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Yes, blood donation during a fast is sometimes acceptable, but donate when you can hydrate and follow your center’s screening rules.

Yes, a zero-calorie diet soda doesn’t add calories to a fast, but sweeteners in Diet Coke may nudge hunger or insulin in some people.

Yes, a green juice breaks a fast for fat loss or autophagy; sip water, black coffee, or plain tea during your fasting window.

No, a protein shake breaks a calorie fast; keep shakes for the eating window or training exceptions.

Yes, drinking alcohol breaks an intermittent fast; keep any drinks to the eating window and pair them with food.

No, amla juice breaks an intermittent fasting window; drink it during your eating window or use zero-calorie infusions instead.

No, for fasting blood work you should drink only plain water; coffee, tea, juice, alcohol, and sweeteners can alter results unless your clinician says

Yes, apple cider vinegar can fit most fasting windows when taken plain, diluted, and without sweeteners.

No, a 7-day water fast is unsafe without medical supervision; choose shorter, supervised fasting if appropriate.

No, sweetened 3-in-1 sachets break an intermittent fast because the sugar and creamer add calories.