[dandelany]

Yikes. Your symptoms were likely caused by calcium oxalate raphides, little mineral needles present in raw agave (and several other plants). https://en.m.wikipedia.org/wiki/Raphide

[amelius]

Your linked article says at the bottom that these things are also present in spinach, beets and pineapple.

[Laforet]

Most cultivated edible plants have been selected against having too many raphides. Though people can still be sensitive to fresh pineapple and kiwifruit which contains proteases that amplifies the damage done by the oxalate needles.

Wild plants, on the other hand , has not been subject to the same selection process and could easily contain a dangerous amount of oxalate.

[renewiltord]

This has been enlightening. I've sometimes definitely had this feeling when eating some pineapple but not other pineapple. Interesting.

[matheusmoreira]

That's extremely interesting. Nature never ceases to amaze.

[girishso]

May be, but it surely scared the hell out of me.