Abstract:
:The pharmacokinetics of vitamin C following a 500 mg oral tablet dose were compared in a group of fourteen healthy young women whose age was 26.0 +/- 2.8 years (mean +/- s.d.), and in a group of fourteen healthy elderly women aged 68.1 +/- 2.6 years. The body composition of each subject was assessed using several anthropometric measurements in order to help explain any observed differences in the pharmacokinetic behavior of vitamin C. The vitamin C doses were characterized with the subjects in two states of vitamin C nutriture: a 'depleted' state which was achieved by 4-5 weeks on a vitamin C-restricted diet of less than 10 mg/d and a 'supplemented' state in which the subjects were given daily doses of 500 mg of vitamin C for 3 weeks. Plasma and urine samples were collected for 72 h following the dose of vitamin C from subjects in a 'depleted' state and for 24 h from subjects in a 'supplemented' state and analysed for their vitamin C content. None of the pharmacokinetic parameters measured differed significantly between the two age groups. In contrast, the vast majority of these parameters were significantly different in depleted and supplemented subjects. The peak times (tmax) were greater in the depleted state in both young and elderly groups whereas the peak concentrations (Cmax) were greater in the supplemented state. The absorption rate constant (Ka) was significantly larger in the supplemented state compared to the depleted state in the young group and the absorption half-life (t 1/2, Ka) was significantly greater in the depleted state in the young group only. The absorption lag time (tlag) did not differ with respect to age or nutritional status. The elimination half-life (t 1/2, Ke) was significantly longer in supplemented subjects. Although the apparent high volume of distribution (Vd) was not significantly different within each age group the Vd was significantly greater in the depleted state when the two age groups were combined. The clearance (CL), and the nonrenal clearance (CLNR) were significantly greater in the depleted state. The renal clearance (CLR) and the amounts of vitamin C excreted in the 0- to 12- and 12- to 24-h intervals were significantly larger in the supplemented state. The urinary excretion data also indicate that, in supplemented subjects, an average of about 40 percent of the administered dose is excreted as unchanged vitamin C in the first 12 h after dosing, with very little being excreted thereafter.
journal_name
Eur J Clin Nutrjournal_title
European journal of clinical nutritionauthors
Blanchard J,Conrad KA,Garry PJsubject
Has Abstractpub_date
1990-06-01 00:00:00pages
447-60issue
6eissn
0954-3007issn
1476-5640journal_volume
44pub_type
杂志文章abstract:OBJECTIVE:In term infants the relationship between visual acuity and dietary fatty acid composition is not consistent, possibly due to confounders, which were mostly neglected in the studies concerned. In the current study, therefore, the influence of the essential fatty acid status and potential confounders on the vis...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/sj.ejcn.1600868
更新日期:1999-11-01 00:00:00
abstract::Adverse reaction to cow's milk and infant formulas are common during infancy. Cow's milk has more than 20 constituents proteins and in principle many are capable of giving rise to an IgE mediated response. The prevalence of cow's milk allergy is between 0.5-10% of the paediatric population (Frier & Kletter, 1970, Gerr...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:
更新日期:1995-09-01 00:00:00
abstract:BACKGROUND/OBJECTIVES:Anthropometric measurement is a noninvasive and cost-efficient method for nutritional assessment. The study aims to present age- and gender-specific anthropometric reference data for Swedish elderly in relation to common medical conditions, and also formulate prediction equations for such anthropo...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/ejcn.2015.73
更新日期:2015-09-01 00:00:00
abstract:OBJECTIVE:To examine the relationship between selenium nutritional status and intermediates of human immunodeficiency virus (HIV)-1 transmission. DESIGN:Prospective cohort study. SETTING:A study clinic at Muhimbili National Hospital, Dar es Salaam, Tanzania. SUBJECTS:A total of 340 HIV-1-infected pregnant women with...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/sj.ejcn.1602567
更新日期:2007-04-01 00:00:00
abstract:OBJECTIVE:To study the short-term effect of resistant starch (RS) from retrograded high-amylose corn starch (HACS) on the excretion of bile acids and nutrients from the small bowel in humans. DESIGN:Seven healthy ileostomists were given a controlled, constant diet during three days. On days 2 and 3, 100 g/d of one of ...
