49. Mould & Mitochondria: Why You're Still Exhausted (and What's Really Driving It)

Persistent fatigue is one of the most common—and most frustrating—symptoms experienced by people with mould illness. Many find that despite sleeping more, resting, pacing themselves, and trying countless supplements, the exhaustion simply doesn't improve.

In this episode of The Histamine Well Podcast, Joanne explores the hidden connection between mould illness and mitochondrial dysfunction, revealing why fatigue can persist long after mould exposure has been identified.

You'll learn how three key factors often work together to impair cellular energy production:

• Mycotoxins and their direct toxic effects on mitochondria
• Sulfur depletion and reduced glutathione production
• Oxalate accumulation and mitochondrial stress

Joanne explains how these mechanisms can disrupt ATP production, increase oxidative stress, and contribute to symptoms such as chronic fatigue, brain fog, muscle weakness, exercise intolerance, post-exertional malaise, pain sensitivity, and temperature dysregulation.

This episode also explores the important relationship between mould exposure, gut dysbiosis, SIBO, sulfur metabolism, and oxalate overload—factors that are frequently overlooked when addressing ongoing fatigue and recovery from mould illness.

Whether you're a practitioner, student, or someone navigating chronic health challenges, this episode provides valuable insights into the biological processes driving fatigue and what may need to be addressed for meaningful recovery.

In this episode, you'll discover:

• How mould toxins damage mitochondrial function
• Why fatigue often persists despite rest and sleep
• The critical role of sulfur in energy production and detoxification
• How oxalates can contribute to mitochondrial dysfunction
• Common signs of mould-related mitochondrial impairment
• Why addressing mould exposure alone may not be enough for recovery

