I only saw your two posts...silly computers!!
I'm in agreement that a diet change would likely affect both breasts.
I believe that with a breast infection, the milk can tast 'saltier', perhaps that is what is happening? Perhaps a bplugged duct or something? http://www.kellymom.com/bf/concerns/mom/mastitis.html
Take a look and follow up, okay?
A plug or mastitis is the only thing I can think of as well although I would have thought you'd have had other symptoms with that.
The reason I think you are confused is because the header "replies" is being used as a synonym for "number of posts in thread". So when someone creates a new thread it will read "1 new" under Replies. After someone replies to the original post in the thread it will change to "1 new of 2". Seeing "1 new" under Replies does no mean there is 1 reply to the original post as one might logically. When I first starting following the IV boards that confused me too.