I’m feeling like my previous 2 posts may have been rather negative. Were they too negative? If so, I apologise. In my defense, I’ve been a bit ill and my mood was off for a while there. Feeling more myself now.
In the process of being ill, and being at home with time to google my symptoms, I actually found out some very interesting medical stuff. And several things I’d read about just linked together in my head, in one of those lightbulb moments. Eureka! as they say.
I really want to share this in case it helps anyone. This post is not entirely established science, it is me interpreting and extrapolating from things I’ve read, with a hefty dose of subjectivity from my own experience, so treat with caution/skepticism, OK? But do please read on if you are:
- On the autism spectrum – this one is mainly for you
- On a long-term ketogenic diet – as there’s something here you need to know
- None of the above but you are (i) interested in medical stuff / the human body, or (ii) always read my blog no matter what, or (iii) my Mum. Although I might even give (ii) and (iii) a pass to ignore this one.
Autism and Cortisol
It is said that autism is a difference in brain wiring. This is only half the truth. It fails to recognise that the neurons and synapses of our nervous system extend beyond our brains.
So I’ve talked before about the autonomic nervous system (ANS) – because mine seems to be faulty. Sometimes it seems there is an imbalance between my sympathetic nervous system (fight or flight mode) and my parasympathetic (rest and digest). I’ve discovered you can track this with a fitness tracker which measures heart rate variability (HRV).
I can’t tell you what a healthy HRV is because there are different ways of measuring it and everyone has their own level of normal. For me, when I’m healthy and my nervous system is on balance, my fitbit gives me an overnight HRV in the 25-35 ms range. If it drops to 20-25 range, the fight-or-flight mode has been left on too long and I should rest or de-stress in some way to reset my nervous system. If it drops below 20, I’m probably ill – or will become so if I’m stupid enough to get out of bed.
Where does cortisol come into this?
Quoting from my quick internet search: “Cortisol is a steroid hormone that is produced by your 2 adrenal glands, which sit on top of each kidney. When you are stressed, increased cortisol is released into your bloodstream.”. So cortisol is usually associated with activation of the sympathetic nervous system.
The body has a feedback loop called the hypothalamic-pituitary axis (HPA) which is supposed to keep cortisol at the right level. In most people, there is a diurnal pattern of cortisol levels with the highest around the time you get up in the morning followed by a decline throughout the day, plus some variations due to daily stresses.
Quoting again “Having the right cortisol balance is essential for your health, and producing too much or too little cortisol can cause health problems”. High cortisol leads to Cushing’s syndrome and low cortisol to Addison’s disease – but I’m not going to talk about those here. What I’m talking about is more subtle imbalances.
So for instance, there’s been a few studies taking cortisol measurements in people on the autism spectrum. Not many studies and not many people, but the results seem to indicate that cortisol levels may generally be off. It’s possible that (some) autistics may have lower than normal cortisol levels in the morning, making them less prepared to deal with daily stresses. It’s also possible that when a stress does cause cortisol to rise, the level stays high for too long. Hence the autistic person may continue in the fight-or-flight mode for an extended period.
It seems to me that if those studies are correct and if my cortisol levels are off, it would explain a lot of the issues I have with my nervous system. It could be a partial explanation for autistic meltdowns also, if you consider what might happen if you place stress on a person whose body is completely unprepared to take that stress? And/or if you continue to place stress on a person whose body has not yet recovered from previous daily stresses?
I wonder also if there might be a connection between autistic burnout and adrenal fatigue? Imagine a person getting stuck for long periods in fight-or-flight mode by cortisol levels which are staying high for too long. It wouldn’t be surprising if days or weeks of demand on the adrenals led them to crash and cortisol levels drop too low for the person to function properly.
Seems like we have a way to go to fully understand the connection between autism and cortisol or endocrine dysfunction but I think the common factor may be imbalances in the nervous system.
(To see how your own nervous system is going, I recommend measuring your HRV).
Cortisol and Immune Disorders
One of the things that cortisol does is suppress the immune system. That is why if your immune system malfunctions by causing severe inflammation or autoimmune disease, one of the first options for doctors is to prescribe a corticosteroid such as prednisolone. The corticosteroid will suppress your immune system and thereby dampen any inflammation.
