I agree with what Eddie said, but I'll add a few things. Even if everything was perfect at his old home and in his new home, the stress of moving and acclimating to the new home could put him off food for a little while. A lot of people suggest waiting a week after bringing a new BP home before offering it food for that reason.

Also, if he refuses, do not continue to offer food. That can be a source of stress too. Offering one time every 5-7 days will be enough.