Moron. I road my mountain bike strenously 25km a day (STEEP HILLS) plus did between 30 and 60 MINUTES on my Nordic Track plus did 30 minutes of swimming laps EVERY DAY when I weighed 260 pounds. Lost maybe 1 or 2 pounds after a MONTH OF THAT!!!
Now I have osteoarthritis and can't exercise like that any more, went onto Atkins and lost 50 pounds in 5 months.
Perhaps your case is unusual, but I can tell you for a fact that EXERCISE is the best way to become fitter and healthier - and the best way to lose weight, bar none. This is established over DECADES of research, not just on one or two studies. Notice I did not say FASTEST way to lose weight, because the fastest weight loss is not necessarily the best way to lose weight.
Here's a challenge for you: Go OFF the Atkins diet for 1 month. See how much weight you gain back.
However, if you start a dedicated exercise routine (one that you can maintain) for a year or longer, you will see 50 pounds can be lost over a year and you WILL NOT put on those 50 pounds again so quickly. Your cardiovascular system will be healthier, your immune system stronger, and your skeletal-muscular system improved many times over.