High Cholesterol and Thyroid: What’s the Connection?
If you’ve ever had your cholesterol checked and been surprised by high numbers, your thyroid might be the missing piece of the puzzle. While diet and lifestyle play a role in cholesterol levels, an underactive thyroid (hypothyroidism) can also be a major culprit. Let’s dive into the link between high cholesterol and thyroid function—and what you can do about it.
How Your Thyroid Affects Cholesterol
Your thyroid gland produces hormones (T3 and T4) that help regulate metabolism, including how your body processes fats. When your thyroid function is low, metabolism slows down, and the body struggles to clear cholesterol from the bloodstream efficiently. This often leads to elevated LDL (“bad” cholesterol) and triglycerides.
Signs Your Thyroid Might Be to Blame
If you have high cholesterol and experience any of the following symptoms, it’s worth investigating your thyroid health:
Fatigue
Weight gain
Dry skin
Hair thinning
Sensitivity to cold
Brain fog
Constipation
Why Conventional Cholesterol Tests Don’t Tell the Whole Story
Many people are prescribed statins (cholesterol-lowering drugs) without checking thyroid function. If your high cholesterol is caused by hypothyroidism, treating the root cause—your thyroid—may naturally bring your cholesterol into balance without the need for medication.
What Labs Should You Check?
If you have high cholesterol, ask for a full thyroid panel, including:
TSH (Thyroid-Stimulating Hormone) – High levels may indicate hypothyroidism.
Free T3 & Free T4 – These measure your active thyroid hormones.
Reverse T3 – High levels can indicate poor thyroid hormone conversion.
Thyroid Antibodies (TPO & TGAb) – Can help diagnose Hashimoto’s, an autoimmune thyroid condition.
How to Support Your Thyroid and Cholesterol Naturally
If your thyroid is underperforming, addressing it may help lower cholesterol levels. Here’s what you can do:
Prioritise Nutrient-Rich Foods
Selenium (found in Brazil nuts)
Iodine (seaweed, iodised salt)
Zinc (pumpkin seeds, oysters)
Omega-3s (fatty fish, flaxseeds)
Balance Blood Sugar
Reduce refined carbs and sugar
Eat protein and healthy fats with every meal
Avoid ultra-processed foods
Support Liver Function
The liver helps convert T4 into active T3.
Focus on liver-friendly foods like cruciferous vegetables, lemon water, and bitter greens.
Manage Stress
Chronic stress increases cortisol, which can suppress thyroid function.
Try breathwork, meditation, or gentle movement.
Consider Thyroid-Supportive Supplements
Work with a qualified naturopath to determine if you need iodine, selenium, or adaptogens.
If you’re struggling with high cholesterol and haven’t looked into your thyroid, it’s time to connect the dots. A sluggish thyroid can be a hidden driver of cholesterol imbalances, and addressing it can lead to better heart health, metabolism, and overall well-being. If this sounds like you, consider getting a full thyroid panel and working with a naturopath who understands the big picture.
Looking for expert guidance on your thyroid and cholesterol? Book a consultation with Wholme Naturopathy today and take charge of your health!