1929 28 June Suppl. p. x Some change in the pancreas occurs which reduces its output of a secretion which transforms sugar into a form useful for energy and muscle building.
1945 (Min. of Food) xix. 71 When the main course for dinner has been decided, the supper can then be selected to give variety, again starting with the ‘muscle-building’ food.
2000 (Electronic ed.) 9 Feb. Women..have eight times less of the male hormone testosterone which is responsible for muscle building.