I lost about 23 pounds my first month of South Beach, 13 in the first 14 days. I did not exercise, couldn't due to serious issues with my heart and blood pressure. I did however do deep breathing exercises, about 10 minutes several times a day.
I had a very high BMI so I did have a lot of weight that needed to come off. I did not cheat once, being I was so scared of having a heart attack! I love South Beach because it happened to be the plan that works for me, but also because I am able to make this my lifestyle. No sugar and not BAD carbs. I love veggies so South Beach wasn't that far a stretch for me. I just had to really apply what I already knew. Plus a lot of learning along the journey. I am now 50+ pounds down, 5 months later and loving the results thus far.
I agree with making it healthy though..if you do something harsh just to drop quick pounds, then gain it right back anyway...you're doing more long term harm to your body.
Best wishes to you!
"Nothing taste as good as thin feels"