The gastrointestinal (GI) system comprises an incredible 10 trillion bacteria, with a healthy GI system having an ideal balance of good and bad bacteria. These bacteria are needed to digest our food, maintain healthy digestion and keep our immune system strong. However, many lifestyle factors and medications can upset this ideal balance, which can result in stomach upset, diarrhoea or infection. For example, when taking a course of antibiotics, both good and bad bacteria are killed, sometimes resulting in diarrhoea, …