Functional Medicine Approach for Thyroid Health & Wellness

Improve your thyroid health through a functional medicine approach, emphasizing personalized and holistic care for better results.

Abstract

Welcome to our educational post on thyroid health from a functional and integrative medicine perspective. My name is Dr. Alex Jimenez, and I hold certifications as a Doctor of Chiropractic (DC), Advanced Practice Registered Nurse (APRN), Family Nurse Practitioner (FNP-BC), Certified Functional Medicine Practitioner (CFMP, IFMCP), and further specializations in Anti-aging, Regenerative & Functional Medicine (ATN) and Chiropractic Cranial Spinal Techniques (CCST). This post will take you on a journey to understand the intricate workings of your thyroid, moving beyond the simplistic view of just prescribing medication. We will explore the case of “Jennifer,” a 41-year-old woman who, despite being on multiple thyroid medications, continued to suffer from debilitating symptoms. Her story illustrates a common problem: addressing symptoms without understanding the root cause. We will explore the four primary physiological mechanisms that account for over 90% of thyroid dysfunction, none of which medication alone can resolve. These mechanisms include systemic inflammation, liver congestion, gut dysbiosis, and HPA axis dysregulation (chronic stress). We will dissect how these issues disrupt the critical conversion of the inactive thyroid hormone (T4) into the active hormone (T3), effectively leaving you metabolically “running on empty.” Throughout this discussion, I will explain the underlying physiology in detail, highlighting the roles of enzymes like deiodinases, the impact of inflammatory cytokines, and the critical functions of the liver and gut. I will also explain how our unique, multidisciplinary practice at Injury Medical Clinic PA in El Paso, Texas, integrates chiropractic care, functional medicine, and conventional medical oversight to create a comprehensive, personalized treatment plan. Our approach, which I lead alongside our esteemed Medical Director, Dr. Maria Guadalupe Cardenas, MD, an internist with over 40 years of experience, is designed to restore function, not just mask symptoms. This is modern, evidence-based healthcare, focused on you as a whole person.

Our Integrative and Collaborative Practice: A New Model of Care

Before we dive into the complexities of thyroid physiology, I believe it is essential to provide some context about our clinical philosophy and practice structure here at Injury Medical Clinic PA. I am Dr. Alex Jimenez, and my journey in healthcare has been driven by a passion for understanding the interconnectedness of the human body. My extensive training across multiple disciplines—from chiropractic (DC) and advanced practice nursing (APN, FNP-BC) to the deep, systems-based approach of functional medicine (CFMP, IFMCP)—has given me a unique perspective on health and healing.

This multidisciplinary foundation is the bedrock of our practice. We believe the most effective patient care comes not from a single viewpoint but from collaboration among different experts. This is why I am honored to work alongside Dr. Maria Guadalupe Cardenas, MD. Dr. Cardenas is a board-certified internist with a remarkable career spanning over four decades. Her profound experience in internal medicine provides an invaluable layer of medical oversight and diagnostic acumen to our team. As our Medical Director and Collaborative Physician (NPI #1164426749, Texas MD License #J2933), she plays a crucial role in our multidisciplinary model.

This setup, where a Doctor of Chiropractic like myself works in close collaboration with a Medical Doctor, is a hallmark of modern integrative and injury care clinics. It allows us to offer the best of both worlds. We can harness the power of chiropractic adjustments to restore nervous system function and structural integrity, utilize functional medicine to uncover the biochemical root causes of chronic disease, and rely on Dr. Cardenas’s medical expertise for comprehensive diagnostics, conventional treatment options when necessary, and overall medical direction. Our services extend to personal injury care, rehabilitation, nutritional counseling, and more, all under one roof. This integrated team approach ensures that our patients receive a truly holistic and robust plan of care, tailored precisely to their individual needs. This collaborative spirit allows us to successfully manage complex cases like the one we are about to explore.

A Patient’s Cry for Help: The Story of Jennifer

Let me introduce you to Jennifer. Her story is one I’ve seen repeated countless times over my 30 years in practice, and it perfectly encapsulates why a new approach to thyroid care is so desperately needed. Jennifer is 41 years old. She first reached out by sending me a video message. In the video, she was in tears, a raw and honest portrait of desperation and fatigue. Her story was heartbreaking. For seven long years, she had been trapped in a body that felt like it was betraying her.

