Randomization
When enrolled in the study, study participants will be allocated to one of the two study groups, e.g., the protein group or the placebo group. Implementing of allocation is performed by handing out a package with powder sachets, either protein or placebo. The researcher handing out the package is blinded and thus does not know what is handed out. All packages contain enough one-portion sachets for one study participant during the full study period of 6 months. The packages are marked by the producer with a random batch number. These numbers contain a letter (A–Z) and three numbers (0–9). The batch numbers are computer-generated, unique, and randomly ordered. All batch numbers correspond to either protein or placebo, which is captured in a document. The document is not opened by the researchers unless unblinding is necessary. All packages that will be used during the full study period are produced at once. Fifty percent is protein, and 50% is placebo. The packages are randomly distributed on pallets from which they are handed out by the researcher. Thus, no block randomization is performed.