A common type of bacteria found in our intestines may play a role in the development of colon cancer, scientists say.

Enterococcus faecalis is one of the bacteria that naturally live in the gut, helping it to function properly.

However, research published in Medical Microbiology suggests that in certain situations – particularly among susceptible individuals – it may also produce oxygen molecules that damage DNA and lead to cancer.

“This research puts into perspective the complexity of the effects normal gut bacteria can have on the health of an individual,” commented study leader professor Mark Huycke of the Department of Veterans Affairs Medical Centre in Oklahoma City.

However, despite these findings, experts want people to remember that not all bacteria is created equal – most bacteria is vital for good digestion and health.

In fact, a variety of probiotic products currently on the market promise to introduce helpful bacteria to the intestine in order to combat their harmful counterparts.

In addition to fortified yogurts, foods that have probiotic qualities include sauerkraut, tempeh, the fermented milk drink kefir, miso and Korean condiment kimchi.