My sister went on the atkins diet, and after a few days, she developed severe kidney infection.
When they rushed her into the hospital, they ran checks on her to try to find out what it was. At first, they were stumped, then when they had done virtually all the tests they coud, the doc asked her if she had been on atkins diet, she told them that she had been on it for about 4 days......
They said that was almost surely the cause of it, they said that they had seen a dramatic increase of people coming in with kidney infections.
The problem with the diet, is that most people are going onto it, without first consulting a GP.