7 Food Myths About PCOS (PMOS) and Endometriosis

_{This blog post also uses PMOS terminology, which stands for polyendocrine metabolic ovarian syndrome (formerly known as polycystic ovary syndrome – PCOS).}

This post covers 7 food myths about PCOS (now called PMOS) and endometriosis you can finally stop believing, according to science, and what to do instead.

There was a time when grocery shopping was… well, grocery shopping. Nothing fancy. I’d grab a loaf of bread, maybe some yoghurt, pasta for an easy weeknight dinner, and maybe a chocolate bar that somehow made its way into my basket without my permission.

Then the PCOS/PMOS diagnosis came (and later endometriosis), and I started reading all about nutrition and what to eat with these two conditions. Suddenly, gluten was public enemy number one. Dairy was apparently plotting against my hormones. Sugar had become the villain in every wellness story, and carbs? They were practically cancelled. So, over the years, I discovered that many of the food myths about PCOS and endometriosis simply aren’t supported by research.

The truth is that both PCOS/PMOS and endometriosis are complex medical conditions. Nutrition can absolutely support your overall health and symptom management, but there isn’t one magical diet that works for everyone. Let’s bust some of the biggest food myths about PCOS and endometriosis I’ve heard through the years of battling these two conditions.

Food myths about PCOS/PMOS and endometriosis

1. You have to go gluten-free is the one the strongest food myths about PCOS/PMOS and endometriosis

Somewhere along the way, gluten became the nutritional equivalent of a movie villain. Even my doctor suggested that I cut it from my diet for managing my pain (spoiler alert: it didn’t help).

If you have PCOS/PMOS or endometriosis, you’ve probably heard that cutting out gluten will reduce inflammation, balance your hormones and transform your symptoms. It sounds really convincing. The science? Not quite as dramatic.

Current research doesn’t support recommending a gluten-free diet for everyone with PCOS/PMOS or endometriosis. If you have coeliac disease or medically diagnosed gluten sensitivity, avoiding gluten is essential. But for everyone else, there isn’t enough high-quality evidence to say that gluten is the problem.

Some people genuinely feel better after removing gluten. That’s completely valid. But it’s also worth remembering that eliminating gluten often changes many other parts of the diet too. People may eat fewer ultra-processed foods, cook more meals at home, or increase their intake of naturally gluten-free foods like vegetables, beans, and quinoa. Those changes (not gluten itself) may partly explain why some people notice improvements.

Instead of asking, “Should I avoid gluten?” a better question might be, “Does gluten actually cause symptoms for me?” Those are two very different conversations.

2. Sugar causes PCOS/PMOS and endometriosis

If I had a nickel for every time someone blamed hormones on sugar, I’d probably be writing this from a beach somewhere (which I’m not, I swear). Let’s clear something up.

Sugar does not cause PCOS/PMOS. PCOS/PMOS develops because of a combination of genetics, hormone regulation, and environmental factors. While many people with PCOS also have insulin resistance, that’s very different from saying sugar caused the condition.

Does that mean sugar doesn’t matter at all? Not exactly. For people with insulin resistance, eating patterns that include plenty of fibre, protein and healthy fats may help support blood sugar control. But that’s about improving overall dietary quality, not banning birthday cake forever.

The story is similar with endometriosis. There is currently no evidence that eating sugar causes endometriosis. Some studies suggest diets high in added sugars may be associated with increased inflammation, but these findings don’t prove that sugar directly worsens the disease. One slice of cake isn’t creating endometriosis. And one green smoothie isn’t curing it either.

That being said, many studies suggest that cutting refined sugar and ultra-processed sugary foods (as part of a healthy lifestyle) may help with insulin resistance associated with PCOS/PMOS or reduce inflammation caused by endometriosis.

3. Is dairy really inflammatory?

Poor dairy. Depending on which social media account you follow, milk is either a nutritional superhero or a hormone disaster waiting to happen. Research tells a more balanced story.

For most people, dairy products are not inherently inflammatory. In fact, several observational studies have even found that higher dairy intake is associated with a lower risk of developing endometriosis. While these studies can’t prove cause and effect, they certainly don’t support the idea that everyone with endometriosis should avoid dairy. A similar story goes for PCOS/PMOS. Also, full-fat dairy doesn’t spike insulin as much and may even improve insulin sensitivity.

Dairy foods also provide important nutrients that deserve a little more attention, including calcium, iodine, and protein.

