Processed foods with phosphorus additives contribute to chronic kidney disease
Processed and fast foods enriched with phosphorus additives may play a role in health disparities in chronic kidney disease, according to a study appearing in an upcoming issue of the Journal of the American Society of Nephrology .
Orlando M. Gutierrez, MD, MMSc, lead author; Myles Wolf, MD, MMSc, senior author; (University of Miami Medical School) and colleagues analyzed phosphate levels in the blood of patients participating in the Chronic Renal Insufficiency Cohort Study (CRIC), a prospective cohort study established by the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) to examine risk factors for kidney disease progression and cardiovascular disease in patients with CKD." Many studies have demonstrated that an elevated level of phosphate in the blood is associated with adverse outcomes in patients withCKD and that blacks have higher phosphate levels than whites but we did not understand why levels are higher in blacks," said Wolf. "Our earlier work in the general population suggested that poverty was linked to a higher phosphate level, so we decided to delve deeper into that connection in the setting of chronic kidney disease."
Among the 3,612 racially and ethnically diverse participants, those with the lowest incomes and those who were unemployed had higher phosphate concentrations in their blood than participants with higher income and rates of employment. Furthermore, there was no difference in phosphate levels by race when only blacks and whites in the lowest income group were compared. The investigators concluded that the known racial difference in phosphate levels is largely driven by differences in socioeconomic status.
"For low-income patients, access to healthy food choices is limited, so their diet tends to consist of processed and fast foods heavily enriched with highly-absorbable phosphorus additives," said Gutierrez. "The amount of phosphorus additives in food is not always listed, so people unknowingly ingest more phosphorus than they probably should."
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