Endometriosis affects approximately 1.5 million women in the UK and takes an average of 8 years to diagnose. While diet cannot treat endometriosis, there is growing evidence that dietary modification can meaningfully reduce symptom severity — particularly pain and fatigue — through anti-inflammatory mechanisms. This guide covers the current evidence. See our anti-inflammatory diet guide and our omega-3 guide for the foundational nutritional context.
The inflammation-endometriosis connection
Endometriosis is fundamentally an inflammatory condition — characterised by the presence of endometrial-like tissue outside the uterus, surrounded by chronic inflammatory lesions. Prostaglandins (pro-inflammatory eicosanoids) are elevated in endometriosis and directly drive the dysmenorrhoea (painful periods) that is the condition's most common symptom. Dietary interventions that reduce systemic inflammation and prostaglandin production are therefore a logical therapeutic target.
The omega-3 and endometriosis evidence
Research has found that women with higher dietary omega-3 intake (EPA and DHA from oily fish) have lower rates of laparoscopically confirmed endometriosis. The mechanism: EPA and DHA shift prostaglandin synthesis toward less inflammatory series 3 prostaglandins and away from the more inflammatory series 2 prostaglandins that drive endometriosis pain. Two portions of oily fish weekly, or algal DHA/EPA supplementation for those who do not eat fish, is the practical recommendation. See our omega-3 complete guide.
Dietary patterns and endometriosis
A 2024 systematic review found consistent associations between higher fruit and vegetable intake, higher omega-3 consumption, and reduced endometriosis risk and symptom severity — and between higher red and processed meat consumption and increased risk. The Mediterranean dietary pattern, which naturally delivers high fruit, vegetable, and oily fish intake alongside moderate olive oil and low processed meat, is the dietary pattern most consistently aligned with the endometriosis evidence base.
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Frequently asked questions
Is there a specific diet proven to treat endometriosis?
No dietary pattern has been shown to treat endometriosis in the clinical sense of eliminating lesions or reversing the condition. Dietary intervention has evidence for reducing symptom severity — particularly pain and fatigue — through anti-inflammatory mechanisms. It is a meaningful complement to medical management, not a replacement for it.
Does dairy consumption worsen endometriosis symptoms?
The evidence on dairy and endometriosis is mixed and does not support a firm recommendation to eliminate it. Some research suggests saturated fat from full-fat dairy may contribute to prostaglandin-driven inflammation, while calcium and vitamin D from dairy have anti-inflammatory properties. The Mediterranean dietary pattern, which includes moderate dairy, has the most consistent evidence for reducing endometriosis risk — suggesting wholesale dairy elimination is not necessary.
Can a gluten-free diet help with endometriosis pain?
A 2012 Italian study found that women with endometriosis who followed a gluten-free diet for 12 months reported significant reductions in pelvic pain scores. However, this was a single study and the mechanism is not well established. The improvement may reflect reduced intestinal inflammation rather than a direct endometriosis effect. It is worth discussing with a registered dietitian before undertaking a restrictive dietary approach.
Should women with endometriosis avoid phytoestrogens like soy?
The evidence does not support blanket avoidance of phytoestrogens for endometriosis. Some research suggests phytoestrogens may actually inhibit the oestrogen receptors on endometrial lesions due to their weaker oestrogenic activity. The research is not conclusive, and the picture is complicated by the variability in individual gut metabolism of phytoestrogens. Moderate soy consumption is unlikely to cause harm, but women who are concerned should discuss it with their specialist.
How quickly can dietary changes affect endometriosis symptoms?
Meaningful changes in dietary pattern — such as increasing omega-3 intake and reducing red and processed meat — typically take two to three menstrual cycles to produce noticeable effects on symptom severity, if they are going to. This reflects the time required for prostaglandin synthesis patterns to shift in response to changed fatty acid availability. Consistency over at least three months is needed before drawing conclusions about a dietary intervention.