I lost 30 lbs in 6 weeks a few years ago on Atkins. The first week or so, it's mainly water weight (carby foods hold a lot of water in your system).
The downside is the weight eventually comes back when you reintroduce carbs - you can't stay away from them forever. Also, my cholesterol and BP went way up, despite the weight loss. Yes, I was eating a ton of salads, low-sugar veggies and limiting red meat intake.
It probably effects people differently, but the negatives outweigh the positives for me. Now, I just watch the super-starchy carbs, limit my caloric intake and exercise.
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