Final answer:
Encouraging fluid intake is an appropriate intervention for hyponatremia caused by insufficient intake.
Step-by-step explanation:
Hyponatremia caused by insufficient intake can be treated by encouraging fluid intake. Hyponatremia is a lower-than-normal concentration of sodium in the body, usually associated with excess water accumulation, which dilutes the sodium. In cases of dehydration, it is important to increase fluid intake to help restore sodium levels.