abstemious — practicing self-restraint, especially in eating and drinking; moderate in indulgence

a well-dressed person sits at a table filled with elaborate dishes and wine glasses, carefully selecting only small portions. They politely decline a waiter's offer of more wine by covering their glass with their hand. While other guests around the table indulge heavily in rich foods and multiple drinks, this person maintains careful moderation. The restrained diner appears content and composed despite the abundance surrounding them. Other party guests eat heartily and drink freely, creating a clear contrast in behavior. someone practicing self-restraint and moderation in eating and drinking despite abundant temptation