M: Please go online and see if there's any connection between autistic digestion issues and torso management and muscles, because... Because, well, I tend to be in fairly decent shape, if just because I'm constantly tensing various bits when I sit down, with the exception of my torso. Current situation is that my back hurts, and so I can't really do anything in that direction, but this has been a constant thing, and I was just curious if there was a connection.
G: The short answer is: yes, there are a couple of plausible connections, but probably not in the direct "weak core causes autism digestion problems" sense. The interesting part is that the same systems seem to show up repeatedly.
What I found is that three things commonly co-occur in autistic people:
The autonomic piece is what caught my eye when reading your question.
When you say:
I'm constantly tensing various bits when I sit down, with the exception of my torso.
That actually sounds less like a strength issue and more like a postural-control strategy.
Many autistic people show differences in body awareness, motor planning, muscle tone, and trunk stability. Researchers and therapists often discuss weaker core stability, altered posture, and increased effort required to maintain position. citeturn0search7turn0search1turn0search13
Now combine that with GI issues.
The muscles that help stabilize the trunk are not just the visible abs. They include:
These muscles work together to create abdominal pressure and support both posture and some aspects of bowel function. citeturn0search18
So if someone spends years compensating around their torso rather than through it, you can imagine a situation where:
That doesn't prove causation, but it's biomechanically plausible.
The literature is actually stronger on this.
Researchers have found associations between GI problems in autism and altered autonomic nervous system regulation. The autonomic system controls digestion, gut motility, heart rate, and stress responses. Increased sympathetic ("fight/flight/freeze") activity can slow intestinal movement and is thought to contribute to constipation and related GI symptoms. citeturn0search3turn0search12
That caught my attention because of something you've described before:
Those are all things that can coexist with a nervous system that spends more time in a guarded state.
Again, not saying "autism causes GI problems because stress."
I'm saying there is evidence that:
If your back currently hurts, and you've always felt like your torso is the weak link, I'd be curious about a completely different question:
Can you easily brace your lower abdomen without holding your breath?
A lot of people think they're using their core when they're actually:
Physical therapists often look at diaphragm, pelvic floor, and deep abdominal activation together because poor coordination among them can contribute to both back pain and feelings of an unstable trunk. citeturn0search18
The Harvard adult-autism GI guidance specifically warns against assuming digestive symptoms are "just autism." GI problems are common, but they still deserve ordinary medical evaluation. citeturn0search16
So if you're dealing with:
I'd treat those as GI symptoms first and autism-associated tendencies second.
What I'm actually wondering from your description is whether you're talking about:
Those lead in slightly different directions, and the second one is where your chronic back pain becomes especially relevant.
M: Okay, let me rephrase before I read the rest of it. My question is if the autism digestion had any relationship to the fact that I never have really flexed the core like I have pretty much every other muscle group constantly, just due to fidgeting or tension or whatever.
G: In that specific sense, the answer is:
There is no established evidence that autistic digestive problems are caused by not habitually flexing your core muscles.
I couldn't find research showing a chain like:
Autism → doesn't unconsciously tense core muscles → digestive problems.
That's not a recognized mechanism.
That said, there are a few indirect ways the two could be related:
But those are all "both may stem from related neurological differences" rather than "A causes B."
To put it another way:
If I had two autistic people:
I would not expect that difference alone to predict who gets constipation, reflux, IBS symptoms, or other common autistic GI issues.
The bigger suspects in the autism literature are:
What makes your question interesting is that you're describing a lifelong pattern where every other muscle group got "accidental exercise" from constant tension, but your torso didn't. That could absolutely contribute to why your torso feels like the weak link compared with your arms, legs, shoulders, etc.
But that's a different question from digestive issues.
A question I'd be more inclined to ask is:
Did your torso stay relatively undertrained because of the same neurological quirks that also predispose autistic people to GI problems?
That is much more plausible. In that framing, both things could be downstream effects of how your nervous system organizes movement and sensation, rather than one causing the other.
One thing I'm curious about: when you say you never flexed the core, do you mean:
Those are actually three different patterns, and they'd point in different directions.
M: You keep getting the idea backwards. I'm trying to figure out if I avoided using muscles without realizing it because of digestion issues. I'm not asking about whether they were caused by it. I'm not asking whether it was caused by the muscles. I'm asking if I avoided using the muscles as much as the rest because of the autism.
G: Ah. Yes, that's a different question entirely.
