When I've got my digestive system operating at peak performance, everything else seems to feel better. No bloating, oodles of energy, more motivation equals a rise in productivity, activity and generally getting more out of my days.
Keeping your gut in balance can be tricky. Nutritionist Rene Schliebs says keeping stress levels low and maintaining a diet free of refined sugars should keep things in check.
But when we get sick or take antibiotics our bellies are packed with bagfulls of bad bugs, and the goodies are over-powered. The best way to boost numbers is by eating probiotics, says Schliebs, a medical herbalist and specialist in women's health.
Probiotics - which can be taken as a supplement or eaten in fermented foods like yoghurt and miso soup - establish the flora in the digestive system and make sure everything runs smoothly.
Schliebs believes nearly all of our immunity is based on the health of our gut, so if it's not operating smoothly, you're more prone to illness.