Welcome, John!
Tracy had a good piece of advice -- try hanging on to your old habits for one more week (or if you find you can't stand it, three days or so), but be totally aware of everything you eat. Write it all down with amounts. If you're really good at keeping up, write how you feel 30mins-1hr after eating. You'll probably start to notice trends in how you feel after you eat certain things, like high-sugar or generally high-carb. If you start comparing your portion sizes to the recommended portion sizes you'll make BIG progress just in getting your head around this healthy thing!!
Another approach is to pick one thing you eat regularly that you know you shouldn't and eliminate it. Just pick one thing and don't even think twice. If you normally have a can of soda with lunch, decide to have water instead. That alone will cut out 200 cals or more (depending on the size of the can/bottle)!
Anyway, good luck! We're here for you. There's a wealth of information here, I hope you take advantage of it! And if you have any questions, you know where to find us....


to the 20-somethings board! I have tried never to think of this as a "diet" but rather a lifestyle change. It's not something I begin and end, rather something I began eight years ago and have continued for my well-being throughout life. This has helped me make little changes rather than just try to make one big one. 