Of course, if dairy causes digestive symptoms or you have a diagnosed intolerance, that’s different. Nutrition should always be individual. But eliminating an entire food group simply because it’s trending isn’t evidence-based nutrition. Your morning yoghurt doesn’t need a defence lawyer.

4. Do you really need to avoid carbs with PCOS/PMOS and endometriosis?

As a dietitian, I sometimes think carbohydrates have the worst public relations team in history. Bread gets blamed. Rice gets blamed. Potatoes get blamed. Meanwhile, nobody stops to ask whether we’re talking about whole grains, beans, fruit, or doughnuts.

Because they’re not the same thing. Research on evidence-based nutrition for PCOS/PMOS consistently suggests that the quality of carbohydrates matters far more than eliminating them. Whole grains, legumes, vegetables, and fruit provide fibre, vitamins, and minerals that support overall health. Higher-fibre carbohydrates may also help improve blood sugar management in people with insulin resistance.

For endometriosis, there is no convincing evidence that cutting carbohydrates improves symptoms. And here’s something social media doesn’t always mention: carbohydrates are your body’s preferred source of energy. They also keep our muscle mass (alongside protein and a lot of movement).

Your hormones don’t panic every time you eat a baked potato. They probably panic more when you’re constantly stressed about eating one.

5. You need expensive supplements to »balance your hormones« even though food myths about PCOS/PMOS and endometriosis

The supplement aisle is starting to look like a luxury boutique. Hormone gummies. Hormone powders. Hormone teas. Hormone capsules. If they came with a loyalty card, many of us would already qualify for free shipping.

The reality is much less glamorous. Some supplements show promise in research. For example, inositol has been studied in people with PCOS and may help improve insulin sensitivity and support ovulation in some individuals. Vitamin D supplementation may be appropriate if a deficiency is identified, and omega-3 fatty acids continue to be investigated for their potential role in inflammation and metabolic health.

Notice the wording? May. Not will. To this day, no supplement has been proven to cure PCOS/PMOS or endometriosis. Sure, supplements can help fill nutritional gaps or support specific health needs, but they work best as part of a broader treatment plan, not as a replacement for balanced meals, medical care, or prescribed treatment. If someone promises to “heal your hormones” with one powder, it’s probably time to keep scrolling.

6. Is there a best diet for PCOS/PMOS and endometriosis?

Wouldn’t life be easier if there were one perfect meal plan? Breakfast at eight. Salad at noon. Salmon at six. Hormones fixed by last Friday. Unfortunately, our biology isn’t that cooperative.

Researchers have studied Mediterranean-style eating patterns, low-glycaemic index diets, DASH, vegetarian diets, ketogenic diets, and various “anti-inflammatory” approaches. So far, no single diet has emerged as the clear winner for everyone (on that note, Mediterranean-style eating patterns showed the most promise). Instead, the strongest evidence points toward overall dietary patterns rather than strict food rules. That generally means eating more:

Vegetables.
Fruit.
Legumes.
Whole grains.
Nuts and seeds.
Olive oil.
Fish, where appropriate.
Minimally processed foods.

Notice what’s missing? Food guilt. Because the healthiest diet isn’t the one that’s the most restrictive. It’s the one you can actually enjoy and maintain over time.

7. Food alone can cure PCOS/PMOS and endometriosis

This might be the most damaging myth of all. And honestly, my favorite one. I cannot tell you how many times I talked about this topic for hours and hours to anybody who wanted to listen.

It usually starts with a sentence like: “I healed my hormones naturally.” And while I’m genuinely happy when someone feels better, personal stories aren’t the same as scientific evidence.

Nutrition plays an important role in managing both PCOS and endometriosis. A balanced eating pattern can support metabolic health, cardiovascular health, blood sugar regulation, and overall well-being. Some people also notice improvements in energy levels or symptom severity when they make sustainable dietary changes.

But neither PCOS/PMOS nor endometriosis currently has a cure through diet (or medicine for that matter). As I said earlier, these conditions involve genetics, hormones, immune function, and many other biological processes that no single food can switch on or off. Suggesting that people could “eat their way out” of a chronic condition creates unnecessary guilt. It implies that if symptoms continue, they just haven’t tried hard enough.

That’s not only inaccurate—it’s unfair. Food can support treatment. It shouldn’t carry the entire responsibility for it.

What do to instead of listening food myths about PCOS/PMOS and endometriosis?

