fast - abstain from eating; "Before the medical exam, you must fast"

fast - abstain from certain foods, as for religious or medical reasons; "Catholics sometimes fast during Lent"

keep off, avoid - refrain from certain foods or beverages; "I keep off drugs"; "During Ramadan, Muslims avoid tobacco during the day"

teetotal - practice teetotalism and abstain from the consuymption of alcoholic beverages