Water fasting

[Shlup]

Just because something is "ancient" or has been used "historically" doesn't necessarily make it a good thing nor does it make it scientifically sound.

This. I mean, ancient Egyptians used to stuff their vaginas with crocodile crap as birth control, but I doubt you're going to be trying that next.

But, like Miriel said, fasting can feel good and can be a nice kick in the butt. It's not good for weight loss in and of itself, but the kick in the butt can be nice. I would find a water-only fast torture though.