Phosphates Added to Cereal Can Spike Blood Phosphorus Levels

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Eating cereal before bedAccording to study researchers from Houston Methodist hospital, not only can too much dietary phosphate clot blood vessels and enlarge the heart, but where the phosphates come from plays an active role—so much so that it can have detrimental effects in both healthy individuals and those with chronic kidney disease.

The study, which will be published in the August 2015 issue of the American Journal of Clinical Nutrition, suggests that phosphates added to dairy and cereal products can cause bigger spikes in blood phosphorus levels compared to naturally occurring phosphates. This could potentially put harmful stress on kidneys.

The estimated average requirement for phosphate is 580 milligrams per day. On average, most individuals are consuming more than three times that amount.

In order to distinguish an association between organic phosphate and inorganic phosphate intake with serum phosphate levels, researchers evaluated the diets of 7,895 individuals from the National Health and Nutrition Examination Survey.

Researchers discovered that inorganic phosphate additives found in dairy foods, as well as cereal and grain products, played a significant role in increasing serum phosphate concentration, even though these foods tend to be consumed less frequently than foods without the additives.

“High phosphorus in blood is associated with increased patient mortality, increased blood vessel stiffening, as well as increasing the rate of calcium deposition in heart valves. This calcium comes out of bones and, therefore, weakens bones and damages kidneys,” states principal investigator Wadi Suki, M.D. “A general rule is that if you aren’t sure which foods contain added phosphate, the outside aisles at supermarkets are better than the ones in the middle.”

Since manufacturers are not required to include phosphorus on the nutrition facts table (although they could list it on the ingredients list), the responsibility is on consumers to make healthy choices.

Sources for Today’s Article:
Houston Methodist, “Foods with added phosphate cause spike in blood, even in people with healthy kidneys,” ScienceDaily web site, July 21, 2015; www.sciencedaily.com/releases/2015/07/150721102751.htm.
Moore, L.W., et al., “Association of dietary phosphate and serum phosphorus concentration by levels of kidney function,” American Journal of Clinical Nutrition 2015, doi:10.3945/ajcn.114.102715.




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Leah Shainhouse is a Registered Dietitian with the College of Dietitians of Ontario and a member of the Dietitians of Canada. She graduated with a Bachelor of Science, Honors, in Nutritional Sciences from the University of British Columbia and went on to complete her dietetic training and Master of Science degree in Human Nutrition at McGill University. Leah has a strong desire to help shape the lives of individuals through a healthy lifestyle. She enjoys working with people to help... Read Full Bio »