Full of valuable information. My highlights:
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Well-established environmental triggers for developing Hashimoto's in those who are genetically predisposed include iodine intake, bacterial and viral infections, hormonal imbalances, toxins, and therapy with certain types of medications.
In people with Hashimoto's, only 50 percent of their identical twins presented with thyroid antibodies, meaning genes alone are not the single defining factor and environmental triggers play a critical role.
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When scientists set the "normal" ranges of TSH for healthy individuals, they inadvertently included elderly patients and others with compromised thyroid function in the calculations, leading to an overly lax reference range. (see more regarding this on page 23)
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Some clinicians may only test for T4, but it is also important to test T3 as some individuals may not be properly converting T4 to the active T3. Some people may have a normal T4 but a low T3 level.
-more on this on p24
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High concentration of TPO antibodies has been associated with distress, obsessive-compulsive symptoms, and anxiety. This is like due to the increased amount of thyroid hormone being rushed into the bloodstream, causing a transient hyperthyroidism. Anyone who has experienced symptoms of hyperthyroidism can describe how agitating this feels. People with anxiety, depression, or other mood disorders should have their thyroid function checked, especially for TPO antibodies. Some individuals with lifelong psychiatric diagnoses have been able to recover after receiving proper thyroid care.
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Lifestyle interventions can also help with reducing TPO antibodies, reversing hypothyroidism and Hashimoto's, and preventing other diseases - and they make most people feel better. Some may be able to reduce and eliminate the need for thyroid medications when the autoimmune attack ceases and the thyroid gland is able to regenerate.
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"Autoimmune disease: because the only thing tough enough to kick my ass is me." - Unknown (header to chapter 4)
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The theory goes like this:
1) Thyroid cells are damaged by a trigger such as a toxin or an infection.
2) Dying thyroid cells send out a stress signal.
3) Immune cells rush in to "save" the thyroid from attackers.
4) Immune cells attack the thyroid instead.
5) More thyroid cell damage occurs.
6) Body runs out of resources to regenerate thyroid cells.
7) Thyroid is no longer able to produce enough hormone.
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When the intestinal wall becomes permeable, the body loses its ability to recognize benign substances such as our own cells and the foods we eat, instead treating them as though they were foreign invaders such as bacteria and viruses.
Zonulin is a recently discovered human protein that reversibly increases intestinal permeability. This protein in measured in excessive amounts in individuals with autoimmune conditions such as rheumatoid arthritis, Hashimoto's, multiple sclerosis, type 1 diabetes, and celiac disease.
p39
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Hashimoto's has been classified as a type IV hypersensitivity, which is called a delayed type hypersensitivity ("self-allergy"). Unlike other types of immune reactions, the damage to the thyroid tissue is not antibody-mediated; instead, the antibodies "mark" the thyroid cells, and then antigen-specific cytoxic T-lymphocytes (lymph cells) attack the targeted thyroid cells.
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However, examples of autoimmune recovery have discredited the "irreversible" aspect of this theory. It has been shown that continuous environmental triggers are necessary to perpetuate the process. This means the autoimmune process can be stopped and reversed when the triggers are eliminated. One example of this is celiac disease, an auto-immune condition in which gluten, and environmental trigger, has been identified. In most cases of classical celiac disease, all symptoms resolve when the environmental trigger (gluten) is removed.
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As we cannot change our genes, our approach to addressing the root cause of Hashimoto's is threefold:
1. Reducing triggers
2. Eliminating intestinal permeability
3. Providing the body with nutrients to regenerate
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Most antibiotics do not know the difference between the bad bacteria causing your infection and the good bacteria helping you with digestion and vitamin extraction as well as keeping peace within your intestinal track. . . . Since beneficial bacteria make up our immune system, antibiotic use is a suspected cause of increasing cases of allergies, chronic disease, autoimmune conditions, digestive issues, and even cancer.
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People with Hashimoto's are also five times more likely to be diagnosed with celiac disease. Recently, gluten intolerance has been described as a spectrum, with only the most severe cases of damage being diagnosed with celiac disease.
Additionally, some people with Hashimoto's may present with a celiac-like intolerance to milk proteins (whey and/or casein), egg proteins (ovalbumin), or soy proteins.
