Healthwise, it's typically recommended that you only drop about 2 lbs. a week, so 8 lbs. a month. I'd be suspicious of any diet that claims that people can drop up to 20 lbs. in a month. Even after reading their website, I'd say that this is a diet for only the morbidly obese. If your wife is looking to drop a few pounds, this isn't the way to go.
Additionally, it can be really hard over the long term to keep weight off if the weight loss is sudden.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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