• 제목/요약/키워드: recommended intake

검색결과 915건 처리시간 0.075초

A Concentration-Function Basis for Ideal Vitamin C Intake

  • Kwon, Oran;Levine, Mark
    • Nutritional Sciences
    • /
    • 제5권4호
    • /
    • pp.211-220
    • /
    • 2002
  • Vitamin C is an essential nutrient involved in many functions. Humans are unable to synthesize vitamin C de novo, because they lack the last enzyme in the biosynthetic pathway. Previous Recommended Dietary Allowances (RDAs) for vitamin C were based on prevention of deficiency with a margin of safety. However preventing deficiency may not be equivalent to ideal nutrient intake. Recommendation should be based on vitamin function in relation to concentration. For this goal, data set of the relationship between wide-range of vitamin C dose and resulting concentrations in plasma and tissues and characterization of functional outcomes in relation to these concentrations should be acquired. This article reviews the current knowledge in these areas and suggest how this knowledge may contribute toward establishing dietary guideline for ideal vitamin C intake.

Effects of the Intake Valve Timing and the Injection Timing for a Miller Cycle Engine

  • Han, Sung-Bin;Chang, Yong-Hoon;Choi, Gyeung-Ho;Chung, Yon-Jong;Poompipatpong, Chedthawut;Koetniyom, Saiprasit
    • 에너지공학
    • /
    • 제19권1호
    • /
    • pp.32-38
    • /
    • 2010
  • The objective of the research was to study the effects a Miller cycle. The engine was dedicated to natural gas usage by modifying pistons, fuel system and ignition systems. The engine was installed on a dynamometer and attached with various sensors and controllers. Intake valve timing, engine speed, load, injection timing and ignition timing are main parameters. Miller Cycle without supercharging can increase brake thermal efficiency 1.08% and reduce brake specific fuel consumption 4.58%. The injection timing must be synchronous with valve timing, speed and load to control the performances, emissions and knock margin. Throughout these tested speeds, original camshaft is recommended to obtain high volumetric efficiency.

A Concentration-function Basis for Ideal Vitamin C Intake

  • Kwon, Oran;Levine, Mark
    • 한국영양학회:학술대회논문집
    • /
    • 한국영양학회 2002년도 추계 심포지움초록
    • /
    • pp.1157-1168
    • /
    • 2002
  • Vitamin C is an essential nutrient involved in many functions. Humans are unable to synthesize vitamin C de novo, because they lack the last enzyme in the biosynthetic pathway. Previous Recommended Dietary Allowances (RDAs) for vitamin C were based on prevention of deficiency with a margin of safety. However preventing deficiency may not be equivalent to ideal nutrient intake. Recommendation should be based on vitamin function in relation to concentration. For this goal, data set of the relationship between wide-range of vitamin C dose and resulting concentrations in plasma and tissues and characterization of functional outcomes in relation to these concentrations should be acquired. This article reviews the current knowledge in these areas and suggest how this knowledge may contribute toward establishing dietary guideline for ideal vitamin C intake.

  • PDF

A Concentration-Function Basis for Ideal Vitamin C Intake

  • Kwon, Oran;Levin, Mark
    • 한국영양학회:학술대회논문집
    • /
    • 한국영양학회 2002년도 추계학술대회 및 총회
    • /
    • pp.54-70
    • /
    • 2002
  • Vitamin C is an essential nutrient involved in many functions. Humans are unable to synthesize vitamin C do novo, because they lack the last enzyme in the biosynthetic pathway. Previous Recommended Dietary Allowances (RDAs) for vitamin C were based on prevention of deficiency with a margin of safety. However preventing deficiency may not be equivalent to ideal nutrient intake. Recommendation should be based on vitamin function in relation to concentration. For this goal, data set of the relationship between wide-range of vitamin C dose and resulting concentrations in plasma and tissues and characterization of functional outcomes in relation to these concentrations should be acquired. This article reviews the current knowledge in these areas and suggest how this knowledge may contribute toward establishing dietary guideline for ideal vitamin C intake.

  • PDF

화력발전소 냉각 취수로내의 와류발생 방지를 위한 구조물의 적정조건검토 (Proper Conditions of Structure to Prevent Eddy Creation in Cooling Water Intake Canal of Stream Power Plant)

  • 조진훈;천만복
    • 한국농공학회:학술대회논문집
    • /
    • 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
    • /
    • pp.465-472
    • /
    • 1999
  • Hydraulic model tests are performed to find economical and hdrqulically stable design of cooling water intake channel of steam power plant. The result of tests show that the standard distributiion of y-components in the chamber of CWP(circulating Water Pump) are recommended below 3.5 to maintain hydraulic stability, so that this value is considered as the design criteria. Common basin is necessary to improve the hydraulic stability of inflow, however the longer basin does not always improve the hydraulic stability , and the optimal length of basin can be found in some range. From the results the flow stability maintained the best condition when the length of basin is 7.2m. Beside the standard tests the auxiliary tests like edge , baffle, trapezoidal section and increase of pump capacity are carried out based on the optimal condition foudn in the standard tests. From the series of tests the economical and hydraulically stable design of intake channel was proposed.

