Is Physical Activity the key to a healthy life ? Alone?

Some think that taking part in physical activity alone can help them reach their fitness goals. Although, I believe that this isn't quite true. Your diet, practically what you eat, is quite important. After all, they do say "you are what you eat!". If you take part in physical activity everyday and continue to not eat healthy, I'm afraid the results that you are hoping for will not satisfy you. I started eating healthy and changing my daily lifestyles (yes, cut down on fast food!). I can already see improvement, both mentally and physically. Dedication and commitment is an important key.