Oestrogen Dominance: Symptoms, Causes, and Nutritional Solutions
Oestrogen dominance is one of the most prevalent hormonal patterns in women, and one of the least well understood. It does not simply mean high oestrogen. It means oestrogen is elevated relative to progesterone, or that oestrogen is being metabolised into more reactive, inflammatory pathways, creating a net pro-oestrogenic state that drives symptoms across multiple body systems.
What Is Oestrogen Dominance?
Oestrogen dominance is a relative imbalance, not necessarily an absolute excess. It can occur when:
• Oestrogen levels are genuinely elevated (high dietary exposure, obesity, impaired liver detoxification)
• Progesterone is insufficient relative to oestrogen (common in perimenopause and with anovulatory cycles)
• Oestrogen metabolism is dysregulated, producing excess reactive catechol oestrogen metabolites (relevant to COMT and MTHFR variants)
• The oestrobolome is disrupted, allowing oestrogen to recirculate rather than be excreted (see gut-brain axis)
Symptoms of Oestrogen Dominance
• Heavy, painful, or clotty periods
• Breast tenderness and fibrocystic breast changes
• Bloating and fluid retention, particularly premenstrually
• Mood swings, anxiety, and irritability in the luteal phase
• PMDD
• Worsening of histamine intolerance (oestrogen stimulates mast cell histamine release)
• Fatigue and brain fog
• Low libido
• Weight gain, particularly on hips, thighs, and abdomen
• Endometriosis, uterine fibroids, and ovarian cysts (all oestrogen-sensitive)
Nutritional Strategies for Oestrogen Dominance
Support Liver Oestrogen Metabolism
The liver metabolises oestrogen in two phases. Phase I converts oestradiol into catechol oestrogens. Phase II (primarily glucuronidation, sulfation, and methylation) packages these metabolites for excretion. Supporting both phases is therapeutic:
• Cruciferous vegetables (broccoli, kale, cabbage, Brussels sprouts) contain glucosinolates that upregulate Phase I CYP1A2 metabolism toward the safer 2-OH oestrogen pathway
• DIM (diindolylmethane) from cruciferous vegetables shifts oestrogen metabolism away from the 16-OH (proliferative) pathway
• Calcium-D-glucarate inhibits beta-glucuronidase and supports Phase II glucuronidation
• Methylation support (methylated B vitamins) supports the COMT-mediated Phase II methylation of catechol oestrogens
Restore the Oestrobolome
A healthy, diverse gut microbiome maintains beta-glucuronidase at appropriate levels. Dysbiosis elevates it, causing excess oestrogen reabsorption. High-fibre diet (30+ plant foods per week), fermented foods, and addressing gut dysbiosis directly restore oestrobolome function.
Reduce Xenoestrogen Exposure
Environmental oestrogens (xenoestrogens) from plastics (BPA, phthalates), pesticides, and synthetic fragrances bind oestrogen receptors and add to the oestrogenic load. Reducing plastic food storage, choosing organic where possible, and avoiding synthetic fragrance products reduces this burden.
Maintain Healthy Body Composition
Adipose tissue produces oestrogen via aromatase enzyme activity. Excess adiposity, particularly visceral fat, directly increases circulating oestrogen. Anti-inflammatory dietary patterns, adequate protein, and resistance training reduce aromatase activity and oestrogen production from adipose tissue.
Dealing with heavy periods, PMDD, or hormonal symptoms?
Book a Clinical Case Assessment with Kirstie to explore whether oestrogen dominance is a factor and what a personalised approach looks like for you.
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