  • PDF

한국농촌주민(韓國農村住民)의 계절별(季節別) 식품섭취조사연구(食品攝取調査硏究) (A Study on Seasonal Variations of Food Consumption of Korean Farmers)

  • 박명윤
    • Journal of Nutrition and Health
    • /
    • 제9권1호
    • /
    • pp.43-50
    • /
    • 1976
  • This is the report of a food consumption survey of 193 members of 30 farm families in three rural villages of Korea. From a total of 188 households of the three villages, namely Wolgok in Kyunggi Do Province, Wachon in Kangwon Do Province, and Sobong in Cholla Namdo Province, 30 households were chosen for the survey. Four consecutive seasonal surveys, beginning in the autumn, November 1974 and finishing with the summer, August 1975, were made and each survey covered three consecutive days. The Precise Weighing Method was used in evaluating the kinds of food and nutrient intakes of the subjects. This method entails the accurate weighing of all foods by the investigator just prior to their consumption by the subjects under investigation. This survey was male to determine the actual food eaten by the members of these farm families at each season of the year, and to note any special differences in the foods consumed. The results obtained are summarized as follows: Food Intake The traditional ordinary diet of Korean farmers consists mainly of rice and other cereals as staple foods, and simple subsidary foods. The nutritional shortcomings of rice as a staple food are evident in the subclinical status of nutritional deficiencies. The mean consumption of cereals and their products was very high and it was more than half of the daily total food intake throughout all the seasons. The consumption of animal food, fruits, and fat by the farmers was very low. Fruit intake during winter and spring was almost nil. One of the special foods in the Korean dietary pattern is Kim-chi, a variety of pickled and fermented vegetables. The mean intake of Kim-chi during autumn and winter was very much higher than the other seasons. Korean farmers have difficulties in balanced year-round supply of food due to seasonality of food production and lack of food preservation. As nutrition problems of Korean farmers are highly influenced by seasonal variations, the expansion of an appropriate food preservation and storage programme should be encouraged. Special consideration should be given to new methods of preservation, the types of foods preserved, and production and consumption of nutritionally valuable foods for the improvement of the nutritional status in rural communities. Nutrient Intake Average adult rates for calorie and protein in the three study areas were 0.80 and 0.87 respectively, with little variations by villages. The adult caloric intake in averaged 2,928 kcal for autumn, 2,662 for winter, 2,673 for spring, and 2,760 for summer. Cereals contributed most of the total calories. In terms of the recommended daily dietary allowances for the Korean given by the Korea FAO Association, the diets in this survey were adequate except in the winter and spring. The protein intake averaged from 76.4 grams in autumn to 83.4 grams in summer and was near the recommended allowance, but a relatively large proportion of the total protein came from cereals and their products. The fat intake was unsatisfactory, ranging from 19.2 grams to 29.3 grams for the four seasons, and the consumption during farming season was higher than other seasons. It is apparent that the diet of the Korean farmers should be supplemented by calcium during autumn and winter. The highest calcium intake, with a mean of 583.5 milligrams, was recorded in summer. The mean intake of iron ranged from a low of 9.2 milligrams in the autumn to a high of 15.0 milligrams in the spring and it was satisfactory for all seasons. Among the vitamin group, the daily average intakes of vitamin A, thiamine, riboflavin, and ascorbic acid were lower than the desired intake throughout all the seasons. The mean vitamin A intake as ${\beta}-carotene$ ranged from a low of 2,807.8 IU to a high of 5,221.0 IU. The thiamine intake ranged from 0.98 milligrams to 1.19 milligrams, while mean riboflavin intake ranged from 0.92 milligrams to 1.13 milligrams. Ascorbic acid intake was 37.3 milligrams, the lowest, and the highest 47.8 milligrams. Niacin intake among Korean farmers was higher than the recommended allowance throughout all the seasons, and the mean intake ranged from 18.3 milligrams to 25.8 milligrams. The main character of the Korean farmers' diet has been found low in quality of protein and high in carbohydrate. Attention should be paid to the low intake of vitamin A, thiamine, riboflavin, and ascorbic acid among Korean farmers.

  • PDF

3일간의 자기 기입식 기록법을 적용한 대전지역 여고생의 액체수분 섭취실태 (Liquid Intake of Female High School Students by Self-Recording Method for 3-days in Daejeon)