journal_title:European journal of clinical nutrition
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1038/sj.ejcn.1600648
更新日期:1998-11-01 00:00:00
abstract::Impaired β-cell function and insufficient β-cell mass compensation are twin pathogenic features that underlie type 2 diabetes (T2D). Current therapeutic strategies continue to evolve to improve treatment outcomes in different ethnic populations and include approaches to counter insulin resistance and improve β-cell fu...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章,评审
doi:10.1038/ejcn.2017.13
更新日期:2017-07-01 00:00:00
abstract::Serum lipid levels are considered to be one of the main risk factors for cardiovascular diseases in middle-aged men and women. The significance, however, of serum lipid metabolism as a cardiovascular disease risk factor in the elderly has yet to be clarified. This paper focuses upon the serum lipid levels of groups of...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:
更新日期:1991-12-01 00:00:00
abstract:BACKGROUND/OBJECTIVES:It is not known if diets lower in greenhouse gas (GHG) emissions are also healthier. We evaluated the population health implications of changing to more sustainable diets in the UK, France, Finland, Italy and Sweden. SUBJECTS/METHODS:We developed a life table model to simulate mortality and morbi...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/s41430-019-0401-5
更新日期:2019-04-01 00:00:00
abstract:OBJECTIVES:To study the association between content in adipose tissue of very long-chain n-3 fatty acids, trans fatty acids, linoleic acid and alpha-linolenic acid and risk of a first myocardial infarction. DESIGN AND SUBJECTS:A case-control design among 100 patients and 98 population controls both men and postmenopau...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/sj.ejcn.1601064
更新日期:2000-08-01 00:00:00
abstract::Classification into month-specific cutpoints is used to minimize misclassification associated with single measurement of serum 25(OH)D. This study aims to evaluate this strategy, and to compare it with the widely used classification into overall cutpoints. For this purpose, we studied 69,553 subjects in whom serum 25(...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/ejcn.2012.69
更新日期:2012-09-01 00:00:00
abstract:BACKGROUND/OBJECTIVES:There is limited published research examining lipid-soluble vitamins in human immunodeficiency virus (HIV)-infected pregnant women, particularly in resource-limited settings. SUBJECTS/METHODS:This is an observational analysis of 1078 HIV-infected pregnant women enrolled in a trial of vitamin supp...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章,随机对照试验
doi:10.1038/ejcn.2010.76
更新日期:2010-08-01 00:00:00
abstract:BACKGROUND/OBJECTIVES:The objective of this study was to assess whether early menarche in normal-weight girls is associated with excess weight, abdominal obesity and metabolic changes at the end of sexual maturation. SUBJECTS/METHODS:This is a cohort study of 255 normal-weight girls aged 10-18 years attending public s...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/ejcn.2016.103
更新日期:2016-11-01 00:00:00
abstract:OBJECTIVES:To investigate the effect of three different food ingredients tyrosine, green tea extract (GTE) and caffeine on resting metabolic rate and haemodynamics, and on ad libitum energy intake (EI) and appetite. METHODS:Twelve healthy, normal weight men (age: 23.7 +/- 2.6 years, mean +/- s.d.) participated in a fo...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章,随机对照试验
doi:10.1038/sj.ejcn.1602901
更新日期:2009-01-01 00:00:00
abstract::Dietary intake data of 43 Finnish rheumatoid arthritis patients were collected using 7-day food records. The subjects were randomized into a control and a vegan diet groups, consisting of 22 and 21 subjects, respectively. The subjects in the vegan diet group received an uncooked vegan diet ('living food') for 3 months...
journal_title:European journal of clinical nutrition
pub_type: 临床试验,杂志文章,随机对照试验
doi:
更新日期:1993-10-01 00:00:00
abstract:OBJECTIVE:To evaluate dietary habits and nutritional status of Spanish school children and adolescents, and their relationship with the Mediterranean Diet. DESIGN:Cross-sectional study by face-to-face interview. SETTING:Free living children and adolescents of all Spanish regions. SUBJECTS:A random sample of 3166 peo...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/sj.ejcn.1601812
更新日期:2003-09-01 00:00:00
abstract:OBJECTIVE:To assess the relationship of energy stress during pregnancy and lactation to maternal body stores in marginally nourished rural Bangladeshi women. SUBJECTS AND METHODS:Two-hundred and fifty-two women were followed from 5-7 months of pregnancy until 6 months postpartum. Energy intake was estimated during pre...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/sj.ejcn.1601514
更新日期:2003-01-01 00:00:00
abstract:BACKGROUND:In view of the ongoing debate on "chronic malnutrition" and the concept of "stunting" as "a better measure than underweight of the cumulative effects of undernutrition and infection (WHO)", we translate, briefly comment and re-publish three seminal historic papers on catch-up growth following re-feeding afte...
journal_title:European journal of clinical nutrition
pub_type: 历史文章,杂志文章,评审
doi:10.1038/s41430-018-0274-z
更新日期:2018-12-01 00:00:00
abstract:OBJECTIVE:To assess whether consumption of 100 ml of whisky or red wine by healthy male subjects increased plasma total phenol content and antioxidant capacity. DESIGN:A Latin square arrangement to eliminate ordering effects whereby, after an overnight fast, nine volunteers consumed 100 ml of red wine, malt whisky or ...
