Govern well thy appetite, lest Sin Surprise thee, and her black attendant Death.

Keen appetite And quick digestion wait on you and yours.

'Tis not the meat, but 'tis the appetite Makes eating a delight

My forces are not enfeebled, I find no decay in my strength; my provisions are not cut off, I find no abhorring in mine appetite; my counsels are not corrupted nor infatuated, I find no false apprehensions to work upon mine understanding; and yet they see that invisibly, and I feel that insensibly, the disease prevails.

San Diego has always had a champagne appetite and a beer budget,

There doesn't seem to be any medical reason for it. He just seemed to lose his appetite.