Decreased Absorption of Calcium, Magnesium, Zinc and Phosphorus by Humans Due to Increased Fiber and Phosphorus Consumption as Wheat Bread

Abstract

Abstract. During a 20 day period of high fiber consumption in the form of bread made partly from wheaten wholemeal, two men developed negative balances of calcium, magnesium, zinc and phosphorus due to increased fecal excretion of each element. The fecal losses correlated closely with fecal dry matter and phosphorus. Fecal dry matter, in turn, was directly proportional to fecal fiber excretion. Balances of nitrogen remained positive. Mineral elements were well‐utilized by the same subjects during a 20 day period of white bread consumption.

Not all forms of dietary phosphorus are equal: an evaluation of postprandial phosphorus concentrations in the plasma of the cat

“…Differing levels of SDHP in the two diets apparently explain the higher peak in plasma P in cats fed diet A, which also had a lower Ca:P than diet K. These two factors may explain the marked increase in plasma PTH, decrease in plasma iCa and increased urinary P excretion observed in cats fed diet A compared with diet K. Diet A also contained higher Na (3·33 g/4184 kJ (1000 kcal) compared with 1·35 g/4184 kJ (1000 kcal)) and less crude fibre (5·2 g/4184 kJ (1000 kcal) compared with 7·49 g/4184 kJ (1000 kcal)) than diet K. Increasing Na has been reported to increase P absorption of minerals through increasing Na + -dependent uptake of phosphate in rats ( 58 ) . In addition, diets with reduced crude fibre show increased absorption of minerals in humans ( 59 ) . With these differences in mind, it is surprising to note that when 5 d digestibility was measured by Alexander et al ( 20 ) the mean apparent digestibility of P was 49·3 % for diet A and 51·5 % for diet K and may indicate that the dietary differences are not important for digestibility in this case.…”

Role of Diet and Salvia miltiorrhiza to Manage Osteoporosis

“…Carbohydrate should be a mixture of simple and complex carbohydrates. Dietary fiber should not be provided in large amounts as fiber forms chelates with calcium and makes calcium unavailable for absorption in the gastrointestinal tract [32]. Fortified breakfast cereals, fruits and vegetables, especially fruits and vegetables rich in phosphorous should be given.…”

Dietary Fiber and Availability of Nutrients: A Case Study on Yoghurt as a Food Model

“…The behavior in delaying absorption could be likely to alter the gut endocrine response both by carrying material further down the small intestine prior to absorption as well as by producing a flatter blood glucose profile. On the other hand, dietary fiber may influence the availability of minerals, such as calcium, magnesium [154] and iron [155]. Animal studies have found that dietary chitosan possibly arrests the absorption of calcium [156,157].…”