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Sugar's Impact on Thyroid Health

Know how sugar impacts thyroid health in various ways. Learn about foods that help in keeping proper thyroid function and foods that should be avoided.

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Written by Dr. Mohammed Kamran

Reviewed by Dr. Vasanthasree Nair MBBS

Last updated on 31st Jul, 2025

Introduction

Your thyroid is a small organ that plays a huge role in regulating your metabolism, energy levels, and overall health. When your thyroid isn’t functioning properly, it can lead to conditions like hypothyroidism or hyperthyroidism.

One factor that often goes unnoticed in thyroid health is sugar consumption. While sugar is a common part of our diets, excessive intake can negatively affect thyroid function and worsen symptoms in people with thyroid disorders.

Let’s explore how sugar impacts thyroid health and what you can do to support your thyroid naturally.

Consult a Top diabetic specialist

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Dr. Prithvi Raj

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Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

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Dr. Arthi S, Family Physician

Dr. Arthi S

Family Physician

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Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

Dr. Ankitha, Internal Medicine Specialist Diabetologist

Dr. Ankitha

Internal Medicine Specialist Diabetologist

6 Years • MD INTERNAL MEDICINE

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

recommendation

85%

(25+ Patients)

550

Dr Venkata Naga Sai Tribhushan Rambhatla, General Physician

Dr Venkata Naga Sai Tribhushan Rambhatla

General Physician

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PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

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Dr. Anand Ravi, General Physician

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2 Years • MBBS

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How Does Sugar Affect the Thyroid?

1. Increases Inflammation

Excess sugar triggers chronic inflammation, which can interfere with thyroid hormone production. Inflammation may also contribute to autoimmune thyroid disorders like Hashimoto’s thyroiditis (a common cause of hypothyroidism).

2. Disrupts Hormone Balance

High sugar intake can lead to insulin resistance, which affects how your body processes hormones, including thyroid hormones. This imbalance can make thyroid disorders harder to manage.

3. Weakens the Immune System

Too much sugar weakens immunity, making it harder for your body to fight infections or autoimmune reactions that target the thyroid.

4. Contributes to Weight Gain

Thyroid disorders, especially hypothyroidism, often cause weight gain and sluggish metabolism. Excess sugar adds to this problem by increasing fat storage and cravings.

5. Causes Energy Crashes

People with thyroid issues often experience fatigue. While sugar may give a quick energy boost, it leads to energy crashes, making fatigue worse.

Symptoms of Thyroid Dysfunction

If you have a thyroid disorder, you may experience:

Hypothyroidism: 

  1. Fatigue

  2. Weight gain

  3. Cold intolerance

  4. Dry skin and hair

  5. Depression

  6. Constipation

Hyperthyroidism:

  1. Weight loss

  2. Rapid heartbeat

  3. Anxiety

  4. Tremors

  5. Excessive sweating

If you notice these symptoms, consult a doctor for proper testing.

How to Reduce Sugar for Better Thyroid Health

1. Cut Down on Refined Sugar

Avoid sugary drinks, desserts, and processed foods. Instead, opt for natural sweeteners like honey (in moderation), stevia, or dates.

2. Eat Balanced Meals

Include protein, healthy fats, and fibre in every meal to stabilise blood sugar and reduce cravings.

3. Choose Low-Glycemic Foods

Foods with a low glycemic index (GI) release sugar slowly, preventing spikes. Examples:

  1. Whole grains (oats, quinoa)

  2. Nuts and seeds

  3. Leafy greens

4. Stay Hydrated

Dehydration can mimic hunger and increase sugar cravings. Drink enough water, herbal teas, or infused water instead of sugary beverages.

5. Manage Stress

Stress increases cortisol, which can worsen thyroid function and sugar cravings. Try yoga, meditation, or deep breathing exercises.

6. Get Enough Sleep

Poor sleep disrupts hormones, including those regulating hunger and thyroid function. Aim for 7-9 hours of quality sleep nightly.

Thyroid-Friendly Diet Tips

Foods to Eat:

Some of the best foods for thyroid-friendly include:

  1. Iodine-rich foods (seaweed, fish, eggs) support thyroid hormone production.

  2. Selenium-rich foods (Brazil nuts, sunflower seeds) – help convert thyroid hormones.

  3. Zinc-rich foods (pumpkin seeds, lentils) – essential for thyroid function.

  4. Anti-inflammatory foods (berries, turmeric, leafy greens) – reduce thyroid inflammation.

Foods to Avoid or Limit:

The foods which can be avoided or limited include:

  1. Processed sugars and artificial sweeteners

  2. Refined carbs (white bread, pasta)

  3. Soy products (in excess) may interfere with thyroid function.

  4. Excessive caffeine can stress the adrenal glands.

When to See a Doctor?

If you experience persistent fatigue, unexplained weight changes, or other thyroid-related symptoms, consult a doctor. Thyroid function tests (T3, T4, TSH) can help diagnose any issues.

Final Thoughts

Sugar triggers inflammation, which affects thyroid function. The symptoms include fatigue, weight gain or loss, etc. The best way to stop this is by following a lifestyle which ensures this does not happen, stay hydrated, eat a balanced diet and cut down on sugars. Follow a healthy diet to stay healthy and keep your thyroid function well. 

Consult a Top diabetic specialist

Dr. Prithvi Raj, General Physician/ Internal Medicine Specialist

Dr. Prithvi Raj

General Physician/ Internal Medicine Specialist

5 Years • MBBS, MD

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

550

Dr. Arthi S, Family Physician

Dr. Arthi S

Family Physician

3 Years • MBBS

Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

Dr. Ankitha, Internal Medicine Specialist Diabetologist

Dr. Ankitha

Internal Medicine Specialist Diabetologist

6 Years • MD INTERNAL MEDICINE

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

recommendation

85%

(25+ Patients)

550

Dr Venkata Naga Sai Tribhushan Rambhatla, General Physician

Dr Venkata Naga Sai Tribhushan Rambhatla

General Physician

3 Years • MBBS

Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

Dr. Anand Ravi, General Physician

Dr. Anand Ravi

General Physician

2 Years • MBBS

Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

Consult a Top diabetic specialist

Dr. Prithvi Raj, General Physician/ Internal Medicine Specialist

Dr. Prithvi Raj

General Physician/ Internal Medicine Specialist

5 Years • MBBS, MD

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

550

Dr. Arthi S, Family Physician

Dr. Arthi S

Family Physician

3 Years • MBBS

Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

Dr. Ankitha, Internal Medicine Specialist Diabetologist

Dr. Ankitha

Internal Medicine Specialist Diabetologist

6 Years • MD INTERNAL MEDICINE

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

recommendation

85%

(25+ Patients)

550

Dr Venkata Naga Sai Tribhushan Rambhatla, General Physician

Dr Venkata Naga Sai Tribhushan Rambhatla

General Physician

3 Years • MBBS

Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

Dr. Anand Ravi, General Physician

Dr. Anand Ravi

General Physician

2 Years • MBBS

Bengaluru

PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru

400

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