Many people don’t realize the far reaching effects that your thyroid can have on your general health. Most of us know that your thyroid is connected to your metabolism, your energy level and your ability to gain or lose weight. But, did you know that there are many other effects of suboptimal thyroid function? In addition, the prevalence of thyroid dysfunction in United States is widespread; as many as one in seven Americans have thyroid glands the don’t work as well as they should.

Thyroid function is also very important for heart health. We have two major thyroid hormones in our body, T4 and T3. The thyroid gland normally secretes about 90 percent T4, which has some activity. However, our body usually converts T4 to T3, which has five times more activity! This conversion is dependent on some nutrients like selenium and doesn’t happen as readily if you have a lot of stress. Therefore, many of us don’t convert our T4 hormone to the more active T3. Also, this inability to convert T4 to T3 may not show up with routine testing for thyroid function such as TSH (thyroid stimulating hormone). 

Not only does this affect your metabolism, it can affect your heart.

Decreased T3 production will raise your low-density lipoprotein (LDL), or bad cholesterol, due to decreased metabolism of fats. Decreased T3 also reduces the availability of your essential fatty acids, EPA and DHEA, which reduce inflammation and help to protect your heart. You can also obtain essential fatty acids by eating cold water fish such as mackerel and salmon and supplementing with a good-quality fish oil. But, it’s important to make sure your thyroid is functioning well so you have as much of the heart healthy EPA and DHA available as you can. Because inadequate T3 lowers your metabolism, it reduces the rate at which you burn oxygen. That can contribute to free radical damage to your heart.

If you have any symptoms of low thyroid such as weight gain, fatigue, hair loss, constipation, dry hair and skin or difficulty concentrating, call your physician and ask for thyroid testing that includes TSH, free T3, free T4, reverse T3 and thyroid antibody testing.