The downside to corticosteroid drugs is that, while the effect is powerful and you may feel great while taking them, they are destroying your body. Amongst other side effects, they may raise your blood pressure and blood sugar, and your bones and joints get damaged. So you can only take them for a short course.
Once the course is over, if your immune dysfunction continues, inflammation will flare back up. There can be a rebound effect also, from your body being accustomed to the extra cortisol and then having it removed. So for instance people who have used steroid creams long term for eczema can get a terrible rash all over, worse than the original eczema, once they stop.
The purpose of the above is just to make clear the powerful effects that cortisol has on the body, and that imbalanced cortisol levels can be associated with immune system dysregulation.
Recent papers have also indicated possible immune system dysregulation amongst autistic children. Immune system issues can include the following (I copied this from https://autism.org/immune-system-function-autism/):
- Immune deficiency / dysfunction: defective or ineffective response
- Hypersensitivity: over-reaction to innocuous foreign material, out of proportion to the potential damage (allergy)
- Autoimmunity: inappropriate reaction towards self, loss of self-recognition
- Inflammation: too-vigorous attack against invaders with ‘bystander’ damage to normal tissue
Children with autism have been shown to have increased incidence of gastrointestinal tract (GI) disorders. Once you understand the immune dysregulation that makes sense. Even if the precise nature of the GI issue can (and does) vary between autistics, many are related to the immune system, including: food sensitivities, allergies, celiac disease, and IBD such as Chrohn’s disease or Ulcerative Colitis.
Immune Disorders and Diet
The common question asked by those suffering from inflammatory disorders (and GI issues in particular) is “What can I eat?”.
Unfortunately, there is no one single dietary approach that will suit everyone. For GI disorders, an appropriate diet will likely involve eliminating (temporarily or permanently) certain foods that generate a reaction in the individual.
There are anti-inflammatory diets, which include plenty of colourful vegetables and fruits and whole foods, while limiting processed foods, high fat or high sugar foods, alcohol, and so on. If you have a GI disorder, though, elimination of particular problem foods will take precedence. So for instance, you may find that you are unable to tolerate ‘healthy’ dietary options such as: whole grains, cruciferous vegetables, tomatoes or seeded fruit, apples, or probiotics.
DO NOT trust anyone who believes all autistics with GI issues should be on a gluten-free and casein-free (GF/CF) diet. This is bunk, there is no scientific basis at all. Some may be intolerant to gluten and/or casein, true, but many may have other GI issues. The reason why so many autistic children do better on this diet is that removal of wheat and dairy helps with other issues also, such as lactose intolerance, wheat allergy, intolerance of fibre or lectins, and/or it has removed a whole load of ultra-processed junk food from their diet.
Oh, I had to come back and edit because I forgot something… another diet sometimes adopted for autism is the Specific Carbohydrate Diet (SCD) or a variant called the GAPS (Gut and Psychology Syndrome) Diet. I need to warn you about these because they are highly restrictive. I tried transitioning from keto to SCD and couldn’t do it, I just got crazy hungry. Although the keto diet is very low carb, the fat and protein levels keep you satisfied, whereas SCD is both low carb and low or moderate fat. If you want to try these diets you need to be really careful that you are getting everything your body needs, and I would be cautious putting a growing child on them.
Finally, for those who have made it this far, I have a warning about following the ketogenic (keto) diet long-term. As you may know, I’m a fan of the keto diet. Running on ketones instead of glucose made me feel better – it levelled my mood and cleared my head, and it didn’t seem to aggravate GI issues for a long time. But I think I may have stayed on it for too long.
What I now know is that the high fat and protein levels in the diet make it inflammatory. By forcing your body to produce glucose from protein by gluconeogenesis, it places stress on your body and increases cortisol levels. You need to regularly come off the diet (say within 4-6 months) to give your body a break and avoid adrenal fatigue.
To be clear, I’m not blaming keto for my recent illness, which comprised an unexpected allergic reaction (when I had no allergies before), followed by a systemic inflammatory response which has been simmering along for the last 4 weeks. (Just getting over it now). I think the cause was a combination of factors, including a recent viral illness and, perhaps, my pre-existing nervous system / endocrine imbalance (possibly exacerbated by post-keto adrenal fatigue) which may have led to an immune malfunction – a combination of factors which inspired this post.
Any thoughts or comments?