Most of the bacteria in your colon is good and you need this bacteria to be and remain constantly healthy. Most people do not have the adequate amount of "friendly bacteria" and diet and medications throw the body's good and bad bacteria out of balance. One great way to remain in balance is to eat Greek style yogurt as well as organic fruits and vegetables. I also recommend a great probiotics product from New Chapter called: Immunity. Keeping a healthy colon is essential to having a healthy body. This is not an option as it is vital.