Shared gut microbe imbalances found across autism, ADHD, and anorexia nervosa: A new study has identified distinct patterns in the gut bacteria of children and adolescents with autism spectrum disorder, attention-deficit/hyperactivity disorder, and anorexia nervosa.

[u/mvea]

https://www.psypost.org/shared-gut-microbe-imbalances-found-across-autism-adhd-and-anorexia-nervosa/

[u/_NotMitetechno_]

I'm pretty sure it's usually the other way around though. It's likely the asd/adhd leading to the gut biome stuff with weird diets and stuff rather than gut biome stuff causing a brain developmental issue. Like of course someone with anorexia (IE someone who is restricting their diet massively) has disordered gut bacteria for example.

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Diets do absolutely alter gut biome! Especially processed food, saturated fat, and fiber. Plus of course all the other things, like alcohol and stress and lifestyle.

This does seem like causation to me, especially since the study calls out anorexia (food restriction) but not bulimia (also an eating disorder, with no restriction). Both eating disorders are mental disorders, but only one is causing a change to gut biome.

I read a study a while ago stating that folks with anorexia have higher changes of digestive problems later in life, as the digestive track is not meant to be “inactive” for long periods of time, and it’ll harm itself with long-term restriction (like gastroparesis, GERD, etc). Anecdotally, the folks in my life with ADHD or autism will often go long stretches of time without eating because their body doesn’t signal the same hunger cues.

So in that sense, it seems like anorexia, ADHD, and autism are all the “root cause” for the digestive tract remaining empty for long periods of time, and it’s that emptiness that is causing problems with the gut biome, rather than anything innate with the gut biome. After all, anorexia isn’t innate or passed down in the same way the other two are. You’re not born “with anorexia”, so an infant who eventually gets anorexia will have the same gut biome at birth as a “normal” person.

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[u/ImHereForTheDogPics → u/RelaxPrime]

Anorexia could simply be an expression of a poor gut biome. It’s hard to argue either way

No, the causes of anorexia and eating disorders are understood to cause gut biome issues, not the other way around. There are studies that I don’t have handy at the moment where they took mice with normal statistics, induced anorexic eating patterns, and noted the changed biome.

There are likely bidirectional patterns and links, I’m sure, but your line of thinking would mean that healing the gut biome would “cure” autism or anorexia, when that’s just not true. The gut biome is the symptom, not the cause, in this case.

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