Hypothyroidism - Causes and Treatment

Causes and Treatment of Hypothyroidism

What is Hypothyroidism?

            Hypothyroidism is a medical condition, rather than a standalone disease, in which the thyroid gland is unable to produce enough thyroid hormones. As a result, individuals affected by it tend to experience severe fatigue, sudden weight gain, and cold intolerance.

Common Causes of Hypothyroidism

• Hashimoto's Disease: This is the most common cause. It is an autoimmune disorder in which the body's immune system mistakenly attacks and damages the thyroid gland.
• Thyroid Surgery or Radiation: Partial or total removal of the thyroid gland, or radiation therapy to the neck region for cancer treatment, is a primary cause. These interventions drastically reduce or completely stop hormone production.
• Thyroiditis: This condition involves inflammation of the thyroid gland, which causes stored hormones to leak out. This depletion ultimately leads to an underactive thyroid gland.
• Iodine Deficiency: Hypothyroidism can occur due to an inadequate intake of iodine. Iodine is an essential component required for the proper synthesis of thyroid hormones in the human body. However, this cause is rare in many developed countries due to iodised salt.
• Medications and Pituitary Disorders: Certain drugs, such as lithium, or disorders related to the pituitary gland can interfere with the normal functioning of the thyroid gland.

Treatment for Hypothyroidism

• Hormone Replacement Therapy

          The primary treatment for managing hypothyroidism involves lifelong daily medication with a synthetic thyroid hormone, such as levothyroxine. This tablet is typically taken on an empty stomach to restore normal hormone levels. Doctors frequently prescribe specific brands, like Thyronorm, in varying milligram (mg) dosages tailored to the severity of the hormone deficiency.

• Regular Monitoring

         Doctors use periodic blood tests to monitor thyroid levels and adjust the medication dosage as and when required.

Note on TSH

          TSH stands for Thyroid Stimulating Hormone (also known as thyrotropin). It is a
hormone produced by the pituitary gland in the brain that signals the thyroid gland in the neck to produce the correct amount of thyroid hormones.

          TSH acts as the primary messenger controlling the body's overall metabolism, energy levels, and heart rate. The pituitary gland functions like a thermostat for thyroid hormones (T3 and T4):

• When T3 and T4 levels are too low: The pituitary gland releases more TSH to signal the thyroid gland to work harder. If these TSH levels remain consistently high, it indicates hypothyroidism.
• When T3 and T4 levels are too high: The pituitary gland releases less TSH to signal the thyroid gland to slow down production, a state associated with hyperthyroidism.

What is a TSH Test?

A TSH test is a standard blood test used by doctors to measure the concentration of TSH in the bloodstream. It is generally used to quickly diagnose whether the thyroid gland is overactive or underactive.

• High TSH levels usually indicate an underactive thyroid (Hypothyroidism).
• Low TSH levels usually indicate an overactive thyroid (Hyperthyroidism).

Best Diet for Hypothyroidism

Thyroid hormones help manage several bodily functions, including growth, cell repair, and metabolism.

Medication is the primary treatment for hypothyroidism, but eating a balanced and nutritious diet can help reduce symptoms and support overall health.

Foods to Eat and Avoid During Hypothyroidism

Which nutrients are important for people suffering from hypothyroidism?

1. Iodine: Iodine is an essential mineral required to produce thyroid hormones. Iodine deficiency is the most common cause of hypothyroidism worldwide. Although iodine deficiency is rare in developed nations, certain populations in developing countries are highly prone to it, including:

• People who avoid iodized salt.
• Pregnant women.
• People following strict vegan diets.

2. Selenium: Selenium is an essential micronutrient that supports the healthy production of thyroid hormones. It also protects the thyroid from damage caused by oxidative stress. Adding selenium-rich foods to your daily diet can optimize these levels. Good sources include:

• Brazil nuts (plant-based)
• Tuna (animal-based)
• Sardines (animal-based)
• Eggs (animal-based)
• Legumes (pulses and dried seeds)

Note: The National Institutes of Health (NIH) sets the daily upper limit for selenium in adults at 400 mcg. Avoid excessive intake, as high consumption can lead to serious medical complications and organ system distress, along with hair and nail loss, diarrhea, and skin rashes.

