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Yes, some vitamins can break a water fast through calories or sweeteners; plain, zero-cal tablets often don’t.

Yes, running consistently can make you faster by building aerobic fitness, leg strength, and better running economy over time.

Most tablets add close to zero energy, so they often don’t break a fast, yet sweetened forms and timing rules can change the call.

Yes, smoking breaks most fasts, and it can derail a health fast even when calories aren’t the rule.

Yes, tracking calories during intermittent fasting can help, but simple portions often work better than logging every bite.

Most fasts mean zero calories, so stick to water, plain tea, or black coffee unless your fasting plan or medical instructions allow food.

Breakfast during intermittent fasting is fine if it falls in your eating window; outside the window, stick to water, black coffee, or plain tea.

A true water fast means no food; you drink water only, and you stop if you feel faint, confused, or unwell.

Some carnivore eaters fast, but plenty don’t; the right call depends on your goals, appetite, sleep, and meds.

Yes, you can maintain intermittent fasting while traveling by anchoring an eating window to local time and packing simple break-fast options.