The Center of Weight Loss and Nutrition (DoktorFit.edu.pl) deals with promoting proper nutrition and a healthy lifestyle. We want to support people in working on changing their eating habits and inspire to take on this challenge. We pursue this objective through education and development of substantive, didactic and psychological competences of the staff of specialists of dietary centers necessary in working with the client. Doktor Fit grants the COiO Quality Label to facilities providing comprehensive dietetic services (diagnostics, nutrition consultancy, supplementation) combined with professional psychological support (coaching, training, mentoring) Obtaining the COiO Quality Mark means that the service meets not only basic requirements, but also above-standard ones. It stands out for its high values, uniqueness and effectiveness in comparison with other services of this type.