How old is he?
Have you checked his teeth?
What type of bedding/litter? (In case of ingestion, leading to impaction)
Has he been to the vet recently?
Has he been treated for something recently?
What is his temperature/light schedule?
currently i am feeding him Iams cat food and haven brought him to a vet recently.but recently have been moving him from her house to my house and back to her she agn cause she went on a holiday......does moving him up and dwn affect his diet n stuff?