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Yes, Symprove breaks a strict fast because a 70 ml shot contains about 10 calories; many fasters take it right after the fasting window.

Yes—some supplements break a fast, while plain zero-calorie options for fasting usually do not.

Yes—sucralose can interfere with a clean fast by prompting sweet-taste hormonal responses, even though calories are near zero.

Yes—calorie fasts allow sugar-free Torani; for clean fasts aiming at insulin rest or autophagy, avoid sweeteners during the fasting window.

No, sugar-free gum rarely breaks an intermittent fast; strict water-only fasts differ, and any calories can count as breaking the fast.

No—plain Starbucks black coffee stays under ~5 calories, so a basic intermittent fast remains intact.

No, plain silica by itself does not break a fast because it provides no calories or usable energy.

No, Splenda Stevia usually doesn’t break a fast for calories or blood sugar, but strict clean fasts avoid any sweet taste at all.

No, for a fasting thyroid blood test take your daily levothyroxine after the draw unless your clinician told you otherwise.