“…This type of experiment has been criticized on the grounds that, since the animals were allowed to consume the diets ad libitum and growth rate depends primarily on the caloric intake, the greater palatability of the diet containing the wholemeal, and not the higher nutritive value of its protein, was the factor responsible for the better performance of the rats eating it (Wright, 1941). Mitchell, Hamilton and Shields (1943), however, settled this point by showing that the weight increase of young rats on a diet of wholemeal bread was greater than that of littermates on a diet of white bread, whether the consumption of the former was limited to that of the latter, or whether both diets were freely consumed.…”