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No, pure vitamin c powder without sweeteners does not break a fast; mixes with calories or carbs do.

Yes—vaping can break a water fast because a true water fast allows only water, while vapor adds substances like PG, VG, nicotine, and flavors.

No, vaping adds virtually no calories to a fast, but nicotine and flavors can nudge insulin and appetite in ways that change your fasting goals.

No, waterdrop with zero calories usually won’t break a weight-loss fast, but sweeteners can affect strict autophagy or insulin-sensitive fasts.

Whitening strips usually don’t break an intermittent fast, but religious fasts can be broken if gel is swallowed.

No, waxing doesn’t break a fast—hair removal stays external and doesn’t involve eating, drinking, or sexual activity.

No, tea with Splenda usually keeps a fast intact for fat loss, though sucralose may raise insulin in some people.

No, most ct scans don’t require fasting; many contrast exams ask for 2–6 hours, and your site’s instructions rule.

No, most MRI scans do not require fasting, but certain abdominal studies or sedation/contrast protocols may ask for a short fast.

No, chest ultrasound exams don’t require fasting; only tests like TEE or abdominal ultrasound have diet restrictions.