Obligatory N loss and utilization of egg and rice mixed protein in young Japanese women.

Kaneko, Kayoko; Koike, Goro

doi:10.3177/jnsv.29.455

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…A previous study (7) in our laboratory on obligatory urinary and fecal N losses of Japanese female subjects showed that urinary loss was similar but fecal loss was lower compared with those of male subjects. In this work we estimated utilization and requirement of egg protein in Japanese female subjects at two levels of energy intake.…”

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Utilization and requirement of egg protein in Japanese women.

Kaneko

Koike

1985

Journal of Nutritional Science and Vitaminology, J Nutr Sci Vit

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SummaryUtilization and requirement of egg protein in Japanese women with two levels of energy intake were estimated. In experiment 1, fifteen female students were given semi-purified diet containing whole egg as the sole nitrogen source for 12 days. Nitrogen intakes were 50 for five, 75 for two and 100mg N/kg for eight subjects. Habitual energy intake was determined individually by detailed inquiry about the foods consumed before the experiment was started. Mean energy intake was 33 kcal/kg. In experiment 2, eighteen other subjects were given the same diet containing four intake levels of egg protein (30, 50, 75, 100mg N/kg) with an energy intake of about 100 kcal/day added to that calculated by the food intake inquiry. The mean energy intake was 37 kcal/kg. The total nitrogen contents of the experimental diet, urine and feces were analyzed and the nitrogen balance was estimated from these figures. Significant rectilinear relations were found between nitrogen intake (X, mg N/kg) and balance (Y, mg N/kg). The regression equations were; Experiment 1: Y=0.256X-34.4 (n=15, r=0.742) Experiment 2: Y=0.326X-29.7 (n=18, r=0.645) The maintenance intakes of whole egg protein for apparent nitrogen equilibrium were calculated to be 134 and 91mg N/kg with energy intakes of 33 and 37 kcal/kg, respectively. Net protein utilization (NPU) and digestibility of egg protein were calculated using the obligatory N losses previously determined in Japanese women. The NPUs at the maintenance level of egg protein with energy intakes of 33 and 37 kcal/kg were estimated as 31 and 47, respectively. The mean digestibility of egg protein was 96%. Key Words protein utilization, protein requirement, egg protein, wo men, energy intakeThe present protein allowance suggested by the FAO/WHO (1) and the Committee on Nutrition (Japan) (2) is based on the amount of dietary protein needed to maintain the nitrogen (N) balance in healthy male adults in laboratory

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confidence: 74%

Utilization and requirement of egg protein in Japanese women.

Kaneko

Koike

1985

Journal of Nutritional Science and Vitaminology, J Nutr Sci Vit

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“…Some factors, such as energy intake level, are known to influence the excretion of nitrogen into urine or feces and consequently the NPU figure. We also observed a relatively larger variation of urinary nitrogen excretion in female than in male subjects fed low-protein diets (5,8). We presume that there might be a variation in nitrogen metabolism in response to the change in energy metabolism in female subjects fed a low-protein diet.…”

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confidence: 52%

“…This figure is almost as same as the mean requirement of high-quality proteins employed in Recommended Dietary Allowances for Japanese (1). The NPU of the proteins at the nitrogen intake level to maintain accurate nitrogen equilibrium was calculated as 48 by using the data of fecal nitrogen excretion at the nitrogen intake for equilibrium obtained in the present experiment and obligatory urinary and fecal nitrogen excretions reported previously (5).…”

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confidence: 99%

Utilization and requirement of dietary protein taking into account the dermal and miscellaneous nitrogen losses in Japanese women.

Kaneko

Ishikawa

Setoguchi

et al. 1988

Journal of Nutritional Science and Vitaminology, J Nutr Sci Vit

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“…Additionally, the women were given cornstarch, sugar alfd shortening oil (50 g for subject A and 45 g for subjects B, C, D and E) to supply their energy requirements of 1800 kcal per day for subject A and 1600kcal per day for subjects B, C, D and E. The diets also included two tablets of vitamin mixture and 4g of mineral mixture. 2 ) The subjects were weighed daily before breakfast after voiding urine. No appreciable changes in the body weight were observed during 12 days (the final body weights of the subjects were 53.9kg (A), 48.8kg (B), 47.4kg (c), 46.ikg (D) and 53.4kg (E».…”

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confidence: 99%