Final answer:
The nurse should provide dietary instruction for managing both chronic obstructive pulmonary disease (COPD) and congestive heart failure-related dependent edema. A low-sodium diet is recommended to reduce fluid retention and decrease workload on the heart.
Step-by-step explanation:
The patient is exhibiting signs of dependent edema in both lower legs, which can be caused by fluid retention due to congestive heart failure. Given the history of chronic obstructive pulmonary disease (COPD), the nurse should provide dietary instruction to manage both conditions. A low-sodium diet is recommended to reduce fluid retention and decrease the workload on the heart. This includes avoiding high-sodium foods such as processed meats, canned soups, and fast food. The patient should also be encouraged to eat a balanced diet with adequate protein, fruits, vegetables, and whole grains to support overall health.