Family files lawsuit against Panera Bread after college student who drank ‘charged lemonade’ dies
nbcnews.com
Sarah Katz, 21, had a heart condition and was not aware of the drink’s caffeine content, which exceeded that of cans of Red Bull and Monster energy drinks combined, according to a legal filing
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The 30oz size has 390mg caffeine. The FDA says 400mg a day is not generally associated with harmful effects for adults without heart conditions etc. If the FDA says up to 400mg is fine, I don't think it's fair to call that the "danger threshold." That's like calling the speed limit the "danger threshold." It's set there for a reason, but you don't go from "no adverse effects" to "danger" as soon as you cross the line.
It's advertised as having the same amount of caffeine as their coffee. 30oz of coffee is a pretty significant amount. Not typically dangerous, but hardly something you can drink by accident.
390 in a serving versus 400 per day.
That's an entire days worth in one blast.
Most people normally don't drink their caffeine over a 24 hour period. Maybe a couple hours. The half-life of caffeine in the body being about 5 hours, the peak concentration of caffeine won't be that much higher. Note the FDA doesn't say "400mg is safe but only if you don't drink it all at once."