Thyroid Health and Your Diet: An India-First Guide

Thyroid disorders affect women far more than men - in India, up to 1 in 10 women has some form of thyroid dysfunction, with many more going undiagnosed. The thyroid gland produces hormones that regulate metabolism, body temperature, heart rate, mood, and the menstrual cycle. While thyroid disorders require medical diagnosis and, when necessary, medication*, nutrition plays a meaningful supporting role.

Hypothyroidism vs Hyperthyroidism

Hypothyroidism (underactive thyroid) means the thyroid is not producing enough hormones. It is the more common condition in India, frequently caused by Hashimoto's thyroiditis - an autoimmune condition. Symptoms include fatigue, weight gain, feeling cold, constipation, dry skin, hair loss, and irregular periods. Hyperthyroidism (overactive thyroid) brings weight loss, feeling hot, rapid heartbeat, anxiety, and light periods.

Iodine: Still Relevant

Iodine is the raw material for thyroid hormones. India's mandatory salt iodisation programme, introduced in the 1980s, dramatically reduced deficiency. But iodine-deficient soil remains a problem in certain inland and mountainous regions. For most urban Indian women eating a varied diet with iodised salt, iodine deficiency is not a major concern. But if you live in a high-risk area or avoid iodised salt, it is worth checking.

Goitrogens: Should You Worry?

Goitrogens - compounds in cruciferous vegetables like cabbage, cauliflower, and radish - can theoretically interfere with thyroid hormone production. This has led to widespread advice to avoid these vegetables with hypothyroidism. The evidence for this concern is weak in people with adequate iodine intake. Cooking these vegetables significantly reduces their goitrogenic activity. The nutritional benefits of cruciferous vegetables far outweigh the theoretical risk for most people.

Soy and Thyroid Medication

Soy isoflavones can interfere with thyroid hormone absorption - primarily relevant if you take levothyroxine*. Taking your thyroid medication on an empty stomach, at least 30-60 minutes before eating soy-containing foods, minimises this interaction. Moderate soy consumption is generally considered safe for people with well-controlled hypothyroidism.

Anti-Inflammatory Eating for Autoimmune Thyroid Disease

Since Hashimoto's and Graves' disease are autoimmune conditions, an anti-inflammatory dietary approach may help. Emphasise omega-3-rich foods (flaxseeds, walnuts, fatty fish), colourful vegetables and fruits, and limit ultra-processed foods, excess sugar, and refined carbohydrates. The evidence for strict gluten elimination in people without coeliac disease is limited, but some women with Hashimoto's do find it helpful.