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Yes, excess caffeine can strain kidneys in certain people, while moderate intake is generally safe for most adults.

No—caffeine doesn’t cause thyroid disease, but excess intake can aggravate symptoms and hinder levothyroxine absorption.

Yes, too much coffee can trigger chronic diarrhea in susceptible people by speeding colon activity and irritating the gut.

No, coffee itself doesn’t cause diabetes; sugary coffee drinks and sleep loss can raise risk while caffeine may spike blood sugar short term.

No—too much caffeine doesn’t cause sleep apnea, but late or heavy caffeine can worsen sleep and daytime symptoms.

Caffeine can nudge calorie burn and blunt appetite short term, but lasting weight loss needs diet and activity changes.

Yes, too much caffeine can give you heart palpitations by overstimulating your heart’s electrical system.

Too much caffeine may leave skin looking dull and tight by nudging fluid loss and sleep disruption, but smart habits keep skin hydrated.

Yes, too much caffeine can cause nausea by irritating the stomach and speeding gut activity, especially at higher doses or in sensitive people.

No, too much caffeine doesn’t cause alcohol-type intoxication, but high doses can mimic a tipsy buzz and muddle judgment.