M.G., a "frequent flier," is admitted to the emergency department (ED) with a diagnosis of heart failure (HF). She was discharged from the hospital 10 days ago and comes in today stating, "I just had to come to the hospital today because I can't catch my breath and my legs are as big as tree trunks." After further questioning, you learn that she is strictly following the fluid and salt restriction ordered during her last hospital admission. She reports gaining 1 to 2 pounds every day since her discharge.
What error in teaching most likely occurred when M.G. was discharged 10 days ago?