I eat right and make sure to make exercise out of everyday activities. I take the stairs whenever possible, I get off the bus a couple stops earlier than I need to, and I park far away at the parking lot. I also use an indoor recumbent exercise bike when I can and get out on the road on my regular bike when the weather is nice.
My diet has a fair amount of fruit and vegetables, mostly beef for meat, and like everyone, I eat junkfood occasionally. But I refuse to jump on any fad diet that comes along because it's simply idiotic. Just eat RIGHT, and keep MOVING, and your fitness goals will fall into place.
I'm 19 years old and I'm 5'9, 125-130 lbs. depending on the season and my digestive system.