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i can state from 1st hand experience that it takes longer than 9 days to fuck up the metabolism to the point potter mentions. it's all based on body fat at the time, i went on my psmf diet, which i wrote about here, which is ~1200 cals/day and it took me 2 weeks+ to get to that point, and that was starting with 10% bf. it's even longer if you have more bf- a lot longer. lyle mcdonald even states that if the dieter is obese or close to it, it could take months of ultra low cal dieting to make the shift to muscle degradation. i can tell you this as well, you will look like total shit after a diet like this, don't expect to be impressed with your abs afterwards.
next, coming off an extreme short term program does create a unique set of issues, primarily having the gusto to exercise with enough vigor that the food you eat does not go directly to fat stores. it can be done.
i don't have a problem with super short term dieting such as this, from what i understand, there is little long term risk associated with it. + i find it's a good motivator, the quicker some people see results the more inclined they are to continue.
but nutritionally, these sorts of short term diets leave a lot on the table, i would make sure i am supplementing with micronutrients.
and most importantly, fish oil/omega 3 is absolutely required on a diet like this for several very important reasons.
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