The gut is home to trillions of microorganisms, and they are not simply passive passengers. Many of them depend on parts of food that the human digestive system cannot fully break down, especially dietary fibre and resistant starch.That makes food an important part of the gut environment. Research suggests that increasing fibre can produce consistent changes in gut bacterial communities, although the response varies from person to person.The idea is not to find one magical "gut-healing" food. A better approach is to give gut bacteria different kinds of plant material regularly. Here are 10 simple foods worth bringing into the everyday Indian diet.