Researchers at Lancaster University propose that inflammation from harmful bacteria may contribute to breast cancer. Their hypothesis—though unproven—is supported by evidence linking bacterial inflammation to cancer development.
The team recommends a simple, affordable strategy: women consuming natural yogurt daily.
Yogurt contains beneficial lactose-fermenting bacteria, similar to the microflora in the breasts of breastfeeding mothers.
Dr. Rigby notes: "We now know breast milk is not sterile and lactation changes the breast's microflora."
"Lactose-fermenting bacteria, common in milk, likely inhabit women's breast ducts during breastfeeding and possibly for some time afterward."
These bacteria appear protective, with each year of breastfeeding reducing breast cancer risk by 4.3%.
Several studies link yogurt consumption to lower breast cancer risk, possibly as beneficial bacteria displace harmful ones.
The human body contains about 10 billion bacterial cells; most are harmless, but some produce toxins that trigger inflammation.
Chronic inflammation targets harmful bacteria but also damages tissues. Periodontitis (gum disease), for instance, is associated with oral, esophageal, colon, pancreatic, prostate, and breast cancers.
The researchers conclude: "Microflora influences stem cells that line mammary ducts. In the colon and stomach, certain bacteria raise cancer risk."
"A parallel mechanism likely exists in the breast, where resident microflora impacts stem cell division and cancer risk."
