I know what he's talking about. Run Martin! Run like hell!
I tried it earlier this summer, and it was the biggest waste of health I've ever experienced.
You eat nothing for ten days, except for a concoction of water, lemon juice and maple syrup (not unpleasant, that concoction) and guzzle salt water in the morning, and drink laxative tea at night. The idea is to flush everything out of your body. You know, poo...chemicals..."toxins."
But really all you do is lose all your water weight and become a space case from the drop in blood sugar. And then you probably get the flu. "But it's the toxins leaving your body!" someone with a beard might say. Nope, your immune system is shot from having nothing to run on.
Please don't do this to yourself.