Despite being under the care of five different doctors and being prescribed both Synthroid® (levothyroxine sodium) and a generic form of levothyroxine, her health was deteriorating. She was gaining weight no matter how little she ate or how much she exercised. A profound, unshakeable depression had settled over her, casting a gray shadow on every aspect of her life. Her hands and feet were perpetually cold, a classic sign of a sluggish metabolism. A thick brain fog clouded her thoughts, making it difficult to concentrate, remember things, or even engage in simple conversation. She described her daily existence as “dragging herself through life.” The vibrant, energetic woman she once was had become a distant memory.

Jennifer’s doctors had followed the standard protocol. They saw that her TSH (Thyroid-Stimulating Hormone) was elevated, diagnosed her with hypothyroidism, and wrote a prescription. When her symptoms didn’t improve, they adjusted the dose. When that didn’t work, they tried another brand or combination. Yet, with each new prescription and each passing year, she only felt worse.

Her story is a tragic but common example of a fundamental flaw in the conventional approach to thyroid disease. It focuses almost exclusively on the thyroid gland itself and the medication designed to supplement its hormone production, while ignoring the vast and complex biological landscape where these hormones must actually do their work. Jennifer didn’t need more medication; she needed someone to ask why her body wasn’t using the hormones it was being given. This is where our journey into functional medicine begins.

Thyroid Biology 101: Beyond the Gland

To understand why Jennifer’s treatment was failing, we need to take a step back and revisit some fundamental biology. It’s crucial to move past the overly simplistic idea that the thyroid gland is the sole player in metabolic health.

The Manufacturing Plant: The Thyroid Gland and T4

Think of your thyroid gland, that small, butterfly-shaped organ in your neck, as a specialized manufacturing plant. Its primary job, and really its only job, is to produce thyroid hormones. It accomplishes this by taking iodine from your diet and combining it with the amino acid tyrosine. The main product it cranks out is a hormone called thyroxine, or T4. The “4” refers to the four iodine atoms attached to its molecular structure.

T4 is largely a prohormone, meaning it is biologically inactive. It’s a stable, well-packaged product ready for shipment, but it can’t actually do much on its own. It can’t bind effectively to the nuclear receptors inside your cells to turn on your metabolic machinery. T4 is simply the raw material, the precursor to what your body truly needs. The conventional medical model often stops here, assuming that if you provide enough T4 (in the form of medications like Synthroid® or levothyroxine), the body will take care of the rest. As Jennifer’s case shows, this assumption is often tragically wrong.

The Conversion Engines: Where the Real Magic Happens

The real metabolic magic doesn’t happen in the thyroid gland; it happens in your body’s peripheral tissues. These tissues act as powerful conversion engines. They take the inactive T4 and convert it into the powerhouse hormone: triiodothyronine, or T3. The “3” signifies that one iodine atom has been removed, a seemingly small change that has monumental biological consequences.

This conversion is the single most critical step in thyroid physiology, and a family of enzymes called deiodinases carries it out. T3 is the biologically active hormone. It’s what binds to receptors in the nucleus of nearly every cell in your body—from your brain to your muscles to your fat cells—and tells them to rev up their engines. T3 is what dictates your basal metabolic rate, controls your body temperature, supports your mood and cognitive function, and regulates your energy levels.

Where are these crucial conversion engines located?

• The Liver: This is the undisputed champion of T4-to-T3 conversion. Approximately 60-80% of your active T3 is generated within the liver’s cells, known as hepatocytes. The primary enzyme at work here is Deiodinase Type 1 (D1).
• The Gut: The gastrointestinal tract is another significant player, contributing up to 20% of T3 conversion. This process is heavily dependent on a healthy population of gut bacteria and an enzyme called intestinal sulfatase.
• Other Tissues: The remaining conversion occurs in various other tissues, including the kidneys, skeletal muscle, and even the brain. The brain, in particular, relies on a different enzyme, Deiodinase Type 2 (D2), to ensure it has a steady, locally controlled supply of T3, which is vital for neurotransmitter function and cognitive clarity.

If this peripheral conversion system is broken, you are effectively running on an empty metabolic tank. It doesn’t matter how much T4 you have circulating in your bloodstream, whether it comes from your own thyroid gland or from a bottle of Synthroid®. If your body cannot convert that T4 into active T3, you will experience all the debilitating symptoms of hypothyroidism: fatigue, weight gain, depression, cold intolerance, and brain fog.

This is precisely what was happening to Jennifer. Her doctors were pouring more and more T4 into her system, but her conversion engines were offline. Her body wasn’t just failing to make active T3; it was actively shunting the excess T4 down a defensive pathway, making things progressively worse. All her biology was doing was converting those medications into something called reverse T3 (rT3), a competitive inhibitor that blocks T3 receptors, further deepening her hypothyroid state. This is a crucial concept we will explore in detail next.

