Cutting down on sugar delivers a host of health benefits, from minimizing tooth decay to improving mental health . A new study in mice flies in the face of that research, suggesting that a sugar-free diet might have some unintended side effects. Most studies to date have examined the drawbacks of too much sugar , which includes a long list of chronic diseases, such as diabetes . Sugar is a source of energy for us and the bacteria that live in our guts, but it's not necessarily a good one . The