Emily Leeming, a dietitian and gut microbiome researcher at King's College London.Bree DunbarSnacking can be an easy way to eat more fiber and boost gut health.Fiber helps fuel the "good" microbes in the gut, which influence overall health.Emily Leeming, a gut health scientist and chef, snacks on dark chocolate and fruit.Snacking can be a great way to eat more fiber and look after your gut health, Emily Leeming, a dietitian and gut microbiome researcher at King's College London, told Business Insider.The gut microbiome is the name given to the trillions of microbes that live in the colon lining, which studies have linked to our overall health — from the immune system to the brain.Fiber, found in foods such as fruit, vegetables, whole grains, and beans, fuels the "good" microbes in the gut.