Great for dieting: Fish and chicken first and foremost if you want to not be hungry.
Are you just trying to lose weight or are you wanting to put on some muscle while losing?
If you want to do the muscle rout, chicken and tuna are great as well as things like almonds, peanuts, etc etc.
You need to work out (IE lifting weights) if you go that route.
For just plan losing weight and still eating decent, fish, chicken, salads... cut out the soda and switch to Crystal Light or something if you need a flavored drink. I still drink beers but it's not healthy... certain hard A's are gonna be better if you are a drinker. I personally like low fat shit (milk, mayo, granola bars) just as much as the normal stuff so switch it up if you can handle the taste. Other then that, just keep the calories down below what they were before and exercise as much as possible (running, biking, basketball, swimming, whatever you like to do that makes you sweat) and the pounds will start to fall off.