Science

Drink a coffee, nap 20 minutes, wake up sharper than either would leave you. The coffee nap sounds like a myth — sleep labs say otherwise.

That afternoon cup may still be in your system at bedtime. Here's how long caffeine actually lasts — and how to time your coffee for better sleep.

A single espresso shot has less caffeine than a mug of drip — but the math isn't what most people think. Here's what's really in your cup.

Black coffee, splash of milk, or a bulletproof brew — which ones actually break your fast? Here's what the science says about coffee and intermittent fasting.

Does coffee dehydrate you? The science says no for normal intake — here's why caffeine's diuretic reputation is mostly a myth.

That first-thing-in-the-morning cup hits different — but is it doing your stomach any favors? Here's what the science actually says about coffee before breakfast.

Caffeine doesn't create energy — it blocks the signal telling your brain you're tired. Here's exactly how it works, from first sip to crash.

Transform your morning coffee into a muscle-building powerhouse with these protein coffee recipes and timing strategies.

Mushroom coffee is everywhere right now — but what actually is it, and does it live up to the hype? Here's what you need to know before you try it.