Abstract:
BACKGROUND:Calcium absorption is generally considered to be impaired under conditions of vitamin D deficiency, but the vitamin D status that fully normalizes absorption is not known for humans. OBJECTIVE:To quantify calcium absorption at two levels of vitamin D repletion, using pharmacokinetic methods and commercially marketed calcium supplements. DESIGN:Two experiments performed in the spring of the year, one year apart. In the first, in which participants were pretreated with 25-hydroxyvitamin D (25OHD), mean serum 25OHD concentration was 86.5 nmol/L; and in the other, with no pretreatment, mean serum concentration was 50.2 nmol/L. Participants received 500 mg oral calcium loads as a part of a standard low calcium breakfast. A low calcium lunch was provided at mid-day. Blood was obtained fasting and at frequent intervals for 10 to 12 hours thereafter. METHODS:Relative calcium absorption at the two 25OHD concentrations was estimated from the area under the curve (AUC) for the load-induced increment in serum total calcium. RESULTS:AUC(9) (+/- SEM), was 3.63 mg hr/dL +/- 0.234 in participants pretreated with 25OHD and 2.20 +/- 0.240 in those not pretreated (P < 0.001). In brief, absorption was 65% higher at serum 25OHD levels averaging 86.5 nmol/L than at levels averaging 50 nmol/L (both values within the nominal reference range for this analyte). CONCLUSIONS:Despite the fact that the mean serum 25OHD level in the experiment without supplementation was within the current reference ranges, calcium absorptive performance at 50 nmol/L was significantly reduced relative to that at a mean 25OHD level of 86 nmol/L. Thus, individuals with serum 25-hydroxyvitamin D levels at the low end of the current reference ranges may not be getting the full benefit from their calcium intake. We conclude that the lower end of the current reference range is set too low.
journal_name
J Am Coll Nutrjournal_title
Journal of the American College of Nutritionauthors
Heaney RP,Dowell MS,Hale CA,Bendich Adoi
10.1080/07315724.2003.10719287subject
Has Abstractpub_date
2003-04-01 00:00:00pages
142-6issue
2eissn
0731-5724issn
1541-1087journal_volume
22pub_type
临床试验,杂志文章,随机对照试验abstract::The glycemic index (GI) is a physiological assessment of a food's carbohydrate content through its effect on postprandial blood glucose concentrations. Evidence from trials and observational studies suggests that this physiological classification may have relevance to those chronic Western diseases associated with ove...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章,评审
doi:10.1080/07315724.2009.10718109
更新日期:2009-08-01 00:00:00
abstract::Dietary intake surveys of rural and urban communities in three Pacific Island countries were conducted using an adjusted 24-hour dietary recall method. Dietary survey samples were drawn from noncommunicable disease surveys of Melanesians and Indians in Fiji, Micronesians in Kiribati and Melanesians in Vanuatu. Compari...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.1992.10718229
更新日期:1992-06-01 00:00:00
abstract:BACKGROUND:Psyllium and oat bran have been shown to lower plasma LDL cholesterol levels in different populations. Hypercholesterolemia is prevalent in the Northern part of Mexico and might be associated to dietary habits and sedentary lifestyle. METHODS:Sedentary normal (cholesterol<200 mg/dL) (n=36) and hypercholeste...