Many of these cases are undiagnosed, and when people continue to east foods they are sensitive to, they damage their intestines.
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The co-occurrence of Hashimoto's and celiac disease has been clearly established. I would even venture to say one does not need to have full-blown celiac to have impaired absorption of selenium.
Selenium plays a crucial role in thyroid function:
1. Acting as a catalyst to convert the inactive T4 to the biologically active T3
2. Protecting thyroid cells from oxidative damage from hydrogen peroxide by forming selnoproteins
p68
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One in four individuals in the general population may be zinc-deficient, and most people with hypothyroidism are. Zinc deficiency prevents the conversion of T4 into the active T3 version. This results in a slowed metabolism of proteins. Zinc is also needed to form TSH and may become depleted in those with hypothyroidism who are constantly producing more TSH.
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Genetic Causes of Nutrient Depletions
Some individuals with Hashimoto's may have a gene variation that prevents them from properly activating folic acid. This gene variation is present in up to 55 percent of the European populations and appears more commonly in those with hypothyroidism.
The gene involved in the MTHFR (methylenetetrahydrofolate reductase) gene, and genetic testing is available to show whether someone has this gene variation. The MTHFR gene codes for the MTHFR enzyme, which converts the amino acid homocysteine to methionine, a building block for proteins.
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Soy is one particular goitrogen that is especially detrimental for Hashimoto's patients. The isoflavones genistein, daidzein, and glycitein in soy reduce thyroid output by blocking activity of the TPO enzyme.
Soy has been linked with the development of autoimmune thyroid conditions, and children fed soy formula were almost three times more likely to develop anti-thyroid antibodies as compared with breast-fed children.
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Hashimoto's was not recognized in the United States before the nationwide salt iodization program began in 1924. In many other countries, studies have shown rates of autoimmune thyroiditis increased drastically after salt iodization programs.
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Researchers in Iran were able to document the rates of thyroid peroxidase antibodies (TPOAb) and thyroglobulin antibodies (TgAb) before and after a national salt iodization program started in 1994. In 1983-84, postiive TPOAb and positive TgAb were found in 3.2 percent and 4 percent of the 465 adults selected for random sampling in Tehran.
This sampling was repeated with 1,426 adults in Tehran in 1999-2000, this time showing 12.5 percent positive for TPOAb and 16.8 percent positive for TgAb. The addition of iodine quadrupled the rate of Hashimoto's within a six-year span!
Studies in Greece, China, Sri Lanka and Italy reported similar increases in Hashimoto's after the addition of iodine to salt.
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Considering that iodine increases the rate of Hashimoto's incidences - and even small doses of iodine can lead to the progression of thyroid abnormalities over a short period of time - it is no surprise that one in five women will have a thyroid dysfunction at some time in her life in the presence of iodized salt.
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The Standard American Diet exceeds the threshold of safe iodine consumption for those with autoimmune thyroid conditions.
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Many vegetable oils are made from genetically modified crops and contain large amounts of pesticides. When diets high in polyunsaturated fats were tested on animals, it was concluded that they can cause problems with learning, are toxic to the liver, trigger immune system malfunction, slow mental and physical growth, cause chromosomal damage, and induce premature aging. In addition, diets high in polyunsaturated fats are responsible for increased rates of cancer, heart disease, and weight gain.
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A variety of bacterial infections have been implicated in triggering autoimmune thyroiditis, including Helicobacter pylori (the same bacteria that causes ulcers), Borrelia burgdorferi (associated with Lyme disease), and Yersinia enterocolitica.
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Researchers have identified Mycoplasma, Candida, and Epstein-Barr virus as the infections most commonly associated with Hashimoto's.
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In the case of infections, once the infection is removed, TPO should cease to be a trigger when the immune system recognizes the infection is gone. Thus, treating infections may help heal Hashimoto's. In other cases, the infection may already be gone, but the immune system may need a reboot.
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Th1 and Th17 were both found in the thyroid cells of mice with Hashimoto's, and it is proposed that IL-17 cells are critical to the development of Hashimoto's.
New research suggests Th17 - rather than TH1 - may be causing the damage involved in the pathogenesis of Hashimoto's. This would explain why some Hashimoto's patients present with a mix of Th1 and Th2 dominance as well as with no clearly defined dominance.
