The Silent Battle Between My Gut & My Autistic Brain

My gut has always been louder than average. As a child, I could eat everything. As a teenager, I was sensitive. As an adult, I was anxious, IBS-prone, and burnt out. But none of those words quite explained the uncomfortable struggles I carried every day.

It wasn’t until I was diagnosed as an adult with high-functioning autism that something clicked. I didn’t just have a sensitive stomach. I had a sensitive system.

The Autistic Nervous System: Always On
Autism is often described as a neurodevelopmental condition, but what’s not always acknowledged is how deeply physical it can be. The autistic nervous system tends to be hyper-responsive. Sights, sounds, smells, textures, they are all louder. Emotional stress hits harder and sticks around longer. Internal sensations like hunger, pain, and digestion may be dialled up or down in strange and inconsistent ways.

For me, it meant anxiety lived in my stomach more than it lived in my mind.

Gut Health in Autism
Autism and gut issues often go hand-in-hand. The research is still evolving, but we know this much:

Over 50% of autistic individuals report chronic GI issues (bloating, constipation, diarrhea, food sensitivities). Microbiome differences have been found in autistic vs neurotypical individuals; fewer beneficial strains, and more inflammatory markers in those who are on the spectrum.

Food selectivity is common, sensory aversions to textures, smells, or flavours can limit dietary variety and nutritional adequacy. Stress disrupts digestion and autistic people often live in a low-level state of hypervigilance. And yet, so many of us are told, “It’s just stress,” or “You’re too sensitive.” As if it isn’t a real, physiological thing.

Anxiety, Autism, and the Gut-Brain Axis
The gut isn’t just a digestive tube, it’s a second brain, complete with its own nervous system, neurochemical signals, and emotional landscapes. In autistic people, this gut-brain connection seems to be especially delicate. When I’m overwhelmed, my digestion stalls. When I’m anxious, I feel nauseous, and when I eat the wrong texture, my whole system freaks out.

But it goes the other way too. When my gut is calm, I can think clearly and when I eat the right foods, I feel safer in my body. Over the years, I’ve found that nutrition isn’t just about nutrients, it’s about nervous system regulation. It’s about eating in a way that makes my body feel heard, not hijacked. Here’s what helps me:

Simple, Predictable Meals
Variety is nice, but sameness is calming. Having go-to meals reduces food anxiety and fatigue. I rotate safe, satisfying basics with small seasonal changes
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Warm, Cooked Foods
Cold, raw textures can be overstimulating when I’m overwhelmed. Soups, stews, slow-cooked proteins, mashed vegetables, they digest gently and feel like a warm hug.

Salt, Fat, and Carbs (Yes, Really)
Autistic people often run through resources quickly. Restrictive diets can backfire. I make sure I’m eating enough salt (not from junk food), healthy fats, and slow carbs to support my nervous system, especially on overstimulating days.

Magnesium and Omega-3s
Magnesium helps with tension and sleep. Omega-3s support brain health and may help modulate inflammation in the gut-brain axis. I don't like fish, but I do love my dark chocolate which can be a good source of magnesium. That's my excuse anyway! However, there are a lot of great sources of magnesium including: leafy greens, wholes grain, nuts and seeds.

Eating with Ritual
Lighting a candle. Sitting in a quiet space. Using a familiar bowl, I love my stripy bowl! All of these signal safety to my brain and when my brain feels safe, my digestion does too.

There’s no one-size-fits-all solution for autistic digestion. But I’ve learned to listen more, not just to what I eat, but how I feel around food. The goal isn’t a perfect gut. The goal is to feel nourished by the food, by the process, and by the growing self-trust that comes from tuning into your needs without shame.

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