3. Zinc: The body requires zinc for thyroid hormone production and proper thyroid function. Not getting enough zinc can negatively affect thyroid health. Furthermore, a zinc deficiency can worsen the severity of hypothyroidism.

Other important nutrients include:

• Vitamin D: Vitamin D deficiency is a risk factor for autoimmune thyroid conditions, including hypothyroidism. Low levels can negatively affect thyroid function. While sunlight provides vitamin D, it is scarce in foods, meaning people often require vitamin D supplements.
• Vitamin B12: Vitamin B12 deficiency is common among individuals with hypothyroidism. Doctors frequently recommend vitamin B-enriched foods or B12/B-complex supplements.
• Magnesium: Low magnesium levels may cause thyroid dysfunction. Adding magnesium-rich foods or supplements to your routine can improve hypothyroid symptoms.
• Iron: Iron deficiency or anemia can disrupt proper thyroid function. Incorporating iron-rich foods or iron supplements is necessary to maintain recommended levels.

Other nutrient deficiencies that may contribute to hypothyroidism include:

• Vitamin A
• Folate
• Calcium

Foods to Limit or Avoid If You Have Hypothyroidism

1. Ultra-Processed Foods: Ultra-processed foods can increase inflammation and oxidative stress in the body. Oxidative stress refers to an excess of free radicals that overwhelm the body's antioxidant defenses, leading to cellular damage. Avoid foods such as:

• Processed snacks like potato chips.
• Sodas and sweetened drinks.
• Sweetened breakfast cereals.
• Flavored granola bars containing preservatives.

Gluten: Gluten is a group of proteins found in wheat, barley, triticale, and rye. If you have a sensitivity to gluten, doctors will recommend a gluten-free diet. However, it is best to consult with a doctor or dietitian before drastically changing your eating plan.

Goitrogens: Goitrogens are substances present in soy products and cruciferous vegetables like cabbage and Brussels sprouts. Some research suggests they may interfere with thyroid hormone production.

Goitrogenic foods to monitor include:

1. Cabbage
2. Kale
3. Brussels sprouts
4. Soy products
5. Cauliflower
6. Pearl millet
7. Broccoli

However, according to a 2024 review of research, these foods may not have the negative effect on thyroid function indicated by older studies. Consult your doctor before completely eliminating them from your diet.

Foods to Add If You Have Hypothyroidism

If you are diagnosed with hypothyroidism, try adding the following nutritious options to your diet:

1. Fruits: Berries, apples, peaches, pears, grapes, bananas, and citrus fruits like lemon, sweet lime, and pineapple.
2. Non-Starchy Vegetables: Leafy greens, zucchini, asparagus, carrots, peppers, spinach, and mushrooms.
3. Starchy Vegetables: Sweet potatoes, potatoes, peas, and butternut squash.
4. Lean Fish, Eggs, Meat, and Poultry: Fish, shellfish, eggs, turkey, and chicken.
5. Healthy Fats: Olive oil, avocados, avocado oil, coconut oil, unsweetened coconut, or full-fat yogurt.
6. Whole Grains: Brown rice, rolled oats, quinoa, and brown rice pasta.
7. Seeds, Nuts, and Nut Butters: Almonds, cashew nuts, macadamia nuts, pumpkin seeds, and natural peanut butter.
8. Beans and Lentils: Chickpeas, kidney beans, and various lentils.
9. Dairy and Non-Dairy Substitutes: Coconut milk, cashew milk, coconut yogurt, almond milk, unsweetened yogurt, or cheese.
10. Spices, Herbs, and Condiments: Spices like paprika, saffron, or turmeric; fresh or dried herbs like basil or rosemary; and light condiments like mustard.
11. Beverages: Water, unsweetened tea, coffee, or sparkling water.

Diet and Thyroid Medication

Ensure you take your thyroid medication on an empty stomach for optimal absorption. Avoid foods, beverages, and supplements close to your dose time, as they can interfere with how your body processes the medicine.

Note: Experts suggest taking thyroid medication at least 30 to 60 minutes before breakfast, or 3 to 4 hours after dinner. Wait at least 30 minutes before consuming any food or drinks other than water—including caffeinated beverages, which significantly reduce absorption.

Conclusion

There is no single "best" diet for hypothyroidism. However, getting the right nutrients alongside regular medication can manage symptoms, improve thyroid function, and enhance overall well-being.