Phosphate intake, hyperphosphatemia, and kidney function

Area of Science:

• Nephrology
• Endocrinology
• Nutrition Science

Background:

• Phosphate homeostasis is crucial for life, regulated by kidneys, intestine, parathyroid glands, and skeleton via calcitriol, parathyroid hormone, and FGF23.
• Increased dietary phosphate intake, driven by ultraprocessed foods, now averages twice the recommended allowance.
• Incomplete dietary phosphate assessment complicates studies on chronic high intake effects.

Purpose of the Study:

• To review recent advancements in understanding the relationship between dietary phosphate intake and kidney function decline.
• To highlight the impact of high phosphate intake on renal adaptation and potential adverse outcomes.

Main Methods:

• Review of experimental intervention studies and epidemiological data.
• Analysis of hormonal regulation and renal phosphate handling.
• Examination of consequences of hyperphosphatemia on kidney health.

Main Results:

• Chronic high dietary phosphate intake can overwhelm renal adaptation, leading to sustained hyperphosphatemia.
• The homeostatic response to phosphate loading may increase kidney function decline risk due to renal inflammation.
• High phosphate intake and hyperphosphatemia are linked to kidney function decline, cardiovascular disease, and mortality, even in normal renal function.

Conclusions:

• Elevated dietary phosphate intake presents a significant risk factor for kidney function decline and associated adverse health outcomes.
• The detrimental effects of high phosphate intake extend to individuals with previously normal kidney function.
• Further research and accurate dietary assessment are crucial for managing phosphate intake and mitigating kidney disease progression.