Salt Preference and Taste

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  • GOTO Tomoko
    Laboratory of Nutrition, Department of Food Function and Health, Division of Bioscience and Biotechnology for Future Bioindustries, Graduate School of Agricultural Science, Tohoku University
  • KOMAI Michio
    Laboratory of Nutrition, Department of Food Function and Health, Division of Bioscience and Biotechnology for Future Bioindustries, Graduate School of Agricultural Science, Tohoku University

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  • 食塩嗜好と味覚
  • ショクエン シコウ ト ミカク

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Abstract

Sodium (Na) is the most abundant electrolyte in the extracellular fluid and is essential to life. The physiological level of Na in body fluids is constantly maintained. When experimental animals are deprived of sodium, they show an appetite for salt. Although many analyses of the mechanism of salt appetite have been made, there are still many unknown factors. As an implication for the regulatory relation between sodium and other minerals, it has also been reported that NaCl preference increases with a deficiency in calcium or zinc. We previously reported that NaCl preference increases in zinc-deficient rats even after a few days of deficiency. We also found that short-term zinc deficiency decreases hypothalamus hormone secretion, however, the chorda tympani nerve responses to NaCl were maintained and only significantly reduced later with prolonged zinc deficiency. These findings suggest that zinc deficiency may influence sodium metabolism, as the result of a combination of peripheral taste nerve and central nervous system.

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