Along with probiotics, prebiotics and phytobiotics should also be taken to keep the intestines healthy.
Probiotics: The good bacteria present in probiotics support mental health and digestion. So you should eat yogurt that contains probiotics.
Prebiotics: Prebiotics contain fiber and carbohydrates that can be fermented and digested by the bacteria in the intestines. These provide good bacteria energy and support their growth. So they should be taking plenty of asparagus, bananas, greens, onions, garlic, ginger, chicory and artichokes.
Phytobiotics: They are high in flavonoids that protect and support the growth of good bacteria and repel bad bacteria. So you should eat apples, grapes, dark chocolate and berries that contain phytobiotics.