Just from forums and talking to friends, I wonder if the nhs needs to emphasise that breastfeeding is NOT like pregnancy in that you can eat what you like and have (small) drinks.
There do seem to be still these myths about dairy, cabbage, coffee ... of course some cut them out but everyone doesn't have to.
I know friends who tried but "wanted to eat cheese and wine" again so quit early. No one told them the rules for pregnancy are different.
I often come across it in blogs (eg one today bemoaning a teetotal Xmas as her toddler still bfs once a day).
OK I sound a glutton but if it were true it would put me off! I have a small beer or glass of wine with my dinner and eat what I like. I even got someone query it once - I snapped "I'm not PREGNANT it's a baby belly" 
Anyway with this "tell women what to do" culture it would be nice to ensure people knew...