Sometimes weekends are bad

I love to play video games. In order to keep the games from taking over my life I have yet to buy the XBOX 360. So on weekends I go to my buddies house and play some online Halo 3. Nothing like online gaming to burn develop a thirst. The gamers drink of choice is Mountain Dew, loaded with sugar and caffiene, and of course you need Nacho Cheese Doritos to wash it down. Well its hard to avoid these things when Im hungry and there is nothing else around. So yeah sometimes I give into temptation and eat some of the worst possible stuff around. In the past I these are the points where I would just give up. Mostly I would feel a sense of guilt and helplessnes like I could never change. Or I would feel like I just ruined a weeks worth of working out with one night of indescretion.
Now when I have these slip ups I just get back at it the next day. I keep going and moving forward. Its all I can do until , I eventually have the will power to completely avoid sugar ridden drinks and calorie packed nacho cheesiness. Will that day ever come I dont know. It seems like I develped a taste for junk food, its hard to let it go. But I have also developed a taste for feeling better, and being able to excercise and not feel like dying. So I have to opposing desires. I think I have heard somewhere that if you feed one you starve the other. Well I think If the majority of the time I am making the right choices eventually that side of me will win .