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Dr. Fasano has identified that in the presence of leaky gut, we secrete excess zonulin, a protein that modulates the permeability between the right junctions. An excess of this protein has been found in every autoimmune condition, including Hashimoto's.
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These gram-negative bacteria are normally present in small amounts in the human intestine, but some individuals may have too mnay of them and not enough of the beneficial gram-positive bacteria. This produces and imbalance in bacterial gut flora known as gut dysbiosis.
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According to Elaine Gotschall, the author of Breaking the Viscious Cycle, a diet rich in refined carbohydrates can lead to a compromised GI flora. Anecdotal evidence shows that people who become affected with intestinal disorders are more likely to eat a diet high in simple carbohydrates compared with those who were unaffected.
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Stool tests are available to check microbial balance. These tests can tell us whether there is a lack of beneficial bacteria or an overabundance of pathogenic organisms such as potentially pathogenic gram-negative species or Candida.
p 142
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Symptom improvement in many autoimmune conditions has been reported after the initiation of a gluten-free diet. Length of gluten exposure is positively associated with the development of autoimmune conditions. This means the longer you eat gluten, the more likely you are to develop an autoimmune condition!
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Glutamine dosed daily (orally) at 0.5 grams/kg ideal* body weight for two months was shown to reduce intestinal permeability in subjects with Crohn's diease. Dr. Maes used a more conservative does of 7 grams a day.
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N-Acetyl Cysteine (NAC)
Hashimoto's patients are deficient in the antioxidant glutathione. It helps prevent free radical damage to the thyroid but isn't well-absorbed if taken orally. N-acetyl cysteine (NAC) is a precuror to glutathione and can be taken orally. NAC has been used for healing intestinal permeability. Be aware it can cause stomach upset if taken on an empty stomach and thus should be taken with food. Dr. Maes used a dose of 1.8 grams a day with chronic fatigue patients.
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Saccharomyces Boulardii
IgA levels can be increased by taking the beneficial yeast Saccharomyces boulardii, which helps clean up the intestines. S. boulardii does not take up residence in the intestines, but it does a lot of great work while passing through. S. boulardii can also help with clearing out yeasts, pathogenic bacteria, and parasites.
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Endotoxin from gram-negative bacteria can promote inflammation through the stimulation of Th1 pro-inflammatory cytokines (TNFa) in the intestine as well as in the rest of the body, especially in those with intestinal permeability. . . . Pro-inflammatory cytokines are seen with many autoimmune conditions, including Hashimoto's, type 1 diabetes, inflammatory bowel disease, and celiac disease. Endotoxin is thus being considered a promoter of autoimmune conditions.
p 157
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Intestinal damage due to gluten and other intolerances; low stomach acid; and other conditions commonly present in Hashimoto's put people at risk for malnutrition because of poor protein assimilation.
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Glycemic Burden
Researchers in Poland have found that up to 50 percent of patients with Hashimoto's have an impaired tolerance to carbohydrates. This means that after consuming carbohydrate-rich foods, their blood sugar levels spike, causing a substantial insulin release. The role of insulin is to clear blood sugar out of our cells, so a large insulin release is followed by a rapid blood sugar drop (hypoglycemia). . . Hypoglycemia necessitates the release of cortisol to help maintain the glucose supply to the brain and counteracts insulin, causing insulin resistance (this is also linked to the type 2 diabetes epidemic).
p171
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Inflammation
Chronic inflammation may result from joint pain, obesity, toxic burden, GI tract inflammation, irritable bowel disorder, pathogens in the GI tract, or food allergies. These conditions signal cortisol for its anti-inflammatory effect.
HPA Dysfunction and Autoimmunity
Some researchers believe HPA axis dysfunction and prolong cortisol elevation may be the cause, rather than the consequence, of autoimmune diseases. A natural steroid, cortisol suppresses cellular immunity (Th1), preventing tissue damage from excessive inflammation.
[See more on page 172]
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Subclinical Addison's
People with Hashimoto's and other autoimmune conditions are more likely to develop Addison's.
