There is an ever-expanding pool of research indicating that your gut health can influence how you think, feel, and function. But if you want the mental and emotional benefits of a healthy gut, you have to give your gut what it needs. The magic that fuels your gut’s psychological impact is bugs—tiny little microorganisms that colonize and reside in your intestine. There are good ones and bad ones, and the overall population is known as your microbiome. There are more than 100 trillion of these microbes inside you. Ideally, you want the good ones to make up the majority of the population. And although you don’t have full control over the population you’ve got, you do have overarching influence. Think of them as pets to be taken care of, or citizens of planet You. You may have heard of probiotics and prebiotics. These are two essential food groups that feed …