Are DIY plastic body wraps safe?

My friend uses Pinterest as her bible and tries out a lot of the stuff in it and recently found a DIY body wrap. A part of your body that you wish to slim down is wrapped in plastic with some oils and vitamin E. I looked into it and it works by removing the water from your body. I really do not approve of this so if someone specialized could either approve or disprove of my opinion about this I'd greatly appreciate it.

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