Endometriosis and Nutrition: An Evidence-Based Approach

Endometriosis occurs when tissue similar to the uterine lining grows outside the uterus, usually in the pelvis. It's chronically inflamed. It causes pain, often severe, typically worsening with your period. It can affect fertility. It can make daily life difficult.

There is no dietary cure. But there is ample evidence that an anti-inflammatory diet reduces pain, improves quality of life, and may slow progression. This is not replacing medical treatment. This is complementary to it. Work with your GP and specialist first. Then use food as the supporting strategy.

What endometriosis is and why it matters nutritionally

In endometriosis, misplaced endometrial tissue bleeds during your cycle just like the tissue in your uterus. But it has nowhere to go. This triggers inflammation, scarring, and adhesions. Over time, these lesions can grow, spreading to new sites.

The inflammatory cascade in endometriosis is profound. Your immune system is activated. Inflammatory markers like TNF-alpha and IL-6 are chronically elevated.¹ Prostaglandins (hormone-like compounds that increase during menstruation) are produced in excess, amplifying pain.

Additionally, the ectopic endometrial tissue produces excess oestrogen locally. This is important: endometriosis is not just a problem of systemic oestrogen, but of local, tissue-level oestrogen production. Nutrition cannot regulate this as precisely as hormonal medication can, but certain foods reduce the inflammatory environment that sustains the disease.

Nutrition is not a replacement for medical care. It is a complementary strategy to reduce inflammation and support your body's resilience while you're managing endometriosis with your healthcare team.

The inflammatory pathway and omega-3 fats

Inflammation is driven by a balance between pro-inflammatory omega-6 polyunsaturated fats and anti-inflammatory omega-3 polyunsaturated fats. Most modern diets are heavily skewed toward omega-6 because seed oils (soya, corn, sunflower, safflower) dominate.

Omega-6 fats are metabolised into arachidonic acid, which then converts into inflammatory prostaglandins. Higher arachidonic acid levels correlate with worsened endometriosis symptoms. Conversely, omega-3 fats (EPA and DHA) compete with arachidonic acid and are metabolised into anti-inflammatory compounds.

Research shows that women with endometriosis who increase omega-3 intake (through fish, particularly fatty fish, or supplementation) experience reduced pain and improved quality of life.² A study in Human Reproduction found that women consuming omega-3 rich foods 2-3 times weekly had significantly lower dysmenorrhea (period pain) than those eating them rarely.³

The richest sources of EPA and DHA are fatty fish: wild salmon, mackerel, sardines, anchovies, herring. If you don't eat fish, algae supplements can provide algae-derived EPA and DHA. Flax and chia seeds contain ALA (alpha-linolenic acid), which converts to EPA and DHA but inefficiently (only 5-10% conversion), so they're useful supporting sources but not primary.

The practical protocol: eat fatty fish 2-3 times weekly. If that's not possible, consider a fish oil or algae supplement of 1000-2000 mg EPA+DHA daily.

Why seed oils are the problem

Seed oils (soya, corn, sunflower, safflower, canola) have become ubiquitous in modern food processing. They're cheap, shelf-stable, and heavily subsidised. They're also extremely high in omega-6 polyunsaturated fats and extremely low in omega-3.

When you eat processed food, you're eating seed oil. When you eat restaurant food, you're eating seed oil. When you eat vegetable shortening, margarine, or "vegetable oil" in bulk cooking, you're eating seed oil. Collectively, these fats are feeding inflammation.

This isn't about vilifying any single macronutrient. It's about the ratio. A traditional diet might have had a 1:1 or 3:1 omega-6 to omega-3 ratio. Modern diets are 20:1 or 30:1.⁴ That massive skew toward omega-6 creates a persistently inflammatory environment that endometriosis exploits.

For endometriosis specifically, the priority is reducing seed oil intake aggressively. Cook with butter, ghee, coconut oil, or olive oil. Avoid ultra-processed foods. Read labels: if "vegetable oil" is listed, put it back. Reduce restaurant eating where possible. These shifts reduce your inflammatory load substantially.

Xenoestrogens: chemicals that confuse your hormones

Xenoestrogens are synthetic chemicals that mimic oestrogen in your body. They're everywhere: in plastics (bisphenol A, or BPA), in pesticides, in personal care products, in non-stick cookware (PFOA).⁵ They're absorbed through your skin and digestive system and they activate oestrogen receptors.

In endometriosis, where local oestrogen production is already elevated, additional xenoestrogen exposure amplifies the problem. The body doesn't distinguish between natural oestrogen and synthetic xenoestrogens. The receptor gets activated either way.

You cannot eliminate xenoestrogen exposure entirely. But you can reduce it substantially. Use glass or stainless steel food storage instead of plastic. Avoid non-stick cookware (cast iron or stainless steel instead). Buy organic for foods with high pesticide residue (berries, leafy greens, stone fruits). Avoid products with parabens or phthalates. Filter your water if possible.

