Self Selection of Diet

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Abstract
Only 9 out of 31 animals 21 days old selected casein and exhibited some growth when offered a choice of that protein, sucrose, hydrogenated vegetable oil, and salts. The other 22 died at an average age of 58 days. About 60% of either 6-week old or 12-week old animals selected casein and gained weight. Younger animals showed more preference for fat and less preference for sucrose than older rats. During pregnancy, the intake of salts increased.