How do I get my 4-yr old to eat his dinner?

My 4-yr old stepson has really bad eating habits and sometimes at dinner, if something is given to him that he doesn't want (i.e. vegetables, something new, etc) he will sit there and refuse to touch it. He is perfectly fine with going to bed without dinner because he knows the next day that he'll once again get the foods that he does want to eat. He is overweight for his age and I want him to get more balance into his diet before the weight problem gets worse, and I also don't want to constantly give in to a 4-yr old's stubbornness.