With a sustainable lifestyle change based on sufficient exercise and a balanced diet, many chronic diseases (obesity, high blood pressure, diabetes, metabolic syndrome) can be alleviated, cured or their onset prevented. Those affected from chronic diseases find it difficult to change their lifestyle permanently. Intervention programs are often not geared towards sustainable behavioral change and take too little account of the individual's motivational factors. As a result, those affected revert to old patterns after a while. The applied research project "Sustainable Lifestyle Change", which is the subject of this book, deals with the question of how "sticking to" a healthy lifestyle can be supported from the perspective of motivational psychology and service orientation. This specialist book is aimed at people in the healthcare sector (health psychologists, doctors, nutritionists, etc.) as well as applied researchers and explains how affected people can be supportedin "sticking to" a h