These Guidelines target all professional groups involved in the diagnosis and management of NAFLD: Internists, gastroenterologists, endocrinologists, diabetologists, obesity specialists, surgeons, clinical nutritionists, radiologists, specialists in pediatrics and adolescent medicine, pathologists, cardiologists, transplant physicians, patient representatives/advocacy groups as well as affected parties, family members and serves as information for benefits providers (health insurers, pension insurance funds). The German College of General Practitioners and Family Physicians (DEGAM) was invited to collaborate but declined to participate. Nevertheless, we deem these Guidelines to be equally relevant for general practitioners and family physicians.