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Transcript

0:00

Hi, it's Joanne. What if the fatigue you're experiencing isn't simply about sleep, stress, or doing too much? One of the most common things I hear from people with mold illness is, "I'm exhausted all the time, but nothing seems to help." They rest, they sleep, they try supplements, they pace themselves, and yet the fatigue remains. That's because mold doesn't just affect one system in the body. It can create a cascade of downstream effects that directly impact how your cells produce energy. In today's episode, we're going to explore three major drivers of mitochondrial dysfunction that often occur together in mold illness: mycotoxins, sulfur depletion, and oxalates. Once you understand how these three factors interact, you'll have a much clearer picture of why fatigue can be so profound and what needs to be addressed to support recovery. Welcome to the Histamine Well Podcast. Designed for practitioners and patients alike. This is your trusted source for insights on histamine intolerance, methylation, gut health, women's hormones, and much more. I'm Joanne Kennedy, your host, naturopath, author, and educator, passionate about breaking down complex science into clear, accessible knowledge. Whether you're a health professional or navigating your personal wellness journey, the Histamine Well Podcast bridges the gap between cutting-edge research and practical understanding to empower you with the tools to thrive. Hi, everyone. Welcome back to The Histamine Well. Today, I'm gonna talk about something that I think explains a lot of the deep, unrelenting fatigue that people with mold illness experience. And why that fatigue so often doesn't respond to rest, sleep, or the usual supports. We're going to look at three things that converge on mitochondria. Mold and mycotoxins, sulfur depletion, and oxalates. Each one on its own can impair mitochondrial function, but in mold illness, we often see all three happening at the same time. And when that's the case, the impact on energy production can be profound. So what are mitochondria and why do they matter? So mitochondria are often described as the cell's powerhouses. And that's essentially right. Their primary job is producing ATP, which is the body's main energy currency. They do this through a series of reactions called the electron transport chain, where electrons are passed along a series of protein complexes to ultimately drive ATP production. When this process is disrupted by toxins, oxidative stress, nutrient depletion, or structural damage to the mitochondria themselves, energy production falls. Cells can't do their job properly. And the tissues with the highest energy demands feel it the most, the brain, muscles, nervous system, and the immune system. And this is why mitochondrial dysfunction produces the symptoms that it does. So how does mold and mold mycotoxins damage the mitochondria? Many mycotoxins are directly mitotoxic, meaning they are toxic to the mitochondria themselves. Mycotoxins like ochratoxin and aflatoxins have been shown to inhibit key complexes in the electron transport chain, particularly complex one and complex three. When these complexes are impaired, electron flow through the chain becomes disrupted, ATP production drops, and critically, reactive oxygen species or free radicals begin to accumulate. Mycotoxins can also damage the mitochondrial membrane, disrupt mitochondrial calcium signaling, and even damage mitochondrial DNA. Because mitochondria have their own DNA separate from the cell's nucleus, and because they replicate independently, repeated mycotoxin exposure can cause cumulative mitochondrial damage over time. This is one of the reasons people with chronic mold illness often experience such deep, persistent fatigue, and why that fatigue tends to be worsened by physical or cognitive exertion rather than relieved by rest. We need to understand the link between mold and sulfur depletion and how this is gonna make mitochondrial issues worse. Sulfur is often an overlooked nutrient, but it plays an absolutely essential role in mitochondrial protection. Sulfur-containing Compounds are essential for producing glutathione, the body's major antioxidant, as well as taurine, alpha-lipoic acid, coenzyme Q10, all of which are critical for mitochondrial function and protection against oxidative stress. In mold illness, the demand for glutathione increases dramatically. The body is dealing with an ongoing toxic and inflammatory burden, and glutathione is then used rapidly to neutralize mycotoxins and manage oxidative stress. Over time, this creates a state of functional sulfur depletion where the body simply cannot keep pace with its own demand. When glutathione and these other sulfur-dependent compounds are low, the mitochondria lose their primary protection against the reactive oxygen species that are already being generated by mycotoxin-impaired electron transport chains. Oxidative damage to mitochondrial membranes, enzymes, and DNA accelerates. It becomes a self-reinforcing cycle. Mycotoxins increase oxidative stress, sulfur depletion removes the buffers, and mitochondrial function deteriorates further. Before we go any further, I want to speak directly to the practitioners and students listening. If you're intrigued by histamine and methylation and eager to expand your knowledge in this fascinating area, we offer the Histamine and Methylation Online Group Coaching course. The only program of its kind. It covers everything you need to know about histamine and methylation, providing both the theory and guidance you need to treat these issues effectively in clinical practice. We cover SIBO, hormonal imbalances, oxalates, MTHFR, the four pathways of methylation, including the folate pathway, methionine pathway, tetrahydrobiopterin pathway, and the all-important transsulfuration pathway, and much more. The program is delivered by detailed online webinars and handouts for you to keep, and for eight weeks, you'll meet with me for live coaching calls in a private community space with other practitioners from all over the world dealing with histamine and methylation issues in their patients every day. Together, we learn so much. To learn more and apply, visit joannekennedynaturopathy.com We can't have a conversation about mold without discussing oxalates. Oxalates are organic acids found in many foods. They are either broken down by gut bacteria or excreted through urine. But in the context of mold illness and the gut dysbiosis that often accompanies it, oxalate levels can rise significantly. There are a few reasons for this. Some mold species, particularly Aspergillus, produce oxalates directly as a metabolic byproduct. When gut dysbiosis and SIBO are present, the beneficial bacteria that degrade oxalates, particularly Oxalobacter formigenes, are often depleted. And because the gut lining is frequently more permeable in mold illness, more dietary oxalates are absorbed than would normally be the case. Once oxalates accumulate in the body, they cause real problems for the mitochondria. They can deposit directly within mitochondria where they inhibit key enzymes in that electron transport chain, particularly complex one and complex two. They also chelate calcium, disrupting the calcium signaling that mitochondria rely on for proper function. And like mycotoxins, they increase the generation of reactive oxygen species. So clinically, oxalate accumulation can show up as burning pain, kidney stones, urinary symptoms, joint pain, and profound fatigue, all of which are symptoms we frequently see in people with mold illness. So it often goes hand in hand. Mold illness, oxalate problems, mitochondrial damage. We also really need to understand the interesting oxalate-sulfur connection. And this is really important because oxalates and sulfur are closely linked, and understanding this connection helps explain why both tend to be a problem at the same time. So what does this look like clinically? When mold-related mitochondrial dysfunction is present, people often describe a particular kind of exhaustion that is different from ordinary tiredness. So common presentations include profound fatigue that doesn't improve with rest or sleep, post-exertional malaise, a significant worsening of symptoms after physical or cognitive activity, brain fog and difficulty concentrating, muscle weakness and pain, heightened sensitivity to pain, exercise intolerance, even mild exertion triggers a crash, temperature dysregulation, so difficulty staying warm or managing heat, sensitivity to light, sound, and chemical exposures. Many of these people have been told their fatigue is psychological or have been diagnosed with conditions like chronic fatigue syndrome or fibromyalgia without the underlying mitochondrial mold, sulfur, and oxalate issue being identified. So we see this so often clinically where someone's found out they've got mold issues, they move out of the house where there's mold, but they don't do a real workup on what that mold has actually done to the body. Has the mold caused gut dysbiosis, which can cause an issue with oxalate? Is it causing significant sulfur depletion? Is there mitochondrial issues? So if you have had mold illness and you're still struggling, if you know you've got sulfur issues, if you know you've got oxalate issues or if you are having persistent fatigue. Fatigue that doesn't lift from a good night's sleep, then we're absolutely here to help. We see patients online globally. You can easily book an appointment to see me via my website, joannekennedynaturopathy.com. Thank you for joining me. I hope you found this episode beneficial. Be sure to subscribe to The Histamine Well so you don't miss an episode. If this podcast has supported you, one of the most impactful ways to help us reach more people is to leave a review on Apple or Spotify. Take a quick screenshot and email it to us at info@joannekennedy.com.au and as a thank you gift, we will send you a copy of my histamine intolerance e-book. Until next time, take care and be well.