Assignment task:
Alexandrov (2018) The authors conducted a cross-sectional study and state that future prospective research should be conducted on this topic: "Long-term, prospective studies of the influence of different dietary protein sources on muscle mass should be conducted, in order to formulate recommendations for interventions aimed at building and preserving muscle mass in different age groups." How would you design such a study and what might the challenges be with designing and executing your study?