How many glasses of coffee per day?
For most adults, the FDA has cited 400 milligrams* a day — that’s about two to three 12-fluid-ounce cups of coffee — as an amount not generally associated with negative effects. However, there is wide variation in both how sensitive people are to the effects of caffeine and how fast they eliminate it from the body. Up to 400 milligrams (mg) of caffeine a day seems safe for most adults. That’s about the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two energy shot drinks. Keep in mind that the caffeine content in drinks varies widely.Moderate amounts of coffee (50-100 mg of caffeine or 5-10 g of coffee powder a day) are well tolerated by a majority of elderly people, who enjoy to meet and chat over a cup of coffee. Excessive amounts of coffee, however, can in many individuals cause very unpleasant, exceptionally even life-threatening side effects.
Can you drink 20 year old coffee beans?
Sealed beans can stay drinkable for up to 6 to 12 months past their date, as long as they were stored in a cool, dry place. Now, if the bag’s been opened, that’s another story. Once air gets in, oxidation speeds up. Ground coffee, in particular, can go stale fast, sometimes in just a few weeks. Hot brewed coffee can stay microbiologically safe in the fridge for up to 42 days, but its flavor starts to noticeably drop off after just 3–4 days.