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Intake Levels (intake + level)
Selected AbstractsChallenges in Using the Dietary Reference Intakes to Plan Diets for GroupsNUTRITION REVIEWS, Issue 8 2005Suzanne P. Murphy PhD A recent report describes a new paradigm for planning the dietary intakes of groups, the goals of which are to achieve low prevalences of both inadequate and excessive intakes. However, there are many challenges involved in properly implementing these methods, and pilot studies are urgently needed. For individuals, the target for nutrient intakes is usually the Recommended Dietary Allowance (RDA); for nutrients without an RDA, the Adequate Intake (AI) can be used. Intakes should be planned so they do not exceed the Tolerable Upper Intake Level (UL). Several applications illustrating how to use the DRIs for planning the diets of individuals have been published, so this review will focus primarily on the methods that are recommended for planning the diets of groups. [source] Effect of flow parameters of rumen digesta on effective degradability and microbial yield in sheepANIMAL SCIENCE JOURNAL, Issue 4 2009Toshiyoshi ICHINOHE ABSTRACT The aim of this experiment was to examine the effect of rumen digesta flow parameters on effective degradability (EDG) and microbial nitrogen (MBN) yield in sheep fed diets of identical provision of both metabolizable energy and rumen degradable nitrogen (RDN). Ruminal degradation parameters of early-harvested perennial ryegrass hay (EH), late-harvested perennial ryegrasses hay (LH) and winter sown barley straw (BS) were determined by a nylon bag technique. Subsequently, three experimental diets (EHD, LHD and BSD) were formulated using the tested forages, sucrose and urea as supplements. An in vivo feeding study was conducted using four rumen cannulated sheep in a partial Latin square design. Digestibility, rate constants of rumen particle breakdown and passage, ruminal fermentation parameters and MBN supply to the small intestine were determined. Animals thoroughly consumed the forages fed at a restricted level. Digestion coefficients were greater for EHD than for LHD and were lowest for BSD (P < 0.05). The rate constant of large particle breakdown was 4.3, 5.9 and 6.7 %/h, respectively, and small particle passage was 5.3, 4.7 and 6.3 %/h for EHD, LHD and BSD, respectively. The estimates differed (P < 0.05) between the diets. The overall passage rate constant of total rumen particles was estimated to be higher for BSD than that for EHD or LHD (P < 0.05). Ruminal fermentation parameters were unaffected by dietary treatments (P > 0.05). Intake levels of rumen degradable organic matter (RDOM) and RDN were estimated to be greater for LHD than that for EHD or BSD (P < 0.05). Although dietary arrangements were made to give identical microbial efficiency, the estimated value was higher for EHD than that for LHD or BSD (P < 0.05); and the MBN yield for BSD was estimated to be lower than that for EHD or LHD (P < 0.05). Rumen kinetic parameters of degradation and particle flow of forage affected EDG values and MBN yield from forage-related RDN intake, although those had little effect on the efficiency of MBN yield from forage-related RDOM intake. [source] Trans fatty acids and cancers: AFSSA recommendationsEUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY, Issue 9 2007Mariette Gerber Abstract The results of epidemiological studies were too few and inconsistent to enable a conclusion to be drawn as to whether dietary trans fatty acids (TFA) including conjugated linoleic acids (CLA) were beneficial or detrimental to the various sites of cancer studied. The effect of CLA isomers has only been studied in animal models, and mainly on mammary tumours. CLA , particularly the 9c,11t CLA , exerted an inhibitory effect on the initiation and development of these tumours, whereas a similar effect has not been observed in humans, whose intake level is much lower than the threshold required for an antitumour effect to be detectable in rodents. The aforementioned effect has been obtained in animal models at prolonged and high intakes, from 0.5 to 2% of the total energy intake, which corresponds approximately to 5,10,g/day in humans. The underlying mechanisms have not been identified and are probably indirect and multiple. [source] Comparison of nutrient intake between different dietary assessment methods in elderly male volunteersNUTRITION & DIETETICS, Issue 4 2008Gunnar JOHANSSON Abstract Aim:, The objective of the study was to compare nutritional intake