Hi @chloroform, thanks for stopping by.

Roughly, the amount of caffeine when ingested capable of leading to death is calculated as 300mg per kilogram the consumer's weight, this quantity is referred to as the lethal dosage of caffeine. Hence to kill an 80 kg man, you would be requiring 24g of caffeine.

Howbeit, medical professionals warn against exceeding a daily dosage of 300mg of coffee. This equivates to 4 cup of coffee.

Although not reaching the lethal dosage, there are other contents of the food or beverage capable of causing death. One could experience a shock from high sugar rush.

Apart from not exceeding a specific amount of caffeine, one should take it at intervals.

Thank answers your questions!