High-nitrogen formulas such as Isosource HN and Fibersource HN have what characteristic or effect?

• A. They provide low protein content
• B. They are never used in renal disease
• C. They can increase renal load and water requirements
• D. They require no water intake

Answer: (C)

High-nitrogen formulas have more protein, which raises the amount of nitrogenous waste the body must excrete. When protein intake goes up, the kidneys have to process more urea and other solutes, increasing the renal solute load. To flush out these solutes, more urine is produced, so the overall water requirement for the patient rises. This is why these formulas can raise both renal workload and fluid needs, especially in individuals with limited kidney function or fluid management concerns. They’re not low-protein formulas, and they don’t eliminate the need for water; in fact, they typically require more water to maintain balance.