It's a complex topic, and I'm no expert. But based on all of the contradictory studies out there, I don't think it's quite as simple as you're making it sound.

For example, a new study done in Sweden was in the press recently which sounds to run counter to the ones you've linked to.

http://www.dailymail.co.uk/health/article-2157532/Atkins-die...

http://www.theatlantic.com/health/archive/2012/06/time-to-re...