These changes are not magic. They reduce your xenoestrogen load, but they don't eliminate it. They're part of the broader strategy to reduce the inflammatory and oestrogenic environment that sustains endometriosis.

The anti-inflammatory protocol

Build your diet around whole foods with proven anti-inflammatory properties. Prioritise fatty fish 2-3 times weekly for omega-3s. Eat red meat and organ meats for iron, B vitamins, and other micronutrients that support resilience. Include berries for their anthocyanins (anti-inflammatory compounds). Leafy greens for their micronutrient density. Olive oil for polyphenols.

Actively reduce seed oil intake. Stop cooking with vegetable oil. Stop buying ultra-processed foods where seed oil dominates. This single shift reduces inflammatory load more than any supplement.

Avoid, or minimise, foods known to worsen prostaglandin production and inflammation: processed sugar, refined carbohydrates, excess alcohol. These amplify the inflammatory state that endometriosis creates.

Add foods with documented anti-inflammatory activity: turmeric (curcumin is a powerful anti-inflammatory), ginger, dark chocolate (cocoa polyphenols), berries, green tea (EGCG compound).

Consider supplementation: omega-3 (fish oil or algae, 1000-2000 mg EPA+DHA daily), curcumin (500-1000 mg daily with black pepper to enhance absorption), and magnesium (300 mg daily) all have research support in endometriosis.

You are not curing endometriosis with food. You are starving the inflammation that sustains it. Alongside your medical care, that matters.

What complementary care means

Complementary means alongside, not instead of. Your specialist's treatment (hormonal, surgical, or both) is the foundation. Your nutrition is the supporting structure. Together, they create the environment where you feel best and the disease progresses most slowly.

Some women find that a rigorous anti-inflammatory diet substantially reduces their pain. Others find it helps but doesn't eliminate symptoms. Medical treatment may still be necessary or beneficial. That's not a failure of nutrition. That's the reality of a complex disease.

Track your symptoms, your food, and your supplement intake for 3-6 months. Notice what helps. Discard what doesn't. Work with your GP and specialist to integrate any supplements you're taking, particularly if you're on hormonal treatments, as some supplements can interact.

Why whole food matters more than supplements

You could take a curcumin supplement, an omega-3 supplement, a magnesium supplement, and feel like you've done your bit. But you'd be getting isolated compounds. Whole foods arrive bundled with their supporting nutrients, enhancing absorption and efficacy.

A piece of wild salmon provides omega-3s (EPA and DHA) alongside vitamin D, selenium, B vitamins, and astaxanthin, a powerful antioxidant. A curcumin tablet provides curcumin. They're not the same.

Turmeric in food, combined with black pepper (which enhances curcumin absorption) and fat (which aids absorption), is more bioavailable and more protective than a curcumin supplement taken alone. Berries eaten whole provide anthocyanins alongside fibre, polyphenols, and minerals. A berry supplement isolates one compound.

Whole food nutrition is more expensive in time (you have to cook) but cheaper in cost and more effective in outcome. Prioritise it. Supplements fill the gaps. They don't replace the foundation.

The women who see the most pain relief are those eating well consistently, not those taking perfect supplements alongside a mediocre diet. The foundation is food. Everything else is support.

The bottom line

Endometriosis is an inflammatory disease worsened by oestrogen. Nutrition cannot cure it, but anti-inflammatory food choices, adequate omega-3 fats, minimal seed oils, and careful xenoestrogen avoidance reduce pain and slow progression. These strategies are evidence-supported and complementary to medical care. Start with your specialist. Then use food as the supporting lever. Together, they create the best possible outcome.

References

1. 1. Saunders PTK, Horne AW. Endometriosis: etiology, pathobiology, and therapeutic prospects. Cell. 2021;184(11):2807-2824. https://pubmed.ncbi.nlm.nih.gov/34048704/
2. 2. Nodler JL, DiVasta AD, Vitonis AF, et al. Effect of omega-3 polyunsaturated fatty acid on endometriosis. Clinics. 2025. See also: https://pmc.ncbi.nlm.nih.gov/articles/PMC12051631/
3. 3. Missmer SA, Chavarro JE, Malspeis S, et al. A prospective study of dietary fat consumption and endometriosis risk. Human Reproduction. 2010;25(6):1528-1535. https://pubmed.ncbi.nlm.nih.gov/20332166/
4. 4. Simopoulos AP. The importance of the ratio of omega-6/omega-3 essential fatty acids. Biomedicine & Pharmacotherapy. 2002;56(8):365-379. https://pubmed.ncbi.nlm.nih.gov/12442909/
5. 5. Vabre P, Gatimel N, Moreau J, et al. Environmental pollutants, a possible etiology for premature ovarian insufficiency: a narrative review of animal and human data. Environmental Health. 2017;16(1):37. https://pubmed.ncbi.nlm.nih.gov/28388912/