@kev supposedly it has all sorts of health benefits. We'll see :)
It's probably much better for you to just reduce your calorie intake a bit, but do it permanently. Or even better, exercise.
Aerobic exercising helps you lose excess weight (low intensity burns fat, high burns carbohydrates), it builds muscle and can be crazy fun if you find what's right for you. It's a win-win situation!
I'm sorry to say it but these short lived endeavours are rather pointless. Doing a little your whole life is superior to doing a lot for a short while.
Hope this fasting plans works for you. Though I recommend 21 dates/day diet. Dates have good amount of fiber, no fat and variety of vitamins and minerals.
Dates + water will leave you with no deficiency in terms of nutrition.
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