What You Shouldn’t Drink While Fasting
Anything with calories in it is off limits, because it will break your fast. This includes all soda and juices. The only exception to this rule is if you’re following a controlled fast, such as in the Warrior Diet or the 5:2 Diet, where fresh fruit and vegetable juices are permitted in moderation.
What you shouldn’t drink when fasting includes the following:
Alcohol: Alcohol is quite calorically dense, so stay away from it.
Any diet beverages: They include soda, tea, and other similar drinks that contain artificial sweeteners, including aspartame, Splenda, and stevia.
Juice: During a strict fast (such as intermittent fasting), juicing isn’t allowed. But if you’re following a controlled fast, such as the 5:2 Diet or the Warrior Diet, then fresh vegetable and fruit juices are allowed, such as carrot and ginger juice.
Sugar- and/or cream-laden coffee or tea: Anything with calories in it will tax your digestive system and sabotage a strict fast. Avoid any such additives to your coffee or tea.