Dr. Grzegorz Zydek is a Doctor of physical culture, specialist dietitian, and expert in nutrition and supplementation in sports. For over 10 years, he has been a teaching employee of the Academy of Physical Education. Currently, he is a teaching assistant at the Department of Sports Theory, Nutrition and Supplementation, and a Dietitian of the Sports Club of the Academic Sports Association of the University of Physical Education in Katowice. He spoke at the conference of the Medical Commission of the Polish Olympic Committee "Nutrition of Active People 2013", and has conducted numerous training courses on the latest trends in sports nutrition and supplementation. He is the co-author of many publications in the field of nutrition and strength training, as well as academic textbooks. He cooperated as a dietitian and supplementation expert with the first teams of football clubs such as Podbeskidzie Bielsko-Biała, Odra Wodzisław Śląski, Korona Kielce, Górnik Zabrze. Since 2018, he has been cooperating as a nutrition expert with the first football and volleyball teams of GKS Gieksa Katowice S.A. In the years 2010-2014 and from 2016 to this day, he has cooperated with the Gliwice Club Sportowy Piast S.A. in the field of nutrition and supplementation for the first team and youth teams. Since 2008, he has been practicing in the field of nutrition counseling for professional athletes and physically active people.