A Lynchburg man, who saw the movie "Super Size Me," decided to go on an all-McDonald's diet of his own. However, he's trying to keep the pounds off with exercise in the hope of proving that obesity is caused from a lack of activity, instead of fat intake.

A personal trainer in Staunton says exercise is good, though with so many people on the run, eating healthy is also essential.

"Obviously it's better to work it off than to not work it off, but yeah, I don't think it's a good idea," says Caleb Moore, a personal trainer.

Moore wouldn't suggest an all-McDonald's diet. He says a high number of calories and high sodium won't keep you in shape.

"Cholesterol too. You have to worry about your heart, and overall I think you may see minimal results with working out," says Moore.

However, McDonald's is a hot spot. During a 30 minute lunch break, fast food is often the quickest choice, but Moore says, it's not always the smartest.

He says, "Plan your meals throughout the week so you have them prepared so when you are in a time crunch, you have something prepared that's healthy, as opposed to having to rush out and get the quick fix at lunch break."

If you want to stay healthy and stay in shape, Moore says to eat more proteins, chickens, seafood, and steamed vegetables. If you have a craving for fast food, just eat in moderation.

He says, "The working out part is part of it, but if you're not eating the right foods and your not getting the right nutritional value and diet, it's not going to work."

Aside from eating nothing but McDonald's, the man exercised for about ten hours a week. Results are not yet available, though they will be revealed in a new movie, "Super Size Me Too," which premieres on February 2.