That's because people don't do it right. If you actually read his book you'd see that he only advises cutting NET carbohydrates (carbohydrates that are left after subtracting fiber from the total amount) strictly for 2 weeks to basically break the body's dependence on them for energy so that you are burning fat and calories instead, and then to add them back until you are at a reasonable level balanced with protein. Everyone's ideal level is different, dependent on lifestyle, age, activity level, and gender. You are only supposed to eat higher protein during the time period that you have cut the carbohydrates low.
Most people don't really read the details about things like Atkin's or South Beach, but that is why they are BOOKS and not a single page. No one tells people to simply go cut out all carbohydrates and eat high protein as a long-term diet.
This Q&A article addresses some of what I mean as well as some common misconceptions: http://well.blogs.nytimes.com/2010/0...-carb-dieters/
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