Both Uses

glutton
in
A Great and Terrible Beauty
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We all know Pippa is a secret glutton.†
Chpt 15 *

glutton = someone who consumes more than they should -- especially eating and drinking too much; or someone who persists in an activity even though it has negative consequences; or someone who loves a thing mentioned
Tom offers cakes and Ann, who has never refused a morsel of food in her life, declines as a well-born, properly bred lady should, lest she seem a glutton.†
Chpt 26

Definitions:

(1) (glutton)
someone who consumes more than they should -- especially eating and drinking too much

The expression: "a glutton for punishment" usually refers to someone who persists in some activity despite negative consequences, but it can also be used to stress that someone loves something as in "a glutton for sunshine".
(2) (meaning too rare to warrant focus)
Gluttony is an instance or a habit of eating or drinking like a glutton.

Much more rarely, glutton can reference a kind of wolverine in northern Eurasia.