Daily Water Consumption and its Contribution to Calcium Intake in Korean Adults / 대한지역사회영양학회지

OBJECTIVES: Although water is essential for life and can supply essential minerals, studies that evaluate calcium intake through drinking water are limited. The aim of this study was to assess calcium contents of natural mineral water (NMW) and its possible contribution to calcium intake in healthy adults. METHODS: This study examined water consumption in 640 Korean adults with selfselected diet, analyzed the calcium content of 10 different brands of bottled NMWs sold in Korea, and assessed the amount of calcium intake from drinking water and its daily contribution to the recommended nutrient intake (RNI) of calcium. RESULTS: Mean calcium content in 10 bottled NMWs was 20.9 mg/l. Daily water intakes from food composition database and calculated using energy intake based on 0.53 ml/kcal were 957.2 ml and 1109.8 ml for men and 848.3 ml and 951.6 ml for women, respectively, with a significant difference by gender (p < 0.001). Daily drinking water intake was significantly higher among men than women (1203.9 ml vs. 1004.3 ml, respectively, p < 0.001). Daily calcium intakes from foods were 564.0 mg for men and 534.2 mg for women. Daily possible calcium intakes from drinking bottled water were 25.2 mg for men and 21.0 mg for women (p < 0.001). The contribution of daily calcium intake from drinking bottled water to RNI of calcium was 3.3% for men and 2.9% for women without significant difference. CONCLUSIONS: One half of the daily total water intake was consumed as drinking water, and possible calcium intake through drinking water was about 3% of RNI.

Daily Water Consumption and its Contribution to Calcium Intake in Korean Adults / 대한지역사회영양학회지

OBJECTIVES: Although water is essential for life and can supply essential minerals, studies that evaluate calcium intake through drinking water are limited. The aim of this study was to assess calcium contents of natural mineral water (NMW) and its possible contribution to calcium intake in healthy adults. METHODS: This study examined water consumption in 640 Korean adults with selfselected diet, analyzed the calcium content of 10 different brands of bottled NMWs sold in Korea, and assessed the amount of calcium intake from drinking water and its daily contribution to the recommended nutrient intake (RNI) of calcium. RESULTS: Mean calcium content in 10 bottled NMWs was 20.9 mg/l. Daily water intakes from food composition database and calculated using energy intake based on 0.53 ml/kcal were 957.2 ml and 1109.8 ml for men and 848.3 ml and 951.6 ml for women, respectively, with a significant difference by gender (p < 0.001). Daily drinking water intake was significantly higher among men than women (1203.9 ml vs. 1004.3 ml, respectively, p < 0.001). Daily calcium intakes from foods were 564.0 mg for men and 534.2 mg for women. Daily possible calcium intakes from drinking bottled water were 25.2 mg for men and 21.0 mg for women (p < 0.001). The contribution of daily calcium intake from drinking bottled water to RNI of calcium was 3.3% for men and 2.9% for women without significant difference. CONCLUSIONS: One half of the daily total water intake was consumed as drinking water, and possible calcium intake through drinking water was about 3% of RNI.

A survey on the nutritional status of vitamin A among urban residents / 预防医学

Objective To evaluate the nutritional status of vitamin A among urban residents. Methods Using stratified random sampling method,a total of 400 residents from two cities in Zhejiang were selected. They were interviewed by questionnaire,also, the dietary survey, physical measurement and blood sample testing were used. According to Recommended Nutrient Intake( RNI)of vitamin A,to evaluate the intake of Vitamin A and analysis the nutritional status and influenc factors. Results The median of vitamin A concentration was 0. 463( inter-quartile range is 0. 213)μg/mL, and the percentage of severe vitamin A deficiency( VAD ),VAD,insufficiency and adequate serum vitamin A were 0. 25%,0. 50%,6. 75% and 92. 50% respectively. Among 299 individuals who participated in the dietary survey,the median of daily vitamin A intake was 350. 5( inter-quartile range was 351. 5)μgRE. Only 25. 42% of participants' dietary intake of vitamin A met the level of 80% RNI,while 61. 87% of peoples' daily intake of vitamin A under 60%RNI. Male, from the bigger city,older age,high level of triglyceride and more intake of cholesterol may contribute to a higher level of serum vitamin A. Conclusion The majority of urban residents had adequate vitamin A . But the intake of dietary vitamin A still should be paid more attention. Serum vitamin A was associated with age,gender and district.

Protein requirements in healthy adults: a meta-analysis of nitrogen balance studies / 生物医学与环境科学（英文）

<p><b>OBJECTIVE</b>The goal of this study was to analyze protein requirements in healthy adults through a meta-analysis of nitrogen balance studies.</p><p><b>METHODS</b>A comprehensive search for nitrogen balance studies of healthy adults published up to October 2012 was performed, each study were reviewed, and data were abstracted. The studies were first evaluated for heterogeneity. The average protein requirements were analyzed by using the individual data of each included studies. Study site climate, age, sex, and dietary protein source were compared.</p><p><b>RESULTS</b>Data for 348 subjects were gathered from 28 nitrogen balance studies. The natural logarithm of requirement for 348 individuals had a normal distribution with a mean of 4.66. The estimated average requirement was the exponentiation of the mean of the log requirement, 105.64 mg N/kg•d. No significant differences between adult age, source of dietary protein were observed. But there was significant difference between sex and the climate of the study site (P<0.05).</p><p><b>CONCLUSION</b>The estimated average requirement and recommended nutrient intake of the healthy adult population was 105.64 mg N/kg•d (0.66 g high quality protein/kg•d) and 132.05 mg N/kg•d (0.83 g high quality protein/kg•d), respectively.</p>

Recommended Nutrient Intake for Dietary Fibre: Bar Set Too High for Malaysians?

This article presents findings from three separate data sets on food consumption in apparently healthy Malaysian adult males and females aged 22-60 years, and secondary data extracted from the Malaysian Adult Nutrition Survey (MANS) 2003. Assessment of food intake by 24-hour recall or the food diary method and use of the nutrient calculator- DietPLUS- to quantify intake of macronutrients and dietary fibre (DF) in the primary data, revealed low mean DF intakes of 10.7±1.0 g/day (Course participants, n=52), 15.6 ±1.2 (University sample, n=103), and 16.1 ±6.1 (Research Institute staff, n=25). An alarmingly high proportion of subjects (75 to 95%) in these three data sets did not meet the national population intake goal of 20-30 g DF/day. A list of 39 food items which contain fibre, extracted from the MANS 2003 report as being average amounts consumed daily by each Malaysian adult, provided 19.2 g DF which meant that >50% of Malaysian adults consumed less than the recommended DF intake of 20-30 g/day. This large deficit of actual intake versus recommended intakes is not new and is also observed in developed western nations. What is of great concern is that the preliminary findings presented in this article indicate that the national population goal of 20-30 g DF/day may be beyond the habitual diets of the majority of Malaysians. Appropriately, the authors propose the inclusion of a daily minimum requirement for DF intake in the Malaysian Dietary Guidelines, which would somewhat mimic the Malaysian Dietary Guidelines 1999 for dietary fat, as well as the stand taken by the Scientific Advisory Committee on Nutrition (SACN) of the United Kingdom. This minimum requirement, if agreed to, should not be higher than the 16 g DF or so provided by the hypothetical ‘high-fibre’ healthy diet exemplified in this article.

Urgent need to increase current dietary reference intakes of vitamin D / 中华临床营养杂志

level and recommended nutrient intake)in China has been out-of-date.Therefore,it has became an urgent problem for Chinese Nutrition Society to re-evaluate the DRIs of vitamin D and make corresponding modifications.