journal_title:European journal of clinical nutrition
pub_type: 临床试验,杂志文章
doi:10.1038/sj.ejcn.1600635
更新日期:1998-10-01 00:00:00
abstract:OBJECTIVE:This study examined the prevalence of obesity and hypertension and associated behavioral risk factors in adult men and women in Uzbekistan. The study also examined the association between obesity and hypertension. METHOD:The analysis used data from the 2002 Uzbekistan Health Examination Survey, which include...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/sj.ejcn.1602465
更新日期:2006-12-01 00:00:00
abstract::More than 20 years of serological approach to diagnosis of celiac disease (CD) has deeply changed the classical clinical presentation of the disease, and some reports indicate that CD and obesity can coexist in both childhood and adolescence. We reviewed clinical records of 149 children with CD followed in our institu...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/ejcn.2010.161
更新日期:2010-11-01 00:00:00
abstract::Bone marrow transplantation is often associated with multiple organ failure which is usually reversible. Oral mucositis and dysphagia, vomiting, diarrhoea, protein losing enteropathy, transient exocrine pancreatic impairment, hypoalbuminaemia, biochemical trace element and mineral deficiencies are all common following...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章,评审
doi:10.1038/sj.ejcn.1600669
更新日期:1998-12-01 00:00:00
abstract:OBJECTIVE:Elevated hearing thresholds have been demonstrated in populations afflicted by endemic cretinism as a result of severe iodine deficiency. However, data on the effects of less severe iodine deficiency on hearing thresholds in apparently normal children are scant. This study addresses the question whether there...
journal_title:European journal of clinical nutrition
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1038/sj.ejcn.1601220
更新日期:2001-09-01 00:00:00
abstract:BACKGROUND/OBJECTIVES:Adult skeletal muscle mass (SMM) protects against type 2 diabetes, but little is known about its developmental antecedents. We examined whether pace of early weight gain predicted adult SMM in a birth cohort from Cebu City, Philippines. In addition, we examined whether increases in SMM associated ...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/ejcn.2015.18
更新日期:2015-12-01 00:00:00
abstract:OBJECTIVE:To determine whether the age-related decrease in resting energy expenditure (REE) is explained by variations in body composition. DESIGN:In Study 1, adult subjects (20-70 years) from the Quebec Family Study were classified into five different age groups. Body composition was measured by hydrodensitometry to ...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/sj.ejcn.1602262
更新日期:2006-01-01 00:00:00
abstract:OBJECTIVE:To study risk factors for and prevalence and validity of clinical-anthropometrical mismatch (CAM) defined as the presence of clinical signs of protein-energy malnutrition despite normal weight-for-age (WFA). DESIGN:A semi-longitudinal study of nutrition and morbidity with a longitudinal assessment of mortali...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:
更新日期:1994-01-01 00:00:00
abstract:BACKGROUND/OBJECTIVES:Health education and regulatory measures may contribute to lower population salt intake. Therefore, we aimed to describe knowledge and behaviors related to salt intake in Mozambique. SUBJECTS/METHODS:A cross-sectional evaluation of a representative sample of the population aged 15-64 years (n = 3...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/s41430-018-0125-y
更新日期:2018-12-01 00:00:00
abstract:OBJECTIVE:To examine the relationships between TNF-alpha, obesity, and insulin resistance among prepubescent children. DESIGN:Cross-sectional study. SETTING AND SUBJECTS:Data were collected from 112 nondiabetic Latino schoolchildren from public schools in three South Florida communities. Of the enrolled participants,...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/sj.ejcn.1601852
更新日期:2004-04-01 00:00:00
abstract::The relevance of nutritional indices derived from comparison with growth standards to assess the risk of dying was evaluated in a 2-year prospective study in rural Senegal. An average of 3151 children aged 6-59 months were measured twice a year and followed up during the intervening 6-month periods. Children who survi...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:
更新日期:1989-10-01 00:00:00
abstract:OBJECTIVE:The object of this study was to investigate the in vivo antioxidant effect of green tea and dosage effect of green tea on antioxidant effect. DESIGN:We tested 10 healthy subjects (aged 23-25 y, five women and five men) with overnight fasting. The total antioxidant capacity of plasma was measured at baseline ...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章
doi:10.1038/sj.ejcn.1600994
更新日期:2000-07-01 00:00:00
abstract:BACKGROUND/OBJECTIVES:Youth with type 1 diabetes (T1DM) are at substantially increased risk for adverse vascular outcomes, but little is known about the influence of dietary behavior on cardiovascular disease (CVD) risk profile. We aimed to identify dietary intake patterns associated with CVD risk factors and evaluate ...
journal_title:European journal of clinical nutrition
pub_type: 杂志文章,多中心研究
doi:10.1038/ejcn.2014.96
更新日期:2014-12-01 00:00:00