The Four Horsemen of Thyroid Dysfunction

Over my three decades of clinical practice and deep immersion in functional medicine research, I have consistently found that over 90% of thyroid problems trace back to four primary physiological mechanisms. The beauty of this framework is that none of them inherently require medication. Instead, they require a deep, investigative approach to identify and correct the underlying imbalance. Let’s break them down one by one, because understanding them is key to unlocking true thyroid healing.

1. Systemic Inflammation: The Biological Grenade

The first and perhaps most pervasive disruptor of thyroid function is systemic inflammation. Think of inflammation as your body’s internal fire alarm. A short-term, localized fire (like from a cut or an infection) is healthy and necessary for healing. But chronic, low-grade, body-wide inflammation is like a fire alarm that is blaring 24/7. This constant state of alert wreaks havoc on your delicate hormonal signaling pathways.

The Source of the Fire

This chronic inflammation can stem from many sources, and identifying the specific trigger is a cornerstone of the functional medicine approach. Common culprits include:

• Chronic Infections: Latent or reactivated viral infections, such as Epstein-Barr Virus (EBV), Cytomegalovirus (CMV), or Herpes Simplex Virus (HSV), can keep the immune system in a constant state of high alert.
• Gut-Derived Inflammation: A condition known as “leaky gut,” or increased intestinal permeability, allows bacterial components like Lipopolysaccharides (LPS) to leak from the intestines into the bloodstream, triggering a massive inflammatory response. We’ll discuss this in more detail later.
• Obesity: Adipose tissue (body fat) is not just an inert storage depot for calories. It is a highly active endocrine organ that produces and secretes many pro-inflammatory signaling molecules.
• Autoimmunity: Conditions like Hashimoto’s Thyroiditis, where the immune system mistakenly attacks the thyroid gland, are fundamentally driven by an underlying inflammatory process.
• Poor Diet: A diet high in processed foods, refined sugars, and industrial seed oils is inherently pro-inflammatory.
• Environmental Toxins: Exposure to heavy metals, pesticides, and plastics can also fuel chronic inflammation.

The Molecular Mayhem: Cytokines and NF-kappaB

Regardless of the source, the biological result is the same: your immune cells dump massive quantities of inflammatory messengers called cytokines into your circulation. Molecules like Tumor Necrosis Factor-alpha (TNF-α), Interleukin-6 (IL-6), and Interleukin-1 (IL-1) are the primary agents of this inflammatory cascade.

I often describe these cytokines to my patients as biological grenades. They are designed for short-range combat, but when they flood the entire system, they cause widespread collateral damage. One of their primary targets is a master switch for inflammation inside your cells called Nuclear Factor-kappa B (NF-κB).

When cytokines activate NF-κB, it initiates a powerful genetic program that has devastating consequences for thyroid hormone conversion:

1. It shuts down D1 and D2 deiodinase: NF-κB activation directly suppresses the genes that code for Deiodinase Type 1 (D1) and Deiodinase Type 2 (D2). These two enzymes convert inactive T4 into active T3 in the liver, brain, and other tissues. The conversion engines are effectively turned off.
2. It cranks up D3 deiodinase: Simultaneously, NF-κB powerfully upregulates the gene for another enzyme, Deiodinase Type 3 (D3). D3’s sole job is to convert T4 into reverse T3 (rT3).

This is a disastrous one-two punch. Your body not only stops making the active hormone (T3) but also starts actively converting your precious T4 supply into a useless imposter (rT3).

Reverse T3: The Metabolic Brake

Reverse T3 (rT3) is the competitive inhibitor I mentioned earlier. Its molecular structure is a mirror image of T3, which allows it to fit perfectly into the T3 receptors on your cells. However, itdoesn’tt activate the receptor. It just sits there, blocking it. It’s like putting the wrong key into a lock; it gets stuck and prevents the right key from getting in.

From a physiological perspective, this is a brilliant survival mechanism. If the body is under severe stress (like a life-threatening infection, a major source of inflammation), it makes sense to slow metabolism to conserve energy. The body intentionally hits the metabolic brakes by producing rT3. The problem arises when this “emergency brake” gets stuck in the “on” position due to chronic, low-grade inflammation.

