New York and Boston-the healthy way

Hi All

I am traveling to New York and Boston at the end of November. My boyfriend thinks the fact hat you can eat pizza everyday is great but since I'm trying to lose weight I don't want to jeopardise it. Can anyone suggest good place to eat that aren't very expensive.

Also how much are you likely to spend on food drink. For example how much is a wrap or roll, beer, vodka and diet coke, average dinner? Just want to have the best time possible!

Thanks