results obtained from the 4 × 4-day weighed records with those obtained from a food frequency questionnaire, repeated 24-hour recalls, a seven-day food record and a seven-day checklist in elderly men. Methods:, Seventy-five healthy men aged 55,88 years and living at home in Cambridge, UK, took part in the study. Energy and nutrients had means and standard deviations calculated. Misreporting was based on an evaluation of food intake level, calculated as reported energy intake divided by predicted basal metabolic rate. This was in relation to a plausible physical activity level, calculated as the ratio of energy expenditure divided by predicted basal metabolic rate. Statistical significance was assessed via one-way anova. Results:, The nutrient density was higher for protein and potassium for the group with low food intake level values in all dietary assessment methods. For some methods, this was also true for calcium, carotene, iron and vitamin C. All methods yielded similar results. Conclusions:, The present study indicates that selective underreporting exists. Surprisingly, the simplest method, the simplified 24-hour recall, performed as well as more complicated methods. [source] Reduced water oxygen levels affect maximal feed intake, but not protein or energy utilization efficiency of rainbow trout (Oncorhynchus mykiss)AQUACULTURE NUTRITION, Issue 1 2009B.D. GLENCROSS Abstract This study examined the effect of reduced water oxygen levels on the utilization efficiencies of energy and protein from a diet fed to rainbow trout. An experimental diet was fed at one of the four ration levels with an additional starved treatment also included in each oxygenation regime. Oxygen levels in each oxygenation regime varied with ration level, but averaged 9.3 ± 0.36 mg L,1 for the normal regime and 5.7 ± 1.4 mg L,1 for the hypoxia regime. Significant differences were observed in the apparent satietal feed intake levels in each oxygenation regime, but not at any of the pair-fed restricted levels. No significant effects of oxygenation regime were observed on the utilization of either energy or protein by the fish. Efficiency of protein use varied depending on the protein intake level, but was not significantly affected by oxygenation regime. This study demonstrates that a reduction in the oxygen levels of the water does not affect the utilization efficiency of dietary digestible protein and energy in rainbow trout, but does result in a downregulation of feed intake when the fish is fed to apparent satietal levels. [source] The integration of digestion and osmoregulation in the avian gutBIOLOGICAL REVIEWS, Issue 4 2009Todd J. McWhorter Abstract We review digestion and osmoregulation in the avian gut, with an emphasis on the ways these different functions might interact to support or constrain each other and the ways they support the functioning of the whole animal in its natural environment. Differences between birds and other vertebrates are highlighted because these differences may make birds excellent models for study and may suggest interesting directions for future research. At a given body size birds, compared with mammals, tend to eat more food but have less small intestine and retain food in their gastrointestinal tract (GIT) for shorter periods of time, despite generally higher mass-specific energy demands. On most foods, however, they are not less efficient at digestion, which begs the question how they compensate. Intestinal tissue-specific rates of enzymatic breakdown of substrates and rates of active transport do not appear higher in birds than in mammals, nor is there a demonstrated difference in the extent to which those rates can be modulated during acclimation to different feeding regimes (e.g. diet, relative intake level). One compensation appears to be more extensive reliance on passive nutrient absorption by the paracellular pathway, because the avian species studied so far exceed the mammalian species by a factor of at least two- to threefold in this regard. Undigested residues reach the hindgut, but there is little evidence that most wild birds recover microbial metabolites of nutritional significance (essential amino acids and vitamins) by re-ingestion of faeces, in contrast to many hindgut fermenting mammals and possibly poultry. In birds, there is some evidence for hindgut capacity to breakdown either microbial protein or protein that escapes the small intestine intact, freeing up essential amino acids, and there is considerable evidence for an amino acid absorptive capacity in the hindgut