This is why simply giving a patient like Jennifer more levothyroxine (T4) can be so counterproductive. In an inflamed body, that extra T4 becomes more fuel for the D3 enzyme to produce more rT3. The patient’s TSH might look better on a lab report, but they feel worse because their cells are being starved of active T3 at an even greater rate. Their metabolic brakes are being slammed harder and harder.

Chiropractic Care’s Role: From a structural and neurological standpoint, chronic inflammation is often linked with physical stress and nervous system dysregulation. A subluxation, or misalignment in the spine, can create nerve interference that disrupts the body’s ability to regulate its immune and inflammatory responses properly. Chiropractic adjustments help restore proper neurological function, which can downregulate the sympathetic “fight-or-flight” response that often fuels inflammation. By improving nervous system communication, we can help the body better manage its inflammatory state, creating a more favorable environment for thyroid hormone conversion.

2. Liver Congestion: The Clogged Conversion Engine

As we established, the liver is the primary site of T4-to-T3 conversion, accounting for up to 80% of your body’s active thyroid hormone. If the liver isn’t healthy, your thyroid function will inevitably suffer, regardless of how well your thyroid gland is working. I often refer to this as a congested liver, a state where the liver’s ability to perform its myriad metabolic tasks is impaired.

The Fatigued Hepatocyte: NAFLD and ER Stress

The main conversion enzyme in the liver is D1 deiodinase, and its activity is highly sensitive to the health of the liver cells, or hepatocytes. In our modern world, one of the most common assaults on the liver is Non-Alcoholic Fatty Liver Disease (NAFLD). Driven by diets high in sugar, refined carbohydrates, and unhealthy fats, this condition causes hepatocytes to accumulate tiny lipid droplets.

This fat accumulation does more than take up space. It triggers cellular stress, particularly within an organelle called the endoplasmic reticulum (ER). The ER is like a cellular factory floor where proteins are folded and assembled. When it becomes overwhelmed with misfolded proteins and metabolic stress (a condition known as ER stress), it sends out alarm signals that shut down non-essential processes to conserve resources. Unfortunately, from the cell’s perspective, D1 deiodinase activity is considered “non-essential” during a crisis.

Research, such as the study by Wajner et al. (2011), has shown that conditions inducing ER stress significantly decrease D1 deiodinase expression and activity. So, in a person with a fatty, congested liver, the very machinery needed to convert T4 to T3 is systematically dismantled at the cellular level.

The Bile Backlog: Stalled Hormone Clearance

It gets even worse. The liver’s role in thyroid health extends beyond simple conversion. It’s also responsible for conjugating thyroid hormones and preparing them for elimination or recycling. This process involves attaching molecules like glucuronic acid or sulfate to the hormone, making it water-soluble so it can be excreted in the bile.

A portion of this conjugated hormone travels with the bile into the intestines. In a healthy gut, some is deconjugated by bacterial enzymes and reabsorbed into the bloodstream for reuse. This elegant recycling system is known as the enterohepatic circulation.

However, in a congested liver—often the same liver suffering from NAFLD—bile production and flow are compromised. The bile becomes thick and sludgy, a condition known as cholestasis. When bile flow stalls, this entire enterohepatic loop grinds to a halt. Thyroid hormones, both active and inactive, are not properly cleared or recycled. They can back up in the system, creating a “hormone traffic jam” that further disrupts the delicate feedback loops controlling thyroid function. This impaired clearance can contribute to the very inflammation and ER stress that initiated the problem, creating a vicious, self-perpetuating cycle of liver dysfunction and thyroid resistance.

Our Integrative Approach: Here, the collaboration between functional medicine and our medical director, Dr. Cardenas, is key. Dr. Cardenas can order and interpret liver function tests (LFTs) and imaging, such as an ultrasound, to formally diagnose conditions like NAFLD. From a functional medicine perspective, we then go deeper, using specialized testing to look at markers of inflammation and oxidative stress. Our treatment plan would include a comprehensive nutritional protocol to reverse fatty liver—eliminating sugars and refined carbs and incorporating liver-supportive foods and nutrients like milk thistle, N-acetylcysteine (NAC), and phosphatidylcholine. This multifaceted approach addresses both the medical diagnosis and the underlying metabolic dysfunction.

3. Gut Dysbiosis and Leaky Gut: The Broken Gateway

While the liver does the heavy lifting, the gut contributes a crucial 20% of the body’s active T3. This may sound modest, but the gut’s influence extends far beyond its direct conversion capabilities. The health of your gastrointestinal system can, in many ways, determine whether your liver is even capable of functioning as an efficient conversion organ.

