Thyroid Nutrition: What to Eat and Avoid With Hypothyroidism or Hyperthyroidism

The thyroid is a small gland with a major role in metabolism, energy balance, and hormone regulation. When conditions such as hypothyroidism or hyperthyroidism develop, nutrition may help support overall well-being alongside medical treatment.

Although diet does not replace professional care, healthy eating habits may contribute to better thyroid health.

What Is Hypothyroidism?

Hypothyroidism occurs when the thyroid produces fewer hormones than the body needs, slowing down metabolism.

Common symptoms include:

• Fatigue

• Weight gain

• Sensitivity to cold

• Dry skin

• Constipation

• Hair loss

What Is Hyperthyroidism?

Hyperthyroidism happens when the thyroid produces excessive hormones, speeding up many body functions.

Common symptoms may include:

• Unintentional weight loss

• Nervousness or anxiety

• Rapid heartbeat

• Excessive sweating

• Sleep problems

• Muscle weakness

Important Nutrients for Thyroid Health

Certain nutrients play an important role in thyroid function and may support a balanced nutrition plan.

Iodine

Iodine is necessary for thyroid hormone production. Common sources include:

• Fish and seafood

• Dairy products

• Eggs

• Iodized salt

However, excessive iodine intake may also be harmful in some thyroid conditions.

Selenium

Selenium helps support thyroid hormone conversion and protection.

Good food sources include:

• Brazil nuts

• Tuna

• Eggs

• Legumes

Zinc and Iron

These minerals also contribute to hormone and metabolic functions.

They can be found in:

• Lean meats

• Seeds

• Beans

• Spinach

Foods to Prioritize

A balanced eating plan that supports thyroid health typically includes:

• Fruits and vegetables

• Lean proteins

• Healthy fats

• Whole grains

• Fiber-rich foods

Regular meal timing and proper hydration may also be beneficial.

Foods to Limit or Avoid

Depending on the diagnosis and medical guidance, some people may benefit from limiting:

• Ultra-processed foods

• Added sugars

• Excess alcohol

• Excess caffeine

• Excessive iodine intake

In some cases, raw cruciferous vegetables such as cabbage, broccoli, or cauliflower may be moderated, although they are generally considered healthy when cooked and consumed in normal amounts.

Conclusion

Hypothyroidism and hyperthyroidism may affect energy levels, metabolism, and overall quality of life. A balanced nutrition plan tailored to individual needs may help support wellness and complement medical treatment.