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the main claim of the authors is Lithium contamination causing obesity, their hypothesis is that sticking to potatoes can avoid that somehow

Do they discuss that elsewhere? I didn't see Lithium mentioned once in the linked article

The series of articles called A Chemical Hunger is where they discuss this and go over a variety of ideas around obesity, the series starts here and it's very long: https://slimemoldtimemold.com/2021/07/07/a-chemical-hunger-p...