Co-occurring Addison's and Hashimoto's is known as Schmidt's disease, and any person with Hashimoto's who has anti-adrenal antibodies should be considered to have both conditions.
p 177-8
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It is unclear whether the cause of adrenal insufficiency or subclinical Addison's is due to depletion, down-regulation, or autoimmune origin, but it is evident adrenal and thyroid function have an impact on one another.
p178
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Chronic Viral Infections
Western Lifestyle and Autoimmune Coniditions
The "old friends" hypothesis proposes that Treg cells do not develop correctly because they are not exposed to parasites and other benign organisms that have coexisted with humans and coevolved with us to "teach" our immune system how to respond to threats.
In our modern-day world, where we receive vaccines, use antibacterial soaps, and take antibiotics, we are exposed to far fewer forms of bacteria, viruses and parasites. This, of course, has many benefits, especially in the case of becoming affected with serious infection. It appears, however, that we may also be missing out on exposure to organisms that may perhaps have had a beneficial effect on our immune system.
-read more on page 212
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Animal fat, broths, soups and stews support the body's ability to suppress the viruses. Monolaurin/lauric acid, one of the components of coconut oil, hasbeen found to be active against the Epstein-Barr virus. Replication of many viruses, including Epstein-Barr, is inhibited by glycyrrhizic acid, an active component of licorice root. Quercetin, co-enzyme Q10, n-acetyl cysteine, and glutathione were also reported to help fight chronic fatigue syndrome because of their antiviral properties.
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The most accurate test for allergies is a skin test in which an allergist scratches the surface of the skin with the allergen and observes for rashes to see if the person is reactive to the substance. Blood tests are also available but are less sensitive. This type of allergy is often called a "true allergy" by medical professionals.
This terminology is a misnomer, however, and suggests only IgE allergies exist and that reactions mediated by different parts of the immune system are nonexistent. Challenge any medical professional to review their Immunology course notes, and they will find that there are additional types of hypersensitivies just as "true" and "real" as IgE anaphylactic reactions. The two relevant hypersensitivies are mediated by immunoglobulins A and G, IgA and IgG respectively.
-read more on page 218
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IgA food intolerances may be asymptomatic, or they may present with the following symptoms: diarrhea, loose stools, constipation, acid reflux, malabsorption of nutrients from foods, and increased intestinal permeability.
They may cause IBS, gas, nausea, skin rashes (including eczema), acne, respiratory conditions such as asthma, nasal congestion, headache, irritability, and vitamin or mineral deficiencies.
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Accounting for 90 percent of food reactions, the most common food antigens are milk, eggs, peanuts, tree nuts (e.g. almonds, cashews, walnuts), fish, shellfish, soy and wheat.
Nightshades (e.g tomatoes, potatoes, peppers and eggplant), beef, citrus, corn, and pork may also be problematic.
p 222
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Starting in 1945, most American communities began adding fluoride to drinking water in an effort to prevent tooth decay. While various studies show fluoride reduces the incidence of dental cavities and tooth decay, fluoride is an endocrine disruptor. Studies confirm fluoride is directly toxic to thyroid cells and causes thyroid cell death, suppressing thyroid activity.
In fact, fluoride was actually used to treat hyperthyroidism up until the 1950s, prior to the development of other thyroid-suppressing medications. Fluoride is effective as a thyroid suppressor at doses of 0.9 to 4.2 mg per day for hyperthyroidism. Most adults in fluoridated communities are ingesting between 1.6 and 6.6 mg of fluoride per day from water, inadvertently suppressing their thyroid function.
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Fluoridation partially began as a collaborative effort between dental associations, the US government, and sugar lobbyists who wanted to find a solution that would allow people to have fewer cavities while continuing to consume the same amount of sugar.
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The United States is one of the only countries that adds fluoride to its water system. Almost all (97 percent) European countries have rejected water fluoridation due to the toxicity associated with it. Austria, France, Germany, Spain, and Switzerland, however, do allow the addition of fluoride to salt.
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Acid-Alkaline Food Balance
Creating a more alkaline environment in the body may help with the detoxification process and can improve alkaline phosphatase function. While this initially seems to contradict the previous recommendation to increase stomach acidity, it does not. Keeping the stomach acidic and the rest of the body alkaline is the key to optimal health and can be achieved through diet and digestive enzymes.
p 246
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One thing to remember about overcoming Hashimoto's is it takes years to develop the perfect storm to produce Hashimoto's thyroiditis. In the same way, healing won't happen overnight.