Master Cleaser/Lemondade Diet and metabolism decrease

I'm curious, does fasting on The Master Cleanser decrease your metabolic rate? My understanding, from working out and readig fitness books and magazines, is that you should eat several small meals daily to keeping your metabolism going strong. "Experts" say that fasting isn't healthy for weightloss because as soon as you begin eating you gain whatever weight you loss plus more due to the decrease in your metabolism. Does anyone have advice or information relating to/differing from this?