The Role of the Microbiome in T3 Recycling

As mentioned, a significant amount of conjugated T3 and T4 enters the intestines via bile. The fate of these hormones then falls to your gut bacteria, or microbiome. A healthy, diverse microbiome produces an enzyme called intestinal sulfatase. This enzyme acts like a pair of scissors, cleaving the sulfate or glucuronic acid molecule off the conjugated thyroid hormone. This process, called deconjugation, effectively reactivates the hormone and allows it to be reabsorbed through the intestinal wall back into the portal circulation, where it returns to the liver and the rest of the body.

This is a vital part of the body’s T3 economy. However, in a state of dysbiosis—an imbalance in the gut microbiome where beneficial bacteria are diminished, and pathogenic or opportunistic organisms overgrow—this system breaks down. When the healthy bacteria that produce sulfatase are gone, the body can’t recycle conjugated T3d. Instead, it remains bound and is flushed right down the toilet in your stool. You are literally pooping out your precious active thyroid hormone. This loss of 20% of your T3 supply is a massive metabolic blow.

Leaky Gut and the LPS Firestorm

The consequences of dysbiosis often don’t stop there. An unhealthy microbiome frequently leads to increased intestinal permeability, or leaky gut. The single-cell layer lining your intestines is meant to be a tightly controlled barrier. In leaky gut, the junctions between these cells become loose, allowing substances that should remain in the gut to “leak” into the bloodstream.

One of the most damaging substances to leak through is Lipopolysaccharide (LPS). LPS is a component of the outer membrane of Gram-negative bacteria and a potent endotoxin. When LPS enters the circulation, the immune system sees it as a major invasion and mounts a massive inflammatory response.

This brings us full circle back to our first mechanism. The flood of LPS into the bloodstream is one of the most powerful triggers for releasing inflammatory cytokines like TNF-α and IL-6. As we discussed, these cytokines activate NF-κB, which in turn annihilates D1 deiodinase activity in the liver.

So, a sick gut delivers a devastating double blow to your thyroid:

1. It prevents the recycling of active T3, causing you to lose it in your stool.
2. It floods your body with inflammatory LPS, shutting down T3 conversion in your liver.

This is how a problem that starts in your gut can manifest as classic hypothyroid symptoms throughout your entire body.

The Functional Medicine and Chiropractic Connection: In our clinic, addressing the gut is paramount. We utilize advanced stool testing to analyze the microbiome, check for pathogens, and assess markers of inflammation and leaky gut. Our treatment protocols—often referred to as the “5R Program” (Remove, Replace, Reinoculate, Repair, Rebalance)—are designed to heal the gut systematically. At the same time, chiropractic care plays a supportive role. The autonomic nervous system extensively innervates the gut. Spinal misalignments, particularly in the thoracic and lumbar regions, can impair the nerve signals that control gut motility, secretion, and immune function. By performing targeted adjustments, we can help restore proper nerve flow to the digestive organs, complementing our functional medicine protocols and helping the gut heal and function optimally.

4. HPA Axis Dysregulation: The Stress-Famine Connection

The final, and critically important, mechanism is the dysregulation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. This is our central stress response system. Biology, in its ancient wisdom, cannot tell the difference between being chased by a predator, the chronic psychological stress of a modern lifestyle (financial worries, relationship problems, traffic), or the physiological stress of a prolonged caloric deficit. To the HPA axis, they all look identical.

Cortisol: The Conversion Crusher

When the HPA axis is activated, the adrenal glands release the stress hormone cortisol. In short bursts, cortisol is essential for survival. It mobilizes energy, heightens focus, and suppresses non-essential functions. However, when stress becomes chronic, cortisol levels become chronically elevated, and this has a direct and devastating effect on thyroid conversion.

Just like the inflammatory cytokine NF-κB, high levels of cortisol directly crush D1 deiodinase activity in the liver. This is another one of the body’s innate survival mechanisms. If the body perceives it is in a state of chronic danger or famine, the last thing it wants is to run a fast, energy-expensive metabolism. So, it puts the brakes on T4-to-T3 conversion to conserve resources. This is why individuals under immense, prolonged stress often develop hypothyroid symptoms, even if their thyroid gland is perfectly healthy.

The “Dieting” Trap: A Self-Imposed Famine

Here is where so many well-intentioned people, including many of my patients when they first come to see me, go terribly wrong. A person feels tired, notices they’ve gained weight, and correctly identifies that their metabolism is sluggish. Their logical next step is to “fix” their metabolism by going on a strict diet. So they start fasting, drop into a huge caloric deficit, and dramatically cut their carbohydrate intake. They have great commitment, but absolutely lousy timing.

