answer: Bill and Mary eat some healthy food because they all want to lower the risk of heart attack, stroke, and high blood pressure.
documents: #Person1#: I can't believe my eyes, Bill. Are you having a salad for lunch? No hamburger?
  #Person2#: Get used to it, Mary. I'm off hamburgers for good health. Most fast food is loaded with sodium.
  #Person1#: I know. But why are you suddenly interested in lessening your salt intake?
  #Person2#: My doctor says I should cut back on sodium-rich foods to lower my blood pressure.
  #Person1#: Do you have hypertension? I would have thought you were too young.
  #Person2#: Actually, my blood pressure isn't that high yet, but they say it increases with age.
  #Person1#: Well, I'm glad you're starting to pay more attention to your diet.
  #Person2#: I want to lower my risk of heart attack and stroke, too.
  #Person1#: So do I. That's why I've been trying to lower my cholesterol level.
  #Person2#: I've noticed you've been munching away on lots of fruits and vegetables recently.
  #Person1#: That's right. I could stand to lose a few pounds, too.