It was done by separating 63 individuals into two groups who had to follow their respective diets and following the results. (dietselfhelp.com)
By having each group consume its respective diet concurrently, each group is equally exposed to all these tumultuous processes and events. (westonaprice.org)
But, I doubt either the nutrition professor or the science teacher or would say that their respective diets are the healthiest diets, or that people should eat only junk to lose weight. (straightforwardfatloss.com)