Once you really realize the effect that stuff like that (pop, fried foods, sugary drinks, etc.) has on your body, and you wean yourself off of them cold turkey, after a while, they don't sound that good. Don't get me wrong, I still love pop, but drinking it frequently makes me feel like crap.
Another thing to consider for those of you who are struggling to lose weight is some sort of a detox regimen. 3 summers ago, I got a job selling a product called Diatomaceous Earth. Check it out:
http://www.earthworkshealth.com/ It's a great product, it's completely chemical-free, and it's cheap. All you do is mix less than a tablespoon of this stuff in a drink, and it will pull a lot of the crud off the walls of your digestive system. I never quite grasped how unhealthy my diet was until I started using it.