What is the maximum amount of Caffeine a person can have in a 24 hour period?

Question

For a healthy adult?

Answer 1

The current recommendations regarding caffeine are three cups of coffee or tea per day or less. Whenever a person tells me, he or she drinks more than three cups per day, I recommend a gradual reduction in coffee or tea drinking to three cups. An immediate switch to the same amount of decaffeinated coffee or tea will produce symptoms of caffeine withdrawal (irritability, headache and inability to work effectively, nervousness, restlessness and tiredness). If you currently drink more than three cups, cut down by one cup per day every three or four days until you are down to three cups per day. This will help reduce the symptoms of caffeine withdrawal. While you are cutting down, you can replace one cup of caffeine-containing coffee for one cup of decaffeinated coffee. Sometimes, it is hard to keep track of how many cups of coffee you drink per day. Limit yourself to one cup of caffeine-containing coffee per meal. If you want more coffee, switch to decafe. Also, try to avoid drinking all three caffeinated cups at the same time.

Answer 2

It is estimated that fatal doses for humans are between 3 and 20 grams of caffeine taken orally, depending on body weight and tolerance.

In rats, 50% died (LD50) were killed at a dose of 192 mg/kg

Leson CL, McGuigan MA, Bryson SM. Caffeine overdose in an adolescent male. J Toxicol Clin Toxicol. 1988;26(5-6):407-15.
Non-Fatal. 16 yr old male ingested estimated 6-8grams caffeine and survived with hospital care.

Answer 3

There is no real "max" each body can handle caffeine differently.

I don't suggest to much caffeine, it is a addictive drug.

Try to keep it under three cups of coffee a day, I read in my Bio class, that after that amount of coffee the natural insecticide(caffeine) starts to build and do harm.

Answer 4

i dont think i wanna know. lol. i drink about 10 cans of mountain dew a day along with about 2 cappicinos and 1 energy drink. i think im immune to caffeine cause i can still fall asleep easy at night with all of that in my system