Restraint

noun a person who abstains, especially from indulgence in alcoholic beverages; a teetotaler

• The abstainer refused to partake in the wine tasting event.
• She's always been an abstainer when it comes to alcohol.
• He's a total abstainer when it comes to junk food.
• Being an abstainer from social media, she enjoyed a more peaceful and focused life.

noun the practice of restraining oneself from indulging in something, especially alcohol or sex

• Medical professionals often recommend abstinence from alcohol during pregnancy.
• I'm practicing abstinence from junk food this month to improve my health.
• I'm on an abstinence kick right now, trying to detox from all the partying.
• His abstinence from social media was a refreshing change, allowing him to focus on more meaningful activities.