Lifestyle is the way human beings relate to each other on the physical, emotional, and mental levels, interacting with spiritual and social aspects. A good lifestyle keeps people in the best condition. It is related to aspects such as food, physical exercise, sleep, breathing, the environment, body hygiene habits, hygiene of feelings, hygiene of thoughts, and happiness. For Neuraltherapeutic Medicine and all conceptions of medicine, a good lifestyle is necessary to maintain good health conditions and to achieve a good therapeutic response. This chapter specifies definitions in this regard and sets out some general recommendations that should be expanded and specified in each particular case.