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