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No, tea isn’t allowed before fasting blood tests; drink only water unless your clinician says the test is non-fasting.

Yes, plain tea and black coffee during a fasting window are fine; calories, creamers, and sweeteners end the fast.

Yes, plain tea fits a fasting window; a tiny lemon squeeze adds ~1 kcal and suits most approaches, but strict zero-cal fasts leave it out.

Yes, having tea while breastfeeding is fine in moderation—keep caffeine near 200–300 mg daily and avoid troublesome herbs.

No—before fasting lab work, stick to plain water; tea, even unsweetened, can shift certain blood results.

Yes—plain unsweet tea fits keto because brewed tea has ~0 grams of net carbs; add-ins can change that.

No, milk tea during intermittent fasting breaks the fast unless it’s plain tea with no milk or sweeteners.

Yes, regular brewed coffee fits ketogenic eating; the carbs come from what you add to the cup, not the coffee itself.

Yes, tea with sugar is fine on a clear-liquid colonoscopy prep; skip milk or creamer and avoid red or purple dyes.

Yes—after early healing, small diluted orange juice is usually fine, but skip it for the first weeks after sleeve gastrectomy.