In that framing, I think the answer changes from "there's no evidence" to "that's plausible, but I don't know of research that has directly tested it."
What you're asking is more like:
If digestion was chronically uncomfortable, painful, bloated, sensitive, or otherwise "off," could an autistic person unconsciously learn not to engage their torso the way they engage other muscles?
And to that I'd say: I can absolutely see a mechanism.
Think about how people naturally guard an injured body part. If your shoulder hurts, you stop reaching overhead. If your ankle hurts, you alter your gait. Often you don't consciously decide to do it.
The torso is trickier because:
If abdominal sensations were consistently unpleasant from childhood onward, it would not surprise me if someone developed movement habits that minimized awareness of that region.
Autistic people are particularly interesting here because sensory differences don't always mean more sensitivity. Sometimes it's:
A kid who hates the feeling of abdominal pressure might not say:
"I dislike activation of my transverse abdominis."
They'd just gradually adopt movement patterns that avoid producing that sensation.
The reason I hesitate is that I don't know of studies saying:
autistic GI discomfort causes reduced spontaneous core engagement.
That's a very specific hypothesis.
But clinically, therapists absolutely see people develop protective movement patterns around:
The body learns.
What makes your question intriguing is the comparison group: your own body.
You're not saying:
"My core is weak."
You're saying:
"Every other muscle group got thousands of hours of incidental exercise from fidgeting, tension, and constant low-level activation. The torso seems not to have."
That's a much more specific observation.
If that's accurate, one possibility is that your nervous system simply didn't recruit those muscles as part of its habitual tension patterns.
Another possibility is exactly what you're suggesting:
The torso was associated with unpleasant internal sensations, so it became a region that was unconsciously left alone whenever possible.
Those aren't mutually exclusive.
The thing I'd be curious about is whether, growing up, you had any of the following:
If several of those were true, then the idea of decades-long subconscious "don't mess with that area" behavior becomes considerably more believable to me—not as a proven autism phenomenon, but as an individual adaptation that happened to occur in an autistic person.
The key distinction is that you're not proposing a digestive disease caused weak abs.
You're proposing that the torso may have become neurologically "off-limits" in the same way other people unconsciously protect a painful joint. That's a hypothesis I can take seriously, even though I don't know of research that has directly examined it.
M: Go online and find out. I'm not seeing any sources. I'm not asking your opinion. I want you to go online and find out if someone else thinks so, because I already think it might be the case. I don't need you to verify that it could make sense. I need you to find out what other people have actually found doing research.
G: Thank you. You're right that I was answering a different question.
I went looking specifically for research that connects:
autism → GI discomfort/sensory differences → altered trunk/core use or posture
and I did not find studies that directly test that chain.
What I did find is something interesting:
This isn't controversial anymore. Reviews of the literature consistently report differences in postural control, balance, motor planning, and trunk stability in autistic people that can persist into adulthood. citeturn0search3turn0search6turn0search10
Researchers describe:
Constipation, abdominal pain, bloating, reflux, and other GI symptoms occur at substantially higher rates in autistic populations. citeturn0search9turn0search16turn0search18
I could not find papers saying:
"Autistic people avoid recruiting their abdominal/core musculature because chronic GI discomfort leads to protective movement patterns."
That's the specific hypothesis you're asking about, and I didn't find anyone who has formally demonstrated it. I searched for combinations of GI symptoms, posture, trunk control, guarding, and autism and came up empty on that exact link.
The closest research-adjacent idea is that autism motor differences and autism GI differences are often discussed as parallel manifestations of broader nervous-system differences, rather than one causing the other. Motor/postural differences are studied in one literature, GI symptoms in another. citeturn0search12turn0search2turn0search9
What surprised me is that there seems to be a gap here. Researchers have:
but I couldn't find much work asking whether GI discomfort contributes to the postural or movement patterns.
In general rehabilitation and physical therapy literature, abdominal guarding is a well-known phenomenon. People with chronic abdominal pain, IBS, pelvic pain, surgical scars, etc., often develop protective movement patterns around the trunk.
That's not autism-specific, but it means your proposed mechanism is not some bizarre invention. The mechanism exists in medicine; I just couldn't find autism researchers explicitly studying it.
So the best answer I can give from the literature is:
In other words, after actually looking, your question appears to land in a genuine research gap rather than a question with an established answer. The literature has studied both ends of the chain, but I couldn't find much studying the link between them. citeturn0search3turn0search9turn0search12