In the third book he's living on wine and bread, which is widely taken to signify Communion. So maybe you could eke in that he's sorta-kinda drinking blood?
Didn't the verb "banting" get named after a Mr. Banting? Perhaps the process of slimming (or whatever he's doing) via a bread-and-wine diet can become known as "fisherk-ing," emphasis on the "sherk."
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