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![JohnLeFevre Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::27434900.png) John LeFevre [@JohnLeFevre](/creator/twitter/JohnLeFevre) on x 180.1K followers
Created: 2025-07-22 13:30:00 UTC

Side-effects of inbreeding:

- birth defects
- developmental and intellectual disabilities
- lower IQ
- increased risk of mental health disorders, schizophrenia, and bipolar disorder
- aggression / propensity for violence

Chart: @jonatanpallesen

![](https://pbs.twimg.com/media/GwdwQP2XwAEkjcq.jpg)

XXXXXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1947650336061059473/c:line.svg)

[Post Link](https://x.com/JohnLeFevre/status/1947650336061059473)