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Caffeine can be effectively used instead of adderall for concentration
(www.wyomingpublicmedia.org)
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400mg is the upper limit of what a healthy adult should consume in a 4hr period. I can easily crush a Trenta Pink Drink from Starbucks in like, 25mins if I'm thirsty. But not all adults are healthy, in fact, most aren't. If you read my linked article, those drinks alone can cause caffeine toxicity in really short order. Especially for people using Panera to telework or study in a place with decent food, wifi, and free refills who just keep going back for more, unknowing of the danger they're putting themselves in.
It's insidious too, because while stimmed up on caffeine, they'll find they 'work better' when they're in a Panera, thus creating the wholly intentional feedback loop of wanting to work/study there more often.
Hmm that's a good point, however the article you linked said that they are unlikely to be lethal even if probably unsafe for part of the population. It is essentially an energy drink and should be seen as such
The study I posted in my initial comment notes how easy it is to reach near lethal levels for a healthy adult (second article, as well as myself, notes that most folks aren't healthy) with the current trend of supplements, powders, and additives in other foods. Other studies have noted that high/toxic levels of caffeine can and does lead to varying types of death, including suicide, but also major cardiovascular issues.
We don't take it seriously enough, but we've always done this. Used to put cocaine in cola too. Regulations just haven't caught up with it yet.