I’ll be back with a link, (I know this isn’t truly ELI5, but it is actually research) but I read a study this week that connects ruminating thoughts with dysfunctional messaging from the enteric nervous system. TBH it was really difficult for this non-scientist to understand so maybe someone can interpret it? Brb
[Highly ruminative individuals with depression exhibit abnormalities in the neural processing of gastric interoception](https://www.psypost.org/2022/11/highly-ruminative-individuals-with-depression-exhibit-abnormalities-in-the-neural-processing-of-gastric-interoception-64337)
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