of both avian and mammalian hindgut fermenters. Birds, unlike mammals, do not excrete hyperosmotic urine (i.e. more than five times plasma osmotic concentration). Urine is mixed with digesta rather than directly eliminated, and so the avian gut plays a relatively more important role in water and salt regulation than in mammals. Responses to dehydration and high- and low-salt loads are reviewed. Intestinal absorption of ingested water is modulated to help achieve water balance in one species studied (a nectar-feeding sunbird), the first demonstration of this in any terrestrial vertebrate. In many wild avian species the size and digestive capacity of the GIT is increased or decreased by as much as 50% in response to nutritional challenges such as hyperphagia, food restriction or fasting. The coincident impacts of these changes on osmoregulatory or immune function of the gut are poorly understood. [source] Nodularin uptake by seafood during a cyanobacterial bloomENVIRONMENTAL TOXICOLOGY, Issue 6 2001P. G. Van Buynder Abstract The problem of blue-green algal toxin contamination of recreational waters and drinking water catchments is well described, as is the potential contamination of associated seafood. Algal contamination of Victorian waterways is now a widespread annual occurrence and, in some regions, the intersection of blooms and commercial fishing threatens the food safety of large numbers of people. Toxin levels which produce no observed adverse effect in animal studies were used to derive safe tolerable daily intake levels. These ,acceptable levels' were then modified to protect against potential acute health risks associated with short-term exposures. National food surveys were used to derive likely seafood intakes and thus, in combination with ,safe toxin levels', health alert levels for seafood were formulated. During the summer of 2001 a bloom of Nodularia spumigena occurred in the Gippsland Lakes area of Southern Victoria. During the bloom, seafood samples were collected and nodularin concentrations were estimated. Nodularin concentrations reached levels of concern in mussels and in prawn viscera at cell counts as low as 30,000 cells/ml. Nodularin concentrations in the flesh of finfish remained low. Boiling the seafood redistributed toxin between viscera and flesh. The results were used to restrict some seafood harvesting. © 2001 John Wiley & Sons, Inc. Environ Toxicol 16: 468,471, 2001 [source] Family functioning at meals relates to adherence in young children with type 1 diabetesJOURNAL OF PAEDIATRICS AND CHILD HEALTH, Issue 12 2009Susana R Patton Aims: This study examined associations between mealtime family functioning, dietary adherence and glycaemic control in young children with type 1 diabetes mellitus (T1DM). We hypothesised that poorer family functioning would correlate with poorer dietary adherence and glycaemic control. Methods: Thirty-five families of children (M = 5.6 ± 1.5 years) with T1DM had meals videotaped in their home, which were coded for family functioning according to the McMaster Interaction Coding System. Children's dietary adherence was assessed according to deviations from the prescribed number of carbohydrate units per meal and recommended carbohydrate intake levels per day. Glycaemic control was measured via 14 days of self-monitoring of blood glucose levels. Results: Findings demonstrated significant negative associations between children's dietary adherence and two dimensions of family functioning: Task Accomplishment (r=,0.43, P= 0.03) and Behavioral Control (r=,0.54, P= 0.00). Affect Management correlated negatively with the percent of blood glucose levels below the normal range (r=,0.33, P= 0.05). Eleven families (31%) of young children with type 1 diabetes demonstrated mealtime family functioning in the unhealthy range. Conclusions: This was the first study to examine the relationship between mealtime family functioning and children's dietary adherence and glycaemic control in families of young children with T1DM. Previous research has found mealtime family functioning to be impaired in families of young children with T1DM when compared with families of children without diabetes. Research is needed to determine if family functioning and dietary adherence can be improved via specific family-based behavioural training around mealtimes. [source] Caloric Restriction and Calcium's Effect on Bone Metabolism and Body Composition in Overweight and Obese Premenopausal WomenNUTRITION REVIEWS, Issue 12 2004Tim L. Radak DrPH Obesity results in numerous