Endometriosis is a complex inflammatory condition. While diet is not a cure and should never replace medical or surgical treatment, there is reasonable evidence that certain dietary patterns may help reduce inflammation and support symptom management for some women.
This guide reviews what the current research suggests, with realistic expectations.
Setting Realistic Expectations
Before exploring specific foods, it is important to be clear about what dietary changes can and cannot achieve:
- Diet cannot remove endometriotic disease from the pelvis
- Diet does not replace the need for specialist assessment when symptoms are significant
- Response to dietary changes varies significantly between individuals
- Benefits, when they occur, are usually gradual over weeks to months
- The strongest evidence relates to inflammation and general wellbeing rather than direct effects on endometriosis
For many women, dietary changes form part of a broader management plan alongside medical treatment, specialist surgery where indicated, and pain management strategies.
Foods That May Help
### Anti-Inflammatory Foods
The foundation of most endometriosis-supportive dietary approaches is an anti-inflammatory pattern, similar to the Mediterranean diet:
- Oily fish (salmon, mackerel, sardines) — rich in omega-3 fatty acids
- Leafy green vegetables (spinach, kale, rocket) — high in antioxidants
- Berries — blueberries, raspberries, blackberries contain anti-inflammatory compounds
- Nuts and seeds — particularly walnuts, flaxseed, and chia seeds
- Extra virgin olive oil — the main fat source in Mediterranean diets
- Cruciferous vegetables — broccoli, cauliflower, Brussels sprouts
### Iron-Rich Foods
Heavy menstrual bleeding is common in endometriosis and can lead to iron-deficiency anaemia. Supporting iron intake is important:
- Red meat (in moderation)
- Dark poultry
- Lentils and pulses
- Dark leafy greens
- Iron-fortified cereals
- Pumpkin seeds
Pairing plant sources of iron with vitamin C (citrus, peppers, strawberries) improves absorption.
### Fibre
A higher-fibre diet supports healthy oestrogen metabolism and bowel function — particularly relevant for women with bowel symptoms or constipation:
- Whole grains (oats, quinoa, brown rice)
- Legumes (beans, chickpeas, lentils)
- Fruits with skins
- Vegetables
Foods Some Women Find Helpful to Limit
The evidence here is less robust than for anti-inflammatory foods, but many women report benefit from reducing:
- Ultra-processed foods — high in refined sugars and inflammatory fats
- Trans fats — found in some processed snacks and baked goods
- Excess red and processed meat — linked in some studies to higher endometriosis risk
- Excess alcohol — may affect oestrogen metabolism
- Excess caffeine — varies individually; some women find it worsens symptoms
- Refined sugar — linked to inflammation
Whether to reduce or exclude dairy and gluten is more individual. There is no strong general evidence, but some women with endometriosis find these worsen their symptoms. Working with a registered dietitian can help identify any personal triggers.
Vitamin D
Vitamin D deficiency is common in Ireland due to limited sunlight exposure, particularly in winter. Some research suggests lower vitamin D levels may be associated with more severe endometriosis symptoms. Supplementation at the HSE-recommended dose is often worth discussing with your GP, particularly if you have tested low.
What About Specific Diets?
- Mediterranean diet: The best-supported overall pattern — rich in plants, oily fish, olive oil, and whole grains.
- Low-FODMAP diet: May help if you also have bowel-predominant symptoms or coexistent IBS. Should be followed with dietitian support as it is not a long-term eating plan.
- Gluten-free: Only relevant if you have coeliac disease or non-coeliac gluten sensitivity. Some small studies suggest benefit in endometriosis, but evidence is limited.
- Dairy-free: Variable individual response; not supported by strong general evidence.
Practical Starting Points
If you want to try dietary changes, consider a gradual approach:
1. Increase oily fish intake to 2-3 portions per week 2. Aim for 5-7 portions of vegetables and fruit daily, emphasising variety and colour 3. Swap refined grains for whole grains 4. Reduce ultra-processed foods and added sugar 5. Use olive oil as your main cooking fat 6. Keep a symptom and food diary for 4-6 weeks to identify personal patterns
Changes should be given at least 6-8 weeks to show any effect.
Diet Alongside Medical Care
Dietary changes work best alongside proper medical assessment and treatment. If you have significant endometriosis symptoms — chronic pelvic pain, painful periods, fertility difficulties, or bowel/bladder symptoms — specialist review is important.
Prof Mahmood provides comprehensive endometriosis care at Bon Secours Hospital Limerick, including assessment, advanced surgical treatment where indicated, and multidisciplinary support for lifestyle factors.