The Mighty Thyroid and its Need for Iodine
Think of your thyroid gland as the engine of your body. It produces hormones, primarily thyroxine (T4) and triiodothyronine (T3), that control your metabolism, influencing everything from your heart rate and body temperature to your energy levels. To
make these essential hormones, the thyroid requires iodine, a trace element our bodies cannot produce on our own. This means we must get it from our diet. When iodine intake is insufficient, the thyroid struggles to produce the hormones the body needs, setting the stage for a range of health issues.
Recognising the Signs of Iodine Deficiency
Iodine deficiency is a leading cause of preventable brain damage worldwide, especially in newborns and children. The most well-known sign is a goitre, which is a visible swelling of the neck due to an enlarged thyroid gland. Other common symptoms include unexplained weight gain, persistent fatigue and weakness, hair loss, dry and flaky skin, and feeling unusually cold. Some people may also experience changes in their heart rate or find it difficult to learn and remember things. In women, it can lead to heavy or irregular periods. Because these symptoms can be subtle or mistaken for other conditions, awareness is key.
How Much Iodine Do You Need?
The amount of iodine you need is surprisingly small, measured in micrograms (mcg). For most adults, the recommended daily allowance is about 150 mcg. This need increases significantly during pregnancy and lactation, to around 220-290 mcg per day, to support the brain and bone development of the foetus and newborn. Getting enough iodine is crucial during these life stages to prevent developmental delays and cognitive impairment in children.
Finding Iodine in the Indian Diet
Fortunately, meeting your daily iodine needs is achievable with a balanced diet. The simplest and most effective source is iodized salt, a cornerstone of India’s public health strategy. Beyond salt, good sources include dairy products like milk, curd (yogurt), and paneer (cheese). Seafood, such as fish and shrimp, is naturally rich in iodine. Eggs are also a reliable source. For those following vegetarian or vegan diets, options include potatoes (especially with the skin), lentils, beans, prunes, and bananas, although these contain smaller amounts. Fortified foods and certain plant-based milks can also contribute.
India's Fight Against Deficiency
India's soil is naturally low in iodine, which historically made iodine deficiency disorders (IDD) a major public health problem across the country. In response, the government launched the National Goitre Control Programme in 1962, which was later expanded and renamed the National Iodine Deficiency Disorders Control Programme (NIDDCP). The core strategy has been Universal Salt Iodization (USI), which involves fortifying all edible salt with iodine. This programme has been a remarkable success, with studies showing that over 90% of Indian households now consume iodized salt, dramatically reducing the prevalence of goitre and other related disorders.
Can You Have Too Much Iodine?
While deficiency is a concern, it is also possible to consume too much iodine, though this is uncommon. The relationship between iodine and thyroid health is often described as U-shaped: too little is harmful, but too much can also cause problems. Excessive intake, usually from high-dose supplements, can sometimes lead to hyperthyroidism (an overactive thyroid) or, paradoxically, hypothyroidism. Susceptible individuals, such as the elderly or those with pre-existing thyroid conditions, are more at risk. For most people, getting iodine from a balanced diet rather than high-dose supplements is the safest approach.
