Final answer:
A resident may need a fluid-restricted diet due to conditions that cause hypervolemia, such as heart failure or kidney disease, leading to overhydration.
Step-by-step explanation:
A resident may be on a fluid-restricted diet due to overhydration or hypervolemia. Hypervolemia is caused by the retention of water and sodium, which can be seen in conditions such as heart failure, liver cirrhosis, certain forms of kidney disease, hyperaldosteronism, and some glucocorticoid steroid treatments.
It leads to an excessive fluid volume in the body, and the goal of a fluid-restricted diet is to help restore homeostasis by reducing fluid intake to reverse the condition that caused the hypervolemia.