Coffee

The FDA and EFSA both cap safe caffeine at 400 mg a day and about 200 mg per sitting. But the number that really limits your day is bedtime: a five-hour half-life means afternoon caffeine is still ...

For most healthy men, coffee on an empty stomach is fine: no ulcer link, no significant reflux link. What it does change is intensity: faster caffeine absorption, a sharper cortisol response, and a...

Coffee making you tired is not one problem but four: the adenosine rebound, the sugar crash, the withdrawal loop and the sleep debt caffeine creates. Here is how to tell which crash is yours and th...