A client with chronic kidney disease stage 4 has a serum phosphorus of 6.8 mg/dL (normal 2.5-4.5). What dietary teaching is MOST relevant?

HYPERPHOSPHATAEMIA in CKD occurs because damaged kidneys cannot excrete phosphate effectively. ELEVATED PHOSPHATE has serious consequences: BINDS CALCIUM — hyperphosphataemia causes hypocalcaemia by precipitation (calcium binds with phosphate and deposits in tissues rather than circulating); CALCIPHYLAXIS — calcium-phosphate deposits in blood vessels and soft tissue (vascular calcification is a major cause of cardiovascular mortality in CKD); SECONDARY HYPERPARATHYROIDISM — the parathyroid gland responds to low calcium by secreting PTH, which pulls calcium from bones (renal osteodystrophy); DIETARY PHOSPHATE RESTRICTION: Avoid: dairy products (milk, cheese, yogurt — very high phosphate); dark cola sodas (phosphoric acid added as preservative — avoid all dark colas); processed meats and fast food (phosphate preservatives); nuts and seeds; chocolate; beer and whole grains; Choose: egg whites (protein with low phosphate); fresh fruits and vegetables; white bread and white rice (lower phosphate than whole grain); PHOSPHATE BINDERS: Taken WITH every meal and snack; bind dietary phosphate in the GI tract to prevent absorption; types: calcium carbonate (Tums), calcium acetate (PhosLo), sevelamer (non-calcium, preferred when calcium is already high), lanthanum carbonate; NURSING TEACHING: Take binders WITH food (not before, not after); binders are ineffective if taken on an empty stomach; even small high-phosphate snacks require a binder dose.