After reading seven myths, you might be thinking, “Okay… if I don’t have to cut out gluten, dairy, sugar and every carb known to humanity, what should I actually do?” Honestly? The answer is much less glamorous than social media would have you believe, and that’s a good thing. Instead of chasing the “perfect” diet, focus on building eating habits you can maintain for years, not weeks.

Eat more fiber

Fibre is one of the most underrated nutrients when it comes to hormone and metabolic health. Aim to include: vegetables, fruit, beans and lentils, oats, whole grains, nuts and seeds. For people with PCOS/PMOS, higher-fibre meals may help support blood sugar regulation and insulin sensitivity. Fibre also supports gut health and helps keep you feeling satisfied after meals.

Include protein with most meals

Protein isn’t just for people who spend their weekends lifting weights. Including a source of protein at meals may help support satiety and keep energy levels more stable throughout the day. Good options include: eggs, Greek yogurt, fish, chicken, tofu, beans, lentils, cottage cheese.

Don’t fear healthy fat

Healthy fats are important for overall health. Think: olive oil, avocado, walnuts, almonds, chia seeds, flaxseeds, oily fish like salmon or sardines. These foods provide nutrients that support heart health and may contribute to an overall anti-inflammatory eating pattern.

Focus on adding foods

not just removing them. Instead of worrying about cutting things out, try adding another vegetable, a handful of beans, some berries, extra fibre, or a source of protein. Small additions often make a bigger difference than dramatic restrictions.

Lifestyle matters too

Be consistent. Your hormones don’t care what you ate at one birthday party. They respond to your overall eating pattern over weeks and months. That means one takeaway meal won’t ruin your progress, just like one salad won’t magically fix everything. Consistency beats perfection every single time.

Work with your healthcare team. This one is really important. Nutrition is just one part of managing PCOS or endometriosis. Depending on your symptoms, treatment may also include: medication, hormonal therapy, surgery (for some people with endometriosis), physical activity, sleep, stress management. Food and lifestyle should support your treatment, not replace it.

FAQ: Food myths about PCOS/PMOS and endometriosis

Does losing weight cure PCOS/PMOS? No. Weight loss does not cure PCOS/PMOS. For people living with overweight or obesity, modest weight loss may improve insulin resistance, menstrual regularity and fertility outcomes. However, many people with PCOS/PMOS are not overweight, and they still deserve appropriate treatment and support.

Is there an anti-inflammatory diet for endometriosis? There isn’t one officially recognised “endometriosis diet.” However, research suggests that eating patterns rich in vegetables, fruit, legumes, whole grains, olive oil, and fish may support overall health and could help manage inflammation. More high-quality studies are still needed.

Should everyone with PCOS avoid carbohydrates? No. Carbohydrates are an important source of energy. Rather than avoiding carbs altogether, focus on choosing higher-fibre options like oats, whole grains, beans and fruit, and pair them with protein and healthy fats.

Can diet cure endometriosis? No. At the moment, there is no evidence that diet (or anything for that matter) can cure endometriosis. A balanced eating pattern may help support overall health and improve quality of life for some people, but it is not a replacement for medical treatment.

Is dairy bad for PCOS? Current evidence doesn’t show that everyone with PCOS should avoid dairy. If you tolerate dairy well (meaning that you’re not lactose intolerant), it can be a valuable source of protein, calcium, and other nutrients. Unless you have an allergy or intolerance, there’s no evidence-based reason to eliminate it routinely.

What is the best diet for PCOS? There isn’t one “best” diet. Research generally supports eating patterns that include: plenty of vegetables, fruit, whole grains, legumes, healthy fats, quality protein, and minimally processed foods. The best diet is one that supports your health while fitting your lifestyle, culture, and food preferences.

Final thought before you go

Over the years, I came across a lot of different content about women and hormonal health. I found a lot of different nutrition and lifestyle tips, and while a lot of them helped me manage my conditions, a lot of them weren’t really helpful (and sometimes even damaging).

So, if there’s one thing I’d love you to take away from this post, it’s this: Your hormones are complicated. Social media likes simple answers because they fit neatly into a 30-second Reel. Science, unfortunately (or fortunately, depending on how you look at it), is much messier than that. There isn’t one food that’s secretly ruining your hormones, just like there isn’t one magical ingredient waiting to heal them. It’s the small things you need to do over and over again to create a lifestyle you’re comfortable with and that supports your health.