1 in 10 women has endometriosis. No calorie tracker was built for them.
Endometriosis isn't just a period problem. It's an inflammatory, hormonal condition, and it shapes your energy across the month in ways a flat daily calorie target cannot see. The nutrition research is thinner than the internet suggests, and this page says where.
How Endometriosis affects what you eat
Endometriosis is an oestrogen-dependent inflammatory condition. Studies report lower pain scores on anti-inflammatory eating patterns, though an umbrella review grades every diet finding in endometriosis in its weakest evidence category, and the 2022 ESHRE guideline makes no nutrition recommendation at all. Researchers describe the menstrual phase as the most symptomatic. Oli does not act on any of that: what it does is know which phase you are in, and move your calorie and macro targets with it.
What your body needs most
The nutrient with the most trial attention for period pain. Later meta-analyses report a benefit, though heterogeneity is high and Cochrane rated the underlying evidence low quality. The trials used supplement doses, not meal-sized amounts.
Frequently recommended for cramping, though it does not appear in the 2016 Cochrane review of supplements for period pain at all. Leafy greens, pumpkin seeds and legumes are the usual food sources.
Oxidative stress in the peritoneal environment is one of the mechanisms researchers study in endometriosis. Whether dietary antioxidants change symptoms has not been established in trials.
Research describes a role for the gut in clearing oestrogen, which is relevant because endometrial lesions respond to it. The link from fibre intake to symptoms has not been tested directly.
Heavy menstrual bleeding is common with endometriosis, and clinical sources identify it as a leading cause of iron-deficiency anaemia. Iron status is measured with a blood test, not estimated from food.
Laboratory work points at NF-κB, an inflammatory pathway studied in lesion development. Curcumin trials used concentrated supplements with piperine, because turmeric as a spice is poorly absorbed.
Foods to eat more of
The richest dietary source of long-chain omega-3, the nutrient most studied for period pain.
Contains lignans, a phytoestrogen studied for its interaction with oestrogen, plus omega-3 and fibre.
A source of DIM, a compound researched for its role in how the body processes oestrogen. Broccoli, cauliflower and Brussels sprouts.
Curcumin studies are laboratory and supplement based; dietary turmeric is poorly absorbed, which is why black pepper is usually suggested alongside it.
Iron, magnesium, folate, and antioxidants in one food group.
Concentrated antioxidants with minimal sugar load.
A convenient source of both zinc and magnesium.
Foods to cut back
Associated with higher endometriosis risk across several cohort studies. These are observational associations, not proven cause and effect.
Raises oestrogen levels and depletes magnesium and B vitamins.
Diets high in these are associated with higher inflammatory markers in the research.
Associated with increased risk of endometriosis diagnosis in cohort studies.
Phytoestrogens in large amounts may be counterproductive for oestrogen-dominant conditions. Moderate fermented soy (miso, tempeh) is generally well-tolerated.
How your cycle interacts with Endometriosis
Endometriosis symptoms peak during the menstrual phase (days 1–5) and can worsen in the late luteal phase (days 24–28). Oli holds a separate calorie and macro profile for all four phases, not just your period, and glides your daily target between them.
Explore cycle nutrition →Endometriosis, nutrition and your questions
What foods should I avoid with endometriosis?
Cohort studies associate red and processed meat intake with higher endometriosis risk, and researchers point to alcohol (which raises circulating oestrogen), trans fats and refined sugar as drivers of the systemic inflammation linked to pain. These are associations from observational research rather than proven cause and effect: a registered dietitian can help translate them into an individual plan.
Can diet really reduce endometriosis pain?
Diet cannot cure endometriosis, but studies report lower pain scores with anti-inflammatory eating patterns, and omega-3 intake has been linked to reduced pain in several trials, though Cochrane rated that body of evidence low or very low quality and the doses used were supplements rather than food. Medical bodies consistently describe nutrition as a complement to medical treatment, not a replacement for it.
What is the best diet for endometriosis?
There is no single named "endo diet" with strong trial evidence. The pattern the research most consistently points to is Mediterranean-style anti-inflammatory eating: fatty fish, plenty of vegetables and fibre (which supports oestrogen clearance through the gut in research), olive oil, nuts and seeds, with limited red meat, alcohol and processed food.
Is dairy bad for endometriosis?
The published evidence doesn't support cutting dairy across the board: several large studies actually associate dairy intake with lower endometriosis risk. Clinicians note that individual tolerance varies, and typically suggest a structured, time-limited trial with a professional rather than permanent restriction when someone suspects a link.
Should I eat differently during my period with endometriosis?
Researchers describe the menstrual phase as the most symptomatic and nutritionally demanding: menstrual bleeding (often heavy with endometriosis) depletes iron, and omega-3s and magnesium are the nutrients most studied for cramping. Oli tracks calories and macros rather than individual nutrients, so it will not count your iron: what it does is carry a separate calorie and macro target for your menstrual phase.
Important: The evidence for diet in endometriosis is weak: the 2022 ESHRE guideline makes no nutrition recommendation, and an umbrella review graded every diet finding in its weakest category. Nutrition does not treat or cure the condition. Always work with your gynaecologist, GP, or registered dietitian for a complete management plan. This page summarises published research and guidance from the health authorities listed under Sources. It is educational content, not medical advice, and Oli is not a medical provider.