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The National Brand Iron (1998)

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Therefore, an Adequate Intake AI was set based on estimated mean intakes. Few serious adverse effects have been associated with excess intake of chromium from food.

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Chromium III is the most stable oxidation state Greenwood and Earnshaw, and presumably is the form in the food supply due to the presence of reducing substances in foods. Page Share Cite Suggested Citation: The National Academies Press.

Schwarz and Mertz identified chromium as the element that restored glucose tolerance in rats. Impaired glucose tolerance of malnourished infants responded to an oral dose of chromium chloride Hopkins and Majaj, ; Hopkins et al.

A number of studies have demonstrated beneficial effects of chromium on circulating glucose, insulin, and lipids in a variety of human subjects and animal species; however, not all reports of supplementation are positive Anderson, ; Anderson et al.

Progress in the field has been limited by lack of a simple, widely accepted method for identification of subjects who are chromium depleted, and thus who would be expected to respond to chromium supplementation, and by the difficulty in producing chromium deficiency in animals.

Recent work by Davis and Vincent a, b and Vincent suggests that a low molecular weight chromium-binding substance LMWCr may amplify insulin receptor tyrosine kinase activity in response to insulin. It is proposed that the inactive form of the insulin receptor IR is converted to the active form by binding insulin, which stimulates the movement of chromium from the blood into the insulin-dependent cells and results in the binding of apoLMWCr to chromium Figure The holoLMWCr then binds to the insulin receptor activating the tyrosine kinase.

The ability of LMWCr to activate insulin receptor tyrosine kinase depends on its chromium content. When insulin concentration drops, the holoLMWCr is possibly released from the cell to terminate its effects.

Physiology of Absorption, Metabolism, and Excretion Absorption estimates for chromium III, based on metabolic balance studies or on urinary excretion from physiological intakes, range from 0. Most chromium compounds are soluble at the pH of the stomach, but less soluble hydroxides may form as pH is increased Mertz, Page Share Cite Suggested Citation: Adapted from Vincent The environment of the gastrointestinal tract and ligands provided by foods and supplements are important for mineral absorption Clydesdale, Several dietary factors that affect chromium absorption will be discussed in the bioavailability section of this chapter.

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These data suggest regulation of chromium absorption in these intake ranges. A number of studies have reported increased urinary excretion of chromium with aerobic exercise Anderson et al. A recent study using 53Cr demonstrated that acute and chronic resistive exercise may increase chromium absorption as determined by the increased urinary excretion of the 53Cr isotope Rubin et al. Further studies will be needed to clarify how much of the observed beneficial effects of exercise on glucose and insulin metabolism may be due to improved chromium absorption.

Chromium competes for one of the binding sites on transferrin Harris, Several studies have investigated possible interactions between iron and chromium.

The excessive iron in hemochromatosis has been hypothesized to interfere with the transport of chromium, thereby contributing to the diabetes associated with this condition Lim et al. No long-term studies have addressed this question.

In humans, chromium concentrates in liver, spleen, soft tissue, and bone Lim et al. Similar patterns are seen in rats with accumulation in kidney, spleen, and bone as well as liver and testes Hopkins, ; Kamath et al. A three-compartment model with half-lives of 0.

Onkelinx also proposed a three-compartment model in rats, but suggested different characteristics for the third compartment. Additional modeling work with patients having adult onset diabetes and normal control subjects utilized a compartment within the blood and slow and fast tissue compartments Do Canto et al.

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A half-life for urinary excretion of chromium of 0. The compartment that represented long-term tissue deposition had an extremely slow return rate of days for patients with diabetes and days for control subjects. Most ingested chromium is excreted unabsorbed in the feces Mertz, ; Offenbacher et al. Excretion via bile is not a major contributor to fecal chromium Davis-Whitenack et al. Most absorbed chromium is excreted rapidly in the urine Anderson et al. A recent report from England indicated significant age-related decreases in the chromium concentrations in hair, sweat, and urine Davies et al.

The first, a female who had received TPN for more than 3 years, developed unexplained weight loss and peripheral neuropathy. Her plasma glucose removal was impaired, plasma free fatty acids were elevated, and her low respiratory quotient indicated poor utilization of carbohydrates. The other two patients responded similarly to chromium supplementation Brown et al. Prevalence of impaired glucose tolerance was Addressing this question is difficult because of the current lack of information about variability in dietary chromium intakes and because there is not an easily usable clinical indicator to identify potential study subjects with poor chromium status.

There is considerable interest in chromium supplementation in Type II diabetes, but no large-scale controlled trials have been reported in the United States. Mean body weight of the subjects was 69 kg. Data collected at baseline and after 2 and 4 months of supplementation included standard health histories, fasting glucose and insulin, glycosylated hemoglobin, and glucose and insulin concentrations 2 hours after a g glucose load. After 2 months, fasting and 2-hour insulin concentrations were decreased significantly at both supplement levels.

The reductions in glucose and insulin concentrations were maintained for 4 months; additionally, glycosylated hemoglobin became significantly lower in both dose groups at 4 months Anderson et al. There are no data available on the basal dietary intake of chromium in these diabetic subjects.