GLOSSARY

Phosphorus is essential in bone, nucleic acids and energy transfer, with many functions occurring through phosphate compounds.

Phosphorus contributes to bone, nucleic acids, phospholipids and energy-transfer molecules, commonly reacting as phosphate. Its place in ATP does not mean phosphate supplies calories or guarantees more energy from supplements. Athletes need energy and many nutrients for metabolism. A key pathway component is not automatically the limiting factor for performance; assess overall adequacy and the actual reason for considering supplementation.

Meat, dairy, legumes, nuts and grains contain phosphorus, and some foods include phosphate additives. Availability differs: plant phytate-bound phosphorus is generally less accessible than additive phosphate. A high phosphorus content alone does not determine food quality. In kidney disease, source and additives deserve particular attention, with restrictions guided by clinical assessment rather than a universal ban on nutritious protein foods.

Intestine, kidneys and bone regulate phosphate with hormones including parathyroid hormone and FGF23. Much phosphorus is in tissues and skeleton, so serum concentration is not the whole store. Food, renal excretion and cellular shifts affect results. A calcium-to-phosphorus ratio is not an independent numerical target for athletes without considering actual amounts, adequacy and underlying disease.