2.3.1. Omnivore Diet
During phase 2, the existing dietary habits should be maintained and not explicitly adapted. All participants followed an omnivorous diet at the beginning of the study. During the omnivorous phases (phase 1 and 2), all animal- and plant-based foods were allowed to be consumed. There were no restrictions on food choices. People who were already following a vegan lifestyle or a vegetarian diet could not participate in the study. Furthermore, there were no guidelines on the macronutrient distribution.