According to WP, carrots contain 5g/kg of oxalic acid, and LD50 of oxalic acid is 600mg/kg (30g for a 50kg person). This seems...odd.
Indeed challenging, but uncomfortably close to plausible. Not sure if 3kg of spinach is more or less plausible.
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Also that 600mg/kg is an LD_{Lo}, not an LD50. Given its toxicity is due to precipitating out in the kidney & thus being nephrotoxic, I'd imagine there to be a wide variation in toxic doses among people.
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Oh, I misread that Lo as 50 due to small text. That makes a lot more sense. And yeah the mechanism is fairly un-scary.
End of conversation
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