I have never done anything like this before, but I am giving it a shot today. For the past few weeks I have been feeling really heavy and just plain gross. I heard about the pineapple fast on the radio and have read a lot about it. It seems to be fairly good for you, will flush out your system and (strangely) is great for the elasticity of your lungs.
So....on this very grey day of working at home, I will be eating nothing but an entire pineapple and drinking lots of water. If I don't absolutely hate it I may try the recommended 3-10 days next week.