Showing papers on "Mineral absorption published in 1991"
TL;DR: The studies summarized in this review show that the recommendation for increasing dietary fiber in Western communities would not be expected to have any adverse effect on mineral absorption if the authors increase not only the intake of fiber, but also the dietary intake of other food components such as protein and ascorbic, citric, and oxalic acids.
Abstract: In general, it has been shown that dietary fiber may bind metallic cations in both in vitro and in vivo studies. However, there clearly are many unresolved questions on the effects of high-fiber diets on mineral availability. On one side, the effects of fiber on the utilization of nutrients vary greatly with the amount and type of fiber. In addition, there are many agents in both food and the digestive tract that may affect the mineral binding to fiber: some agents may inhibit binding, while others will enhance it. Also, there are several major difficulties in drawing conclusions from the in vitro and in vivo studies due to the different experimental conditions, methods used to follow the mineral balance, etc. Finally, it must be borne in mind that fiber and phytic acid occur together in fiber-rich diets and, thus, it is difficult to separate the effects of fiber and phytate in the utilization of most essential polyvalent metallic ions. The studies summarized in this review show that the recommendation for increasing dietary fiber in Western communities would not be expected to have any adverse effect on mineral absorption if we increase not only the intake of fiber, but also the dietary intake of other food components such as protein (both vegetable and animal protein) and ascorbic, citric, and oxalic acids (in fruits and vegetables). The adequate intake of minerals, fat, and simple sugars are maintained with this type of diet. The recommendations should be best interpreted in such a way as to prevent the consumption of excessive amounts of phytate, particularly for those whose mineral needs are great. Further studies are still needed in this field in order to understand the conflicting results published in the literature regarding the effects of fiber on the utilization of minerals; however, the studies reviewed in this article may give us an idea of the complexity of mineral availability in fiber-rich, phytate-rich diets.
301 citations
TL;DR: The influence of NaCl solutions of decreasing osmotic potentials (¥π = 0.44 and 0.88 MPa) on seedling growth and on the concentration of the most important macro and micro-nutrients in the shoots and roots of maize (Zea mays L., cv. Summer II) grown in Hoagland's solution in a growth chamber was studied as mentioned in this paper.
Abstract: The influence of NaCl solutions of decreasing osmotic potentials (¥π = ‐0.44 and ‐0.88 MPa) on seedling growth and on the concentration of the most important macro‐ and micro‐nutrients in the shoots and roots of maize (Zea mays L., cv. Summer II) grown in Hoagland's solution in a growth chamber was studied. Salt stress was imposed on six‐day‐old seedlings for a three day period. Increasing NaCl concentrations induced a reduction in the leaf water potential and a significant decrease in the length and dry weight of the shoots, whereas these two parameters decreased in the roots only at the lowest osmotic potential. Although the absorption and accumulation of nutrients upon salt stress differed in the two treatments depending on the plant tissue and nutrient, almost all of the macronutrients decreased in the roots and shoots, showing the lowest values at ¥π = ‐0.88 MPa. Sodium and Cl increased continuously, much more in the roots than in the shoots. A different response was seen in the shoots and r...
116 citations
TL;DR: A solution to get the problem off, have you found it? Really? What kind of solution do you resolve the problem? From what sources? Well, there are so many questions that we utter every day as discussed by the authors.
15 citations
TL;DR: Data indicate that a pathological response to D3 intoxication occurred and that hepatic and renal excretory functions were impaired, and it appears, therefore, that these animals function optimally at the low concentrations of D3 metabolites found naturally.
