CSR Medical Nutrition Therapy for Renal Conditions 2 — Questions and Answers
Question 1: A patient with CKD stage 4 has a serum phosphorus of 6.2 mg/dL. Which dietary strategy should be prioritized FIRST before initiating phosphate binders?
- Restrict dietary phosphorus to 800–1000 mg/day (Correct answer)
- Increase calcium intake to bind phosphorus in the gut
- Eliminate all dairy products regardless of overall intake
- Restrict protein to less than 0.6 g/kg/day immediately
Correct answer: Restrict dietary phosphorus to 800–1000 mg/day
Dietary phosphorus restriction to 800–1000 mg/day is the first-line intervention before adding phosphate binders.
Question 2: Which type of dietary phosphorus is absorbed most efficiently in the gastrointestinal tract?
- Phytate-bound phosphorus from whole grains
- Organic phosphorus from animal protein
- Inorganic phosphorus from food additives (Correct answer)
- Phosphorus naturally present in vegetables
Correct answer: Inorganic phosphorus from food additives
Inorganic phosphorus from food additives is nearly 100% absorbed, making it the most bioavailable form.
Question 3: A hemodialysis patient is consistently hyperkalemic. Which cooking method is most effective for reducing potassium content in vegetables?
- Steaming vegetables in a covered pot
- Leaching by peeling, soaking in water, and boiling in fresh water (Correct answer)
- Microwaving with minimal water
- Roasting at high temperature
Correct answer: Leaching by peeling, soaking in water, and boiling in fresh water
Leaching—peeling, soaking, and boiling in fresh water—removes the greatest amount of potassium from vegetables.
Question 4: An ESRD patient on peritoneal dialysis is gaining weight and has elevated blood glucose. What is the PRIMARY source of extra calories causing these issues?
- Increased protein intake from dialysate
- Glucose absorption from peritoneal dialysate (Correct answer)
- Excessive dietary fat consumption
- Glycogen storage from carbohydrate overeating
Correct answer: Glucose absorption from peritoneal dialysate
PD patients absorb a significant amount of glucose from the dextrose-containing dialysate, contributing to weight gain and hyperglycemia.
Question 5: Which vitamin supplement is routinely recommended for dialysis patients due to losses during treatment?
- Fat-soluble vitamins A, D, E, and K
- Vitamin C at doses above 1000 mg/day
- Water-soluble B vitamins and vitamin C at renal doses (Correct answer)
- High-dose vitamin E for antioxidant protection
Correct answer: Water-soluble B vitamins and vitamin C at renal doses
Water-soluble B vitamins and vitamin C (limited to ≤100 mg/day in renal patients) are lost during dialysis and require supplementation.
Question 6: A renal transplant patient at 6 months post-transplant presents with weight gain and hyperlipidemia. Which dietary modification is most appropriate?
- Continue the pre-transplant phosphorus restriction strictly
- Implement a heart-healthy diet with reduced saturated fat and refined sugars (Correct answer)
- Increase potassium intake to normalize post-transplant levels
- Restrict all carbohydrates to less than 50 g/day
Correct answer: Implement a heart-healthy diet with reduced saturated fat and refined sugars
Post-transplant, immunosuppressive medications increase cardiovascular risk, making a heart-healthy diet the priority over strict mineral restrictions.
Question 7: In a patient with nephrotic syndrome and significant proteinuria, what is the recommended protein intake per current guidelines?
- 0.6 g/kg/day to minimize urinary protein losses
- 0.8 g/kg/day plus a gram per gram of urinary protein lost (Correct answer)
- 1.5–2.0 g/kg/day to replace lost protein
- 2.0 g/kg/day as protein restriction is not indicated
Correct answer: 0.8 g/kg/day plus a gram per gram of urinary protein lost
Current guidelines recommend 0.8 g/kg/day plus replacement of urinary protein losses (1 g dietary protein per gram proteinuria) in nephrotic syndrome.
CSR Medical Nutrition Therapy for Renal Conditions 2
A patient with CKD stage 4 has a serum phosphorus of 6.2 mg/dL.
Which dietary strategy should be prioritized FIRST before initiating phosphate binders?