Diet Tips

I am kind of restricted from exercise due to my job. I am a truck driver so i cannot make it to a gym. So what I am asking if anyone has found a diet that works and that is not a "Fad" diet. I would like to lose about fifty pounds. My diet now consists of mainly salads, water, and diet soda. But the problem as stated as before is lack of time to exercise. The diet that i am looking for would be something that would boost my matabolism that way in tuen i would lose wieght. Thanks for any suggestions