The Claim
A high-fiber, low-fat dietary intervention administered over one year reduces serum bioavailable estradiol concentration by 13 pmol/L in women with a history of breast cancer, independent of weight loss.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Women with a history of breast cancer who follow a high-fiber, low-fat diet for one year have a 13 pmol/L reduction in bioavailable estradiol in their blood, regardless of whether they lose weight.
See the scientific wording
A high-fiber, low-fat dietary intervention for one year significantly reduces serum bioavailable estradiol concentration by 13 pmol/L in women with a history of breast cancer, independent of weight loss, suggesting a potential biological pathway through which diet may influence post-diagnosis hormonal environments.
Eating more fiber causes estrogen to stick to waste in the gut, so less of it gets recycled back into the blood. This lowers the amount of active estrogen circulating in the body.
What the research says
1 studyIn women who had breast cancer, eating more fiber and less fat for a year lowered the active estrogen in their blood by about 13 points—even without losing weight. This suggests diet might help control hormones that affect breast cancer risk.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.