Abstract: The damara mole rat, Cryptomys damarensis, is a strictly subterranean dwelling herbivorous rodent that in its natural habitat has no access to any obvious source of cholecalciferol (D3). We examined the effects of D3 supplementation, at physiological and supraphysiological doses, on calcium metabolism, plasma concentrations of calcium and alkaline phosphatase (ALP) and D3 metabolites. Animals not receiving a D3 supplement maintained normal plasma calcium concentrations. In addition, they exhibited a high apparent fractional mineral absorption efficiency (91%) and maintained a positive mineral flux. The serum concentration of 25-(OH)D3 was undetectable (less than 5 nmol/l) and that of 1,25-(OH)2D3 was 41 +/- 10 pmol/l. Supplementation at a physiological dose of D3 resulted in increased plasma concentrations of D3 metabolites, food intake, apparent fractional absorption efficiency and apparent fractional retention efficiency. Despite the 1.8-fold increase in food intake, body mass remained constant suggesting that the enhanced energy intake was dissipated in catabolic processes. Plasma calcium and ALP concentrations were not significantly altered with physiological doses of D3. The group given supraphysiological doses of D3 exhibited hypercalcaemia, increased creatinine concentrations and markedly increased ALP levels. These data indicate that a pathological response to D3 intoxication occurred and that hepatic and renal excretory functions were impaired. It appears, therefore, that these animals function optimally at the low concentrations of D3 metabolites found naturally. Supplementation at both physiological and supraphysiological doses of D3 may disadvantage the damara mole rat.
11 citations
Patent•
29 May 1991
TL;DR: In this paper, the authors proposed a mineral absorption promoter comprising both lactosucrose and a mineral-containing substance which improves absorption of mammalian digestive organs by the combination of the substance and lactosocrose having the structure shown by the formula.
Abstract: PURPOSE: To obtain a mineral absorption promoter, improving mineral absorption from mammalian digestive organs, facilitating intake of mineral liable to be short, comprising a mineral-containing substance and lactosucrose. CONSTITUTION: The objective mineral absorption promoter comprising both lactosucrose and a mineral-containing substance which improves absorption of mammalian digestive organs by the combination of the substance and lactosucrose having the structure shown by the formula. COPYRIGHT: (C)1992,JPO&Japio
5 citations
TL;DR: The reasons why the elderly population is at increased risk of developing mineral deficiencies, the current understanding of the mineral requirements of this vulnerable group, and a consideration of recommendations for future research needs in this area are reviewed.
Abstract: Increasing attention is being paid to the relationship between nutrition and health, particularly in regard to the possible linkage between nutrition and the development of chronic disease The elderly are likely to suffer from one or more chronic diseases The impact of these diseases on mineral status of the elderly population is poorly understood In addition, little information is available about the mineral requirements of this population The focus of this paper is to review the reasons why the elderly population is at increased risk of developing mineral deficiencies, our current understanding of the mineral requirements of this vulnerable group, and a consideration of recommendations for future research needs in this area For illustrative purposes, special attention has been given to three selected mineral nutrients: phosphorus, magnesium and zinc Research priorities include studies to: improve methods for assessing mineral status; investigate the relation of habitual mineral intake and status; assess the impact of dietary change on mineral bioavailability in the elderly; determine the effect of hypochlorhydria on intestinal mineral absorption; and assess the effects of aging on the adaptive response to low mineral intakes Studies such as these will help to provide a stronger research data base for estimating Recommended Dietary Allowances for these mineral nutrients in the elderly
5 citations
TL;DR: It is concluded that dieters should be supplemented with minerals to replenish the body resources before embarking on low-energy diets, and must be interrupted by periods of normal alimentation if the need calls for their repetition.
Abstract: Because of the controversy among reports as to whether dietary fiber interferes with mineral absorption or not, we investigated the effect of dietary citrus pectin in a low-caloric, processed formula on serum calcium (Ca), zinc (Zn), copper (Cu), and iron (Fe) in 14 healthy obese Egyptian women undergoing weight reduction over a four-week period. The total caloric supply was 1, 000kcal/day. There was no difference between pre- and post-study values in the serum Ca. This was ascribed to the fact that water-soluble dietary fibers are fermented in the colon with the generation of short-chain fatty acids, which besides being absorbed, also enhance colonic divalent cation absorption. There was a numerical non significant decrease well within the reference values of Zn (-4.87%), Cu(-6.42%), and Fe(-19.65%). These results were discussed in light of the suggestion that the Zn, Cu, and Fe status is one aspect of an integrated acute-phase response. The response might have been triggered earlier by obesity, and later on augmented by the nutritional and psychological stress superimposed by the slimming diet. Hence, we conclude that dieters should be supplemented with minerals to replenish the body resources before embarking on low-energy diets. These diets should be of short duration, and must be interrupted by periods of normal alimentation if the need calls for their repetition.