Iodine