Let’s break down why this is so catastrophic for thyroid function.

1. Hepatic Glycogen Depletion: The conversion of T4 to T3 in the liver is not a “free” process. It is insulin- and glycogen-dependent. Your liver needs a stored supply of glucose (in the form of glycogen) to fuel the deiodinase enzymes. Low-carb diets and heavy caloric restriction rapidly deplete these crucial hepatic glycogen stores. The factory runs out of power.
2. Crashing Leptin and Insulin: Heavy caloric restriction and low carbohydrate intake also cause circulating levels of two key metabolic hormones, insulin and leptin, to crash. Leptin is the hormone that tells your brain you have enough energy stored in your fat cells.

The liver is exquisitely sensitive to these signals. From the liver’s perspective, low glycogen, low insulin, and low leptin can mean only one thing: famine. The body believes it is starving. In response, it does what any intelligent organism would do during a famine: it enters survival mode. It immediately and dramatically shuts down D1 deiodinase activity to conserve every possible calorie. The metabolic rate plummets.

This is a cruel irony. Trying to “fix” a slow metabolism through aggressive dieting is what slows it down even further. The body fights back against perceived starvation, leading to a frustrating plateau, followed by rebound weight gain as soon as normal eating patterns resume.

What is Thyroid Dysfunction?- Video

The Common Denominator: A Path to Healing

Do you know what these four cases—inflammation, a congested liver, a leaky gut, and HPA axis dysregulation—all share?

• They are all detectable through a combination of standard and functional laboratory testing.
• Well-established principles of physiology and biochemistry all easily explain them.
• They are all addressable without writing a single prescription.

Everything we need to diagnose and treat these conditions is in the research playbook. We can measure inflammatory markers like hs-CRP and cytokines. We can use advanced stool analysis to assess the gut. We can run a DUTCH test to map out cortisol patterns. We can look at liver enzymes and blood sugar markers. The answers are there if you know where to look.

Jennifer’s case was a classic combination of all four. Years of chronic stress had dysregulated her HPA axis. A poor diet had led to a congested liver and gut dysbiosis. This combination created a firestorm of systemic inflammation that completely shut down her ability to use the thyroid hormone medication her doctors were prescribing. Our job was not to give her a different pill, but to put out the fires, decongest her liver, heal her gut, and teach her body that it was safe to run a healthy metabolism again.

This is the power of integrative and functional medicine. It’s about being a biological detective, asking “why,” and respecting the profound interconnectedness of the body’s systems. It’s about providing the body with what it needs to heal itself. And it is a path to lasting wellness that has brought hope and health back to countless patients just like Jennifer. The specific labs we ran for her case will be available for viewing in my stories. You are welcome.

References

• Wajner, S. M., & Maia, A. L. (2011). New insights into the physiology of deiodinases. Arquivos Brasileiros de Endocrinologia & Metabologia, 55(8), 647-654. https://doi.org/10.1590/S0004-27302011000800008
• Gereben, B., Zavacki, A. M., Ribich, S., Kim, B. W., Salvatore, D., Harney, J. W., & Larsen, P. R. (2008). Cellular and molecular basis of deiodinase-regulated thyroid hormone signaling. Endocrine Reviews, 29(7), 898–938. https://doi.org/10.1210/er.2008-0019
• Kneifel, U., & Staudinger, R. (2015). The role of the gut microbiome in the regulation of thyroid hormones. Clinical Nutrition ESPEN, 10(5), e213. https://doi.org/10.1016/j.clnesp.2015.07.037
• Virili, C., & Centanni, M. (2015). “Does microbiota composition affect thyroid homeostasis?” Endocrine, 49(3), 583–587. https://doi.org/10.1007/s12020-014-0509-2
• Mancini, A., Di Segni, C., Raimondo, S., Olivieri, G., Silvestrini, A., Meucci, E., & Currò, D. (2016). Thyroid hormone, oxidative stress, and inflammation. Mediators of Inflammation, 2016, 6757154. https://doi.org/10.1155/2016/6757154
• van der Spek, A. H., Fliers, E., & Boelen, A. (2017). The classic pathway of thyroid hormone metabolism and its role in the regulation of developmental and adult physiology. Journal of Endocrinology, 232(2), R67-R81. https://doi.org/10.1530/JOE-16-0498

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