What Breaks a Fast? A Clear Guide to Drinks and Foods

“Does this break my fast?” The honest answer depends on why you’re fasting — but for the everyday goal of a simple eating window, here’s a clear, practical guide.

Almost certainly fine

• Water, still or sparkling
• Black coffee (unsweetened, no milk)
• Plain tea — black, green, herbal
• A pinch of salt or plain electrolytes with no sugar

Almost certainly breaks a fast

• Anything with sugar — soft drinks, juice, sweetened coffee
• Milk, cream and milk alternatives
• Snacks, however small
• Smoothies and ‘just a bite’ of anything

The grey areas

Some things sit in between and depend on how strict you are.

• Zero-calorie sweeteners & diet drinks — no calories, but some people find they trigger cravings
• Chewing gum — tiny calorie count; usually fine in moderation
• Supplements & medications — most are fine, but oil-based capsules and gummies can add calories; never stop prescribed medication to fast — ask your doctor

The simplest rule of all

If it has calories, assume it breaks your fast. If it doesn’t, you’re almost always fine. Keep the fasting window to water, black coffee and tea and you’ll never have to wonder. Track the window with our free fasting timer.