New research attempts to explain the link between gut health and breast cancer

Last updated: October 23, 2026 | 06:40

Researchers have found differences in the gut bacteria of some people with breast cancer, along with mechanisms that could plausibly influence the disease. Shutterstock

Scientists are uncovering links between the microbes in our intestines and breast cancer, from how hormones are recycled to how patients respond to treatment. But, experts caution, a link is not a cause.

The human gut is home to trillions of microorganisms, and their work extends far beyond digestion. They break down food, communicate to the immune system, regulate inflammation and even influence how hormones circulate through the body.

Now researchers are asking a more provocative question: Could the bacteria in our intestines have something to do with breast cancer?

The findings demand careful reading.…