When it comes to essential nutrients, iodine often flies under the radar. Yet, this trace mineral is particularly important for thyroid function and overall metabolism. Despite its importance, iodine deficiency remains surprisingly common worldwide, and the UK is no exception.
A 2016-2018 national survey reported that 17% of UK women aged 16 to 49 were iodine-deficient. Among pregnant women, studies also consistently show mild-to-moderate iodine deficiency.
It’s easy to assume we’re getting enough iodine from our diet. But the reality is that modern eating habits and soil depletion have made it increasingly difficult to maintain adequate levels. In turn, this impacts your overall health and well-being. So, let’s take a closer look.
What Causes Iodine Deficiency?
Unlike many countries, the UK doesn’t have mandatory iodine fortification programmes for salt or other staple foods. This leaves many people unknowingly deficient until symptoms arise.
Interestingly, soil depletion also plays a significant role here. Modern farming practices have stripped many soils of their natural iodine content, and this means that fruits and vegetables now contain significantly less iodine than they did decades ago.
Certain dietary choices can further interfere with iodine absorption. Cruciferous vegetables like broccoli, cabbage, and kale—whilst healthy in many ways—contain compounds called goitrogens that can block iodine uptake when consumed in large quantities. Similarly, excessive consumption of processed foods, which often lack iodine, can crowd out more nutrient-dense options from your diet.
It’s also worth noting that pregnancy and breastfeeding significantly increase iodine requirements, making deficiency more likely. Unfortunately, many prenatal supplements don’t contain adequate iodine levels, leaving expectant mothers at risk.
The Benefits of Iodine
Ensuring adequate iodine intake supports numerous aspects of your health, with effects beyond just thyroid function. Here are the top benefits of this small but mighty mineral:
Contributes to Thyroid Health and Metabolism
Starting with the basics: Your thyroid gland requires iodine to produce thyroid hormones, which regulate your metabolism, body temperature, and energy levels. Without sufficient iodine, your thyroid simply can’t function properly. In turn, deficiency or inadequate absorption can lead to fatigue, weight gain, and brain fog.
Improves Cognition
Adequate iodine is essential for brain development and cognitive function throughout life. In fact, a deficiency during pregnancy can impact fetal brain development. Meanwhile, an ongoing deficiency in adults may affect concentration, memory, and mental clarity.
Enhances Immunity
Iodine possesses natural antibacterial and antiviral properties. It may further help maintain healthy mucous membranes and may reduce the risk of certain infections.
Iodine-Rich Foods to Include in Your Diet
Iodine deficiency, ultimately, must be determined by your doctor, often through a series of blood or urine tests. And fortunately, incorporating iodine-rich foods into your daily routine can help maintain adequate levels and is relatively easy.
Some iodine-rich foods include:
- Seaweed and sea vegetables (kelp, nori, and akame)
- Fish and seafood (cod, tuna, shrimp, and salmon)
- Milk
- Cheese
- Yogurt
- Eggs
Adult men and women typically need around 150 micrograms of iodine per day to support healthy thyroid function and hormone production. To put it into perspective, you could meet your daily needs by eating a serving of cod (85g), which contains about 99 mcg, a boiled egg (24 mcg), and a small bowl of yogurt (40-50 mcg).
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