Barsel, If I need to lose weight quickly (without being hungry) and healthily I do this. It minimises your appetite wonderfully.
Drink only water, no tea coffee, fizzy drinks etc excepting small glass of juice before breakfast and with evening meal (diluted if you wish to make a much longer drink). For breakfast 2 x weetabix with something like bannana, berries etc, lunch salad and soup, evening meal large veggie stew. Drink a pint of water 1/2 and hour before each meal. You absolutely won't be hungry, it's all good food and natural and the weight will drop off you. Don't wait for a dietition as Woof says just crack on, you'll be amazed how much better you feel :)