journal_title:Journal of the American College of Nutrition
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1080/07315724.1998.10718809
更新日期:1998-12-01 00:00:00
abstract::Epidemiological studies indicate a strong relationship between dietary Mg intake and the incidence of sudden cardiac death. The mechanism by which dietary Mg leads to an increased incidence of cardiovascular disease is unknown but may involve alteration of electrolyte balance. In the present study, tissue electrolyte ...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.1985.10720074
更新日期:1985-01-01 00:00:00
abstract:BACKGROUND:The objective of this study was to identify an association among dietary components, iron, and inflammatory status among adolescent girls. METHOD:Dietary information for 85 adolescent girls was collected through food frequency questionnaires. Biomarkers of iron and inflammatory status were analyzed. RESULT...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.2018.1492470
更新日期:2019-03-01 00:00:00
abstract:OBJECTIVES:To examine if and how ready-to-eat cereals (RTEC) contribute to the quality of the diet of children, adolescents and young adults in a Mediterranean setting. METHODS:A random sample of 3534 subjects aged 2 to 24 years in Spain was studied. Food and nutrient intakes were determined by a 24 hour recall. RTEC ...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.2006.10719524
更新日期:2006-04-01 00:00:00
abstract:OBJECTIVES:Relating food diversity, quality, and intake is one of the key aspects in understanding household food security. This paper aimed at marying food intake and quality, both being measurement for food security. METHODS:A household food consumption survey (n=200) exploring food diversity, quality of foods, and ...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.2013.797859
更新日期:2013-01-01 00:00:00
abstract::Anorexia nervosa (AN) can result in extreme malnutrition, and these patients frequently require inordinately large amounts of calories to gain weight during refeeding therapy. Insulin-like growth factor-I (IGF-I) is a polypeptide that mediates many of the anabolic effects of growth hormone. Low levels of IGF-I have be...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.1993.10718338
更新日期:1993-08-01 00:00:00
abstract::Exogenous, microbial beta-D-galactosidases are capable of effecting hydrolysis of lactose in situ in the gastrointestinal tract of lactase-deficient subjects when given as replacement therapy at mealtime. As its digestion products-glucose and galactose-are known to inhibit lactose hydrolysis in vitro, the effect of ad...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.1986.10720131
更新日期:1986-01-01 00:00:00
abstract:OBJECTIVE:Magnesium (Mg) deficiency has been shown to increase substance P release and induce a pro-inflammatory response that can be attenuated with the administration of a substance P-antagonist. Neurogenic inflammation has also been implicated in traumatic brain injury (TBI), a condition where brain intracellular fr...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.2004.10719398
更新日期:2004-10-01 00:00:00
abstract:OBJECTIVE:The kinetics of magnesium (Mg) absorption, after drinking Magnesia mineral water (204 mg Mg/L), was investigated in healthy humans aged (23-60 yrs). METHODS:Serum Mg, calcium (Ca), potassium (K) and sodium (Na) content, blood hemoglobin, erythrocyte and white blood cell counts as well as urinary volume and u...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.2004.10719424
更新日期:2004-12-01 00:00:00
abstract:OBJECTIVES:To measure bone mineral density (BMD) and to screen for early biochemical abnormalities in bone mineral metabolism in the first five years of natural menopause when estrogen and calcium supplement are not used and in the absence of major confounding variables. SETTING:Two homogeneous and comparable groups (...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.2005.10719485
更新日期:2005-10-01 00:00:00
abstract::Coronary heart disease (CHD) is the leading cause of death in most developed nations and is rapidly increasing in prevalence in developing countries. Death rates from cardiovascular disease exceed 1 million annually in the United States and account for the largest disease-related cost to health with total costs estima...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章,meta分析
doi:10.1080/07315724.2000.10718963
更新日期:2000-06-01 00:00:00
abstract:OBJECTIVE:The objective of this study is to examine various factors associated with total calcium intake and percent adequate intake (% AI) of calcium by children and adolescents, with respect to age, gender, race/ethnicity, and diet and beverage choices. DESIGN:Data from the U.S. Department of Agriculture's Continuin...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.2004.10719339
更新日期:2004-02-01 00:00:00
abstract:OBJECTIVE:The goal of this work is to assess the effect of L-carnitine on glucose disposal, particularly on insulin sensitivity, in healthy volunteers. METHODS:Fourteen healthy human volunteers were subjected to the intravenous glucose tolerance test (analyzed by means of the minimal model technique), together with in...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.1999.10718866
更新日期:1999-08-01 00:00:00
abstract:OBJECTIVE:To determine measured resting energy expenditure (REE) of nonambulatory tube-fed patients with severe neurological neurodevelopmental disabilities. METHODS:Twenty patients were prospectively studied. Only steady state indirect calorimetry measurements were taken. All measurements were conducted using a canop...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.1999.10718828
更新日期:1999-02-01 00:00:00
abstract:BACKGROUND:While not life threatening, muscle cramps severely affect the quality of life of patients with cirrhosis. AIM:To determine whether oral zinc sulfate therapy decreases the frequency and severity of muscle cramps in cirrhotic patients. METHODS:12 patients with cirrhosis (5 Child's A, 3 Child's B, and 4 Child...
