and exercise coaching is built for. Instead of handing you another rulebook, a good coach helps you:
- Start with small, sustainable changes
- Figure out go-to meals you actually like
- Train in a way that doesn't involve going to the gym every day
- Stay accountable when motivation dips, and problem-solve the setbacks instead of giving up
You don't have to figure all of this out alone, and you don't have to get it perfect. You just need a starting point and someone to help you keep going.
If you're ready to turn "I know I should" into changes that actually stick, book your free consultation below today.