preventable deaths and comorbidities. Unfortunately, a reduction of body weight has been correlated with a reduction in bone mass, the reasons for which have not been fully elucidated. The importance of maximizing peak bone mass during premenopausal years is well known. Most studies demonstrate a positive relationship between calcium intake and bone mass. However, during caloric restriction, which is commonly used for weight loss, calcium intake has shown mixed results. Calcium from dairy sources has received additional attention, beyond its importance to bone, for its role in regulating body weight and composition. Dairy foods are perceived as high fat, and therefore, are generally minimized or avoided during caloric restriction. The current calcium intake for premenopausal women is significantly below recommendations, and even if met during caloric restriction, may not be adequate. This review underscores the need for maintaining at least adequate intake levels of calcium, if not more, during weight loss regimens to minimize potential long-term detrimental effects on bone metabolism. [source] Reduced water oxygen levels affect maximal feed intake, but not protein or energy utilization efficiency of rainbow trout (Oncorhynchus mykiss)AQUACULTURE NUTRITION, Issue 1 2009B.D. GLENCROSS Abstract This study examined the effect of reduced water oxygen levels on the utilization efficiencies of energy and protein from a diet fed to rainbow trout. An experimental diet was fed at one of the four ration levels with an additional starved treatment also included in each oxygenation regime. Oxygen levels in each oxygenation regime varied with ration level, but averaged 9.3 ± 0.36 mg L,1 for the normal regime and 5.7 ± 1.4 mg L,1 for the hypoxia regime. Significant differences were observed in the apparent satietal feed intake levels in each oxygenation regime, but not at any of the pair-fed restricted levels. No significant effects of oxygenation regime were observed on the utilization of either energy or protein by the fish. Efficiency of protein use varied depending on the protein intake level, but was not significantly affected by oxygenation regime. This study demonstrates that a reduction in the oxygen levels of the water does not affect the utilization efficiency of dietary digestible protein and energy in rainbow trout, but does result in a downregulation of feed intake when the fish is fed to apparent satietal levels. [source] Lysine deposition responds linearly to marginal lysine intake in Atlantic salmon (Salmo salar L.) parrAQUACULTURE RESEARCH, Issue 2001R C Hauler Abstract This study investigated lysine utilization at marginal lysine intake (mg day,1) in Atlantic salmon (Salmo salar L) parr fed diets similar to those used in dose,response lysine requirement experiments. Duplicate tanks of salmon were fed Diet PL20.1 (20.1 g lysine kg,1 and 19.8 MJ DE kg,1) containing 54% of the lysine in the crystalline (free) form at four intake levels for 50 days. Feed intake levels were measured at 0.59, 0.85, 1.10 and 1.16 (satiation)%BW day,1. In addition, duplicate tanks of salmon were fed to satiation with Diets FML9.1 (9.1 g lysine kg,1) and FML20.7 (20.7 g lysine kg,1) in which lysine was derived almost entirely from fish meal. Feed intakes of FML9.1 (0.70%BW day,1) and FML20.7 (1.21%BW day,1) were significantly lower and higher (P < 0.001) than the satiation intake of the Diet PL20.1, respectively. Over all dietary treatments, lysine deposition was dependent on lysine intake (LI, mg day,1) as described by the equation: lysine deposition (mg day,1) = 0.708LI , 0.035 (r2 = 0.97, n = 12, P < 0.001). Addition of marginal lysine intakes from Atlantic salmon dose,response lysine requirement literature resulted in an equivalent relationship. The linear relationship suggests that lysine utilization remains constant at marginal lysine intake over different dietary formulations and life-stages. Consequently, the lysine requirement (allowance) of Atlantic salmon would be more appropriately estimated by a factorial approach, assuming constant efficiency of lysine utilization and the addition of obligatory lysine loss (maintenance). Efficiency of lysine utilization and obligatory lysine loss was estimated to be 71% and 0.05 mg day,1 from the current experiment and 78% and 0.10 mg day,1 with the addition of the literature data. Based on the constant lysine utilization observed in this study, it is proposed there is a need to re-evaluate lysine requirements expressed as a dietary concentration. [source] | ||||||||||||||||