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No, herbal tea right before fasting blood work is usually not allowed, because herbs, natural sweeteners, or even a squeeze of lemon can change lab values that

No, chewing gum during the fasting period for a sonogram can add air to your stomach and trigger digestion, which can blur belly ultrasound images.

No, drinking plain green tea before fasting blood work usually breaks the fasting rule for most tests, since labs ask for only water for 8–12 hours.

Yes, most plain fruit tea with no sugar or calories is fine during a fasting window, but fruit tea with dried fruit pieces or sweeteners can break a fast.

Yes, you can drink coffee with zero sugar creamer during a fast if it truly has zero calories, but any calories can break a strict fast.

Yes, a tiny splash of milk in coffee during a fast usually keeps weight-loss style fasting on track, but a bigger pour or sweet creamer ends the fast.

Yes, plain brewed coffee during a keto-style fast is usually fine, since black coffee has about 2 calories per cup and little to no carbs that would spike

Yes, black coffee during a water fast is generally allowed, but add-ins like sugar, cream, and sweeteners end the fast.

Yes, plain black coffee during a fast is usually fine for health-style fasting; any add-ins with calories will break the fast.

No, coffee before a fasting blood test isn’t allowed; only plain water keeps fasting labs accurate.