i would say you just have to keep trying with the healthy choices; kids will not always do what you want, but the message seeps thru I think.
I have a 3.5 yr old & I don't really have any ideals as such, but I want to avoid him eating candy - not always sucessful, since they see the colorful things everywhere & insist on getting some. however, i dole it out in small portions. i also don't really make a big deal of dessert & hardly ever make it at home. do not give him any juices either - only water & milk. i keep trying to push eggs, cheese, fruits & vegetables, but sometimes it works & sometimes not.
only time will tell what he eats like in future