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Journal of Nutrition Vol. 109 No. 5 May 1979, pp. 827-831
Copyright © 1979 by American Society for Nutrition
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Effect of Mineral Mixture in Diet on Protein Intake Regulation in the Weanling Rat1,2,3,

Carol E. Leprohon, Terri L. Woodger, David V. M. Ashley and G. Harvey Anderson

Department of Nutrition and Food Science, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada

Weanling rats fed a choice of two diets varying only in protein concentration (10 and 60% casein) select a lower proportion of dietary energy as protein when the dietary minerals are supplied by a mineral mixture high in Na, K, and Cl but low in P and Cu (Hi Cl) than when the diets contain the Bernhart-Tomarelli (BT) mineral mixture. The addition of Na and/or K as acetate salts to the BT mineral mixture, to levels in the Hi Cl mixture, had no effect on regulation of protein intake. However, the addition of Na and/or K as chloride salts to the BT mineral mixture resulted in the rats selecting a protein concentration equivalent to the Hi Cl fed group. Weight gains and energy consumption were similar for all groups. It was therefore concluded that dietary chloride affects protein feeding behavior.

KEY WORDS: • self-selection • protein intake regulation • mineral mixtures • chloride

1 Supported by Grant MA 6006 from the Medical Research Council of Canada.

2 Presented in part at the Canadian Federation of Biological Sciences Meeting in Calgary, June, 1977. Anderson, G. H., Leprohon, C. &Ashley, D. V. M. Effect of mineral mixture in diet on protein intake regulation by the weanling rat. Proc. Can. Fed. Biol. Soc. 20, 762 (Abstr.).

3 Address reprint requests to G. H. Anderson.

Manuscript received 19 July 1978.




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