Grazing / 3 meals question ?

I have read that if you eat small and often it speeds up metabolism ...  So why are we told to eat 3 meals a day ?  If the calorific value of grazing and 3 meals is the same ,shouldnt we stll lose weight ? not that it makes any difference to me ,I am 9 months out and stopped losing weight 2 months ago,even though I had the runs for over  a month I still didnt drop a pound  :( Oh I hope I can have the StomaphyX or DS even anything to get this weight off :( Susie x