I think gluttony can refer to any pleasure of the senses when that pleasure is preferred to the exclusion of duty to God, duty to family, duty to one’s neighbor, and damage to one’s own physical, mental or spiritual health. I think an undue “pickiness” to the degree that it causes pain or harm to self or others is also wrong and comes under this sin. For instance, anorexia or bulemia, assuming the person has full free will to choose such actions, could be sinful. I am thinking also of the mother of Screwtape’s victim who plagued others by refusing food that was served because it was too much, too rich, asking instead for a perfectly boiled egg instead of the steak, then rejecting it because it was not properly prepared.
someone who inconveniences every one else at work or in the home because the temperature is always too hot or too cold, and makes herself a nuisance with the heat or A/C.
someone who not necessarily eats too much, but always has to have the first piece, the biggest piece, the piece with the flower on it, the perfect piece. I think of a cousin who could not see a box of chocolates without testing most of the pieces by taking a small bite out, then putting the ones back she didn’t like.
Another instance would be a spiritual gluttony, an example used by a priest on a reteat once. He used the example of a person who is constantly driving around to healing services every night of the week, or driving around to look at all the “Mary on a tortilla” or “Christ on a tree trunk” sightings, seeking out so-called visionaries and locutionists, church hopping to find emotional experiences rather than for true worship. Someone who multiplies ministries, devotions, pious practices, for the pleasure and satisfaction they get, not from true love of Christ and not from devotion or desire to grow in holiness and humilty.