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- W1505484384 abstract "Fourteen elderly subjects, four male and 10 female, 73 ± 5 years old, were studied for the relationships between plasma tryptophan concentration, tryptophan intake, and tryptophan requirement. The diet was based on an L-amino acid mixture, patterned as in egg protein, and provided N equivalent to 0.5 g protein/kg body weight. After an initial 5- to 10-day period at a tryptophan intake of 10 mg/kg/day (four subjects) or 5 mg/kg/day (10 subjects), there followed consecutive, isonitrogenous 4-day periods at graded reductions in tryptophan intake to 0.5 mg/kg/day. Fasting and 3½-hour postprandial plasma tryptophan levels were determined at the end of each diet period. Plasma tryptophan concentration decreased as tryptophan intake was reduced to the 2 mg/kg/day level. Thereafter, it remained relatively constant with further reductions in the intake level. These data indicate that the mean minimum tryptophan requirement of healthy, elderly subjects approximates 2 mg/kg body weight/day, lower than the value of about 3 mg/kg (J. Nutr. 101: 45, 1971) for young men found by the same procedure." @default.
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- W1505484384 date "1973-08-01" @default.
- W1505484384 modified "2023-10-03" @default.
- W1505484384 title "Plasma Tryptophan Response Curve and Tryptophan Requirements of Elderly People" @default.
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- W1505484384 doi "https://doi.org/10.1093/jn/103.8.1220" @default.
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