There are a lot of fad diets out there that claim to be the best and fastest ways you can lose weight. One diet that's created a lot of buzz is the ketogenic diet (or "keto diet" for short). Aside from helping you drop a few pounds, these diets can have some unwanted side effects to go along with lower digits on your scale. The keto diet, in particular, can cause your breath to have an unpleasant odor. There's even a name for it – ketosis breath. If you're planning to go on the keto diet, we'll let you know what it is, what side effects you can expect, and how to manage the ketosis breath you may experience.