  • 김영아;김영남
    • 한국가정과교육학회지
    • /
    • 제30권4호
    • /
    • pp.83-91
    • /
    • 2018
  • 본 연구는 대전시에 위치한 고등학교 1, 2학년 여학생 235명을 대상으로 자기 기입식 기록법을 적용하여 주중 2일과 주말 1일, 총 3일간의 액체수분 섭취실태를 조사하였다. 액체수분 섭취총량은 838.5 ㎖/일(주중 790.5 ㎖/일, 주말 934.5 ㎖/일)로 2015 한국인 영양소 섭취기준에 제시된 충분섭취량 900 ㎖/일에 미치지 못하였다. 액체수분의 종류별 섭취량 분석 결과, 물의 섭취량이 611.6 ㎖/일로 가장 많았고, 탄산음료(65.7 ㎖/일), 우유(41.6 ㎖/일), 과즙음료(32.8 ㎖/일), 과채주스(25.4 ㎖/일)의 순으로 나타났다. 나머지 음료 8종은 섭취량이 15 ㎖/일 미만이었다. BMI 비만도에 따른 액체수분 섭취량 차이 분석에서 물과 액체수분 섭취총량은 BMI 23.0 이상인 학생이 18.5 미만, 18.5 이상 23.0 미만인 학생보다 많았다. 운동 빈도와 고염식 식습관에 따른 섭취량 차이 분석에서 운동 일수 3일/주 이상, 고염식 식습관 점수 7점 이상인 학생은 탄산음료의 섭취량이 많았다. 건강한 사람이라면 수분의 과잉 섭취로 인한 유해 효과가 없기 때문에 충분한 수분 섭취, 특히 건강 음료의 선택과 관련하여 올바른 교육이 필요하다고 할 수 있다.

영양 관리 지원을 위한 Software system개발 (Software System Development for Supportinyg Nutritional Management)

  • 이혜숙
    • Journal of Nutrition and Health
    • /
    • 제22권4호
    • /
    • pp.290-299
    • /
    • 1989
  • 본 연구에서는 개인의 영양상태평가와 영양 상담을 효과적으로 실시하기 위하여 컴퓨터를 이용한 영양상태 평가 프로그램을 개발하였다. 이 연구결과 개인이 1일간 섭취한 식품으로 영양상태를 평가할 수 있으며 예상한 식품을 입력함으로써 간단한 식단작성이나 식단의 평가 자료로도 이용할수 있다. 또한 영양상담실에서는 영양상담시 개인의 영양상태를 올바로 빠른 시간내에 평가하여 영양교육자료로 이용가능하다. 더 나아가 동물실험이나 인체를 대상으로한 실험에서 실험식이를 작성하거나 평가할때도 이용될수 있다. 앞으로 이 자료에서 더 보강되어야 할 내용은 음식 recipe file에서 음식이 더 표준화되어야 하겠으며 더 다양한 종류가 입력되어야 한다.

  • PDF

EFFECT OF ENVIRONMENTAL TEMPERATURE AND FEED INTAKE ON PLASMA CONCENTRATION OF THYROID HORMONES IN DAIRY HEIFERS

  • Purwanto, B.P.;Fujita, M.;Nishibori, M.;Yamamoto, S.
    • Asian-Australasian Journal of Animal Sciences
    • /
    • 제4권3호
    • /
    • pp.293-298
    • /
    • 1991
  • A study was conducted to determine the effect of environmental temperature and level of food intake on plasma concentration of thyroid hormones. Three dairy heifers were used in an experiment which consisted of three levels of chamber temperature (10, 20 and $30^{\circ}C$) and three levels of food intake (100, 75 and 50% of recommended requirements). The analysis showed significant effects of environmental temperature on plasma triiodothyronine concentration, rectal temperature, respiration rate and heart rate but not on heat production. The range of plasma triiodothyronine was 2.51~1.79 ng/ml when the environmental temperature varied from 10 to $30^{\circ}C$. Effects of feed intake level were significant for heart rate and heal production. Heat production decreased from 25.9 to $20.0kJ/kg^{0.75}{\cdot}h$ when the TDN intake decreased from 66.3 to $35.1g/kg^{0.75}{\cdot}d$. There was no interactive effect of environmental temperature and feed intake level. Plasma triiodothyronine concentration decreased under high environmental temperature without any changes in heat production. The effects of environmental temperature and feed intake level on the physiological function of thyroid gland, as indicated by the relative circulating rate of thyroid hormones, were found to be clear.

Effect of plate size on meal energy intake in normal weight women

  • Ayaz, Aylin;Akyol, Asli;Cetin, Cansu;Besler, H. Tanju
    • Nutrition Research and Practice
    • /
    • 제10권5호
    • /
    • pp.524-529
    • /
    • 2016
  • BACKGROUND/OBJECTIVES: Use of smaller plates to control food intake is a commonly recommended strategy for restricting energy intake, despite conflicting results. Therefore, the aim of this study was to examine whether or not three different sizes of plates influence energy intake during a multi-itemed buffet meal in normal weight women. SUBJECTS/METHODS: This was a cross-over study conducted on 37 female participants aged 19-25 years with normal BMI levels. Participants were recruited from Hacettepe University and the surrounding community. On experimental days, participants ate a standard breakfast and were then randomly assigned to eat lunch using a small (19 cm), medium (23 cm), or large (28 cm) diameter plate. Visual analogue scale (VAS) scores on sensory and satiety outcomes were measured for all meals. Energy and macronutrient intakes during lunch were recorded. RESULTS: There was no evidence that use of a smaller plate size reduced energy or specific macronutrient intake during the free choice lunch meal. Multiple visits to the serving table were not associated with energy or macronutrient intake. Plate size did not affect VAS scores during the test days. CONCLUSIONS: Plate size did not influence energy intake, meal composition, or palatability in normal weight women during a multi-itemed open buffet lunch. Studies in natural settings at the population level are needed to clarify current outcomes.