![]() Nicotine for instance causes a higher heart frequency by having the coronar (heart) arteries contracting, thus signalling a lower level of nutrition to the heart muscle, which in turn increases its frequency to compensate.Ĭaffeine is a stimulant to the nervous system and increases the blood pressure by causing the injection of adrenaline, which in turn increases breath and heart frequency, thus bettering the nutrition of the body and making you feel awake and alert.īut caffeine is not the single ingredient of coffee. Don't try doing your own experiments.Īs far as I know (I am not a physician ), higher blood pressure is caused by contracting of the arteries or by a high level of electrolytes or by an increase of the heart frequency. But that's another story entierly.ĭrugs affect different people in different ways. ![]() Even if you were drinking a cup every 5 minutes, the blood level would stabalize around 7.2g - in the danger zone but still likely survivable especially with medical attention.Ĭaffeine is a dierettic (makes you pee) and so your biggest risk would likely be dehydration. Assuming the 100 cups were spaced evenly throughout the 24 hour period (one each 14.4 minutes), we can calculate the total caffeine in the bloodstream at any time durring the 24 hour period.Īt one cup every 15 minutes, the level of caffeine reaches an equilibrium with the rate of degredation arround cup #70 with a blood level of 2.4g - much less than the LD50 of 13.4g. Since the metabolic half life of caffeine is 4 hours, this problem becomes a little more complicated. The question posed was whether 100 cups in 24 hours would be fatal. Since the standard cup of drip coffee has 150 mg of caffeine (a shot of espresso has substantially LESS) a 70kg individual would have to ingest 89.6 cups in once sitting to reach the 50% survival dose.Ĩ9.6 cups is a lot of volume so it is unlikely that one could drink that much at once. Meaning that a 70kg (150lbs) person who ingests 13.44g of pure caffeine has a 50% chance of survival. The LD50 (leathal dose, 50% occurance) of caffeine administered oraly in humans is 192 mg/kg.
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