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Yes—caffeine can trigger a short-term cortisol rise; no—on its own it doesn’t cause weight gain, though late doses and sugary add-ins can.

No, caffeine doesn’t increase dehydration for regular coffee or tea drinkers; at usual doses it adds fluid despite a mild diuretic effect.

Yes, caffeine increases gut motility for many people by stimulating colon contractions and the gastrocolic reflex, often within 15–30 minutes of a cup.

Caffeine and migraine: high or erratic intake may trigger attacks, while a small, timely dose can help—consistency and limits matter.

No. Current studies in premenopausal women show caffeine doesn’t reliably raise progesterone; findings are mixed and usually minor.

No—typical caffeine intake doesn’t raise prolactin; small trials show brief bumps in special contexts like intense exercise or big doses.

No, typical caffeine intake doesn’t raise PSA levels; current research shows no measurable effect of coffee or tea on PSA test results.

Yes — caffeine can cause a small, brief rise in body temperature, especially during activity or hot weather, but it doesn’t create a fever.

Yes—many tea drinkers add milk to Ceylon black tea to mellow briskness; brew the tea first, then stir in a little milk to taste.

Yes — caffeine can raise cortisol for a short period, with size and duration shaped by dose, timing, and how often you use it.