Caffeine overdose accidents are very rare, but not non-existent. In the spring of 2015, during an experiment at the American University of Northumbria, two students ingested a dose of coffee 100 times stronger than expected, or the equivalent of 300 cups of coffee. Hospitalized in serious condition, they managed to recover but lost more than 10 kilos each and suffer from memory problems.
In everyday life, reaching such a large dose of caffeine is more complicated, since the volume of liquid to ingest is considerable. Consume approximately 400 mg of coffee per day, is 3-4 cups, is quite acceptable according to the specialists cited by the American site Health.
The negative effects of overconsumption of caffeine
But if you exceed this dose by much, you risk exposing yourself to the negative effects of poisoning, namely:
- restlessness, nervousness, excitement;
- red face;
- Cardiac arrythmia ;
- tightening of the muscles;
- gastrointestinal disorders;
- thought and speech flow.
The limit not to be exceeded varies depending on the sensitivity and metabolism of each person. Experts warn againstuse of caffeine-based energy drinks, as well as coffee powder, which quickly increase the risk of overdose. The number of medical incidents caused by these products are more important than by the coffee itself, estimates Health.
Excess caffeine associated with increased risk of glaucoma
Consuming a large amount of caffeine every day could triple the risk of glaucoma, at least in predisposed people. This is the conclusion of a scientific study published in the June 2021 edition of the journal Ophthalmology, the first to demonstrate a dietetic-genetic interaction in the occurrence of glaucoma: diet could thus influence the risk of occurrence of this ophthalmic disease.
“Glaucoma patients often ask if they can help protect their sight through lifestyle changes, but this area has been relatively little studied so far. This study suggested that people at the highest genetic risk for glaucoma could benefit from a moderation of their caffeine consumption”, Commented in a communicated Dr Anthony Khawaja, co-author of the study and professor of ophthalmology at University College London (United Kingdom).
In conclusion, you can continue to enjoy the benefits of coffee provided you consume it without excess. But watch out for energy drinks and steer clear of caffeine-based powders, which are not recommended by most nutrition and health experts.