Working my b..tt off but still gaining..how can this be-

Hi guysI have started moving and fast walking an hour everyday to stop the weight gain. As of last week my weight gain was 4 pounds coming into the 4th week . The last week I have been walking and really watching what I eat. I am Mediteranian so our food is pretty healthy and light. Even then this past week with all that walking around and eating careful (no junk food) I gained a pound. I am 32 days into my quit and total gain is 5.5 pounds..Can somebody explain this to me? I know my metabolism slowed down but I am eating less and healthy and walking everyday and I am still gaining weight!! Grrrrrrrrrrrrrrr!!! When do things start turning into normal? again..DO I have to starve myself to stop myself from gaining weight???LoveSonata