A nurse is providing discharge teaching to a client who has bipolar disorder and will be discharged with a prescription for lithium. The nurse should teach the client that which of the following factors puts her at risk for lithium toxicity?

The correct answer is C: The client runs 4 miles outdoors every afternoon. Vigorous exercise can increase the risk of lithium toxicity as it leads to dehydration, which can alter lithium levels in the body. Running 4 miles daily can cause significant fluid loss, potentially leading to lithium toxicity.

A: The client drinks 2 liters of liquids daily - This is actually a good practice to maintain hydration and prevent lithium toxicity.
B: The client eats 2 to 3 gm of sodium-containing foods daily - Sodium intake is important for lithium excretion and helps prevent toxicity.
D: The client eats foods high in tyramine - Tyramine is not directly related to lithium toxicity, it is more associated with interactions with MAOIs.