cleansing is a good thing. it is through gluttony and feeding the desires of the flesh that people get sick. exercising self control is one of the main teachings of christ. that some other religion sees a benefit in this is no surprise. many eatern religions have a lot of spiritual truth in them. what they are missing is context, which is to say jesus. even paul said that paying attention to your physical condition profits a little. it is not prohibited, it actually has benefits. i for one can use all the help i can get.
also, the scriptures talk about WHEN you fast, not IF you fast. can it be any plainer? do we have to be told every little thing to do?