2.2. Study Design
A three-phase study design was created. Initially, all participants were given an explanation of the vegan and omnivorous diet. In the first two-week phase, there was a familiarization of the documentation of the diet, as well as the performance of the maximum strength tests. Subsequently, strength tests were performed and anthropometric data were collected. This was followed by an 8-week control phase with a normal diet (omnivore) (phase 2). In phase 3, all participants changed to a vegan diet for 8 weeks. Three days before the start of phase 3, all participants were informed again about a vegan lifestyle by a sports nutrition coach. In phases 2 and 3, both the strength capacity and anthropometric data were measured every 4 weeks. The nutrition diary was checked every day by an employed sports nutritionist from the gym. All participants were supervised by this person during the entire intervention period. In addition, this person examined the training habits as well as the training plans of the participants. The training habits were not influenced during this time and had to be maintained in all phases. The complete study design is shown in 