Even mainstream Christianity can only come up with one verse "against" it, the one that says that the body is the temple of the Holy Spirit. But on that basis, eating too much fatty or sugary food is equally sinful.
That's the scripture they use to ban smoking. In fact there's more than one scripture that makes over eating sugary foods unscriptural (if you also include that one)....but then half the GB would have to DF themselves!