journal_title:Journal of the American College of Nutrition
pub_type: 临床试验,杂志文章
doi:10.1080/07315724.2000.10718908
更新日期:2000-02-01 00:00:00
abstract:OBJECTIVE:The salt (NaCl) content of bread, obtained from Belgium and 25 other regions or countries worldwide, was analyzed to evaluate the importance of bread as a source of dietary salt in a population. METHODS:A total of 1166 dried bread samples were analyzed using a hot HCl extraction technique followed by flame p...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.1994.10718392
更新日期:1994-04-01 00:00:00
abstract:OBJECTIVE:The aim of this study was to assess the effects of 3-day Islamic intermittent fasting (3d-IF) on cognitive performance and serum levels of neurotrophic factors (brain-derived neurotrophic factor [BDNF] and vascular endothelial growth factor [VEGF]) before and after repeated sprints. METHODS:Twenty-one physic...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章,随机对照试验
doi:10.1080/07315724.2016.1256795
更新日期:2017-03-01 00:00:00
abstract::The inverse relationship between intake of dairy products and blood pressure levels was first suggested by several epidemiologic surveys in the early 1980's that revealed low calcium intake in populations with increased prevalence of hypertension. Subsequent laboratory and clinical investigations provided further evid...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章,评审
doi:10.1080/07315724.2000.10718085
更新日期:2000-04-01 00:00:00
abstract::This paper describes relationships between reported alcohol consumption and selected sociodemographic and health variables. Two hundred and four men and 367 women aged 60-95 years were examined as part of a nutritional status survey of elderly. Fifty-three percent of men and 44% of women reported drinking at least 2 g...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.1990.10720388
更新日期:1990-08-01 00:00:00
abstract::The acquisition and maintenance of bone mass and strength are influenced by environmental factors, including physical activity and nutrition. Among micronutrients, calcium (Ca) and inorganic (i) phosphate (P) are the two main constituents of hydroxyapatite, the bone mineral that strengthens the mechanical resistance o...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章,评审
doi:10.1080/07315724.2011.10719988
更新日期:2011-10-01 00:00:00
abstract:BACKGROUND:Postprandial hyperglycemia has been associated with increased oxidative stress and the development of diabetes, heart disease and all-cause mortality. OBJECTIVE:To assess the effect of novel maize-based dietary fibers on postprandial glycemia and to assess the correlation between a rapid in vitro digestibil...
journal_title:Journal of the American College of Nutrition
pub_type: 临床试验,杂志文章
doi:10.1080/07315724.2008.10719748
更新日期:2008-12-01 00:00:00
abstract::The tenth anniversary for the determination of magnesium in MBC shows progress, but fundamental questions are still unanswered. Uniformity of the methodology for the assay and the units for reporting the result is a key factor for the validity and comparability of results. There is relatively good agreement among inve...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.1987.10720166
更新日期:1987-04-01 00:00:00
abstract:OBJECTIVE:The following review of the literature on the importance of Selenium (Se) in myocardial homeostasis and of the pharmacology of this trace metal, represents an attempt to search, without prejudice to other possible explanations, for a rationale of a beneficial effect of Se substitution as an adjuvant to antiar...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章,评审
doi:10.1080/07315724.1994.10718441
更新日期:1994-10-01 00:00:00
abstract::The effects of adding increasing concentrations of magnesium (Mg), zinc (Zn), and iron (Fe) on calcium (Ca) uptake into rat brush border membrane vesicles was measured. At ratios of 1:1, based on the RDA, none of these minerals were found to significantly decrease calcium uptake. Mg, however, inhibited Ca uptake at an...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.1991.10718125
更新日期:1991-02-01 00:00:00
abstract::Failure to thrive (FTT) has been defined in a number of ways, but most definitions include a weight less than the 5th percentile on the growth chart or a decreasing rate of weight gain. Nonorganic failure to thrive (NOFTT), i.e., FTT not due to organic disease, is the most common category of FTT in the United States a...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章,评审
doi:10.1080/07315724.1988.10720251
更新日期:1988-10-01 00:00:00
abstract:OBJECTIVE:Vegetarians may be at risk of certain nutrient deficiencies, particularly vitamin B-12. Vitamin B-12 deficiency may increase plasma homocysteine concentration and thus may potentially increase the risk of cardiovascular disease in vegetarians. The purpose of this study was to assess and compare plasma homocys...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.2010.10719811
更新日期:2010-02-01 00:00:00
abstract:BACKGROUND:Patients with systemic lupus erythematosus (SLE) have elevated cardiovascular risk. Hyperhomocysteinemia may be one of the contributing factors to this phenomenon. This study therefore aimed to compare the serum homocysteine levels and the levels of folate and vitamin B12, cofactors for homocysteine metaboli...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.2020.1788472
更新日期:2020-07-23 00:00:00
abstract:BACKGROUND:Intakes of ready-to-eat cereal (RTEC) have been inversely associated with risk factors of chronic diseases such as cardiovascular disease (CVD), type 2 diabetes, and certain cancers; however, their relations with total and cause-specific mortality remain unclear. OBJECTIVE:To prospectively assess the associ...
journal_title:Journal of the American College of Nutrition
pub_type: 杂志文章
doi:10.1080/07315724.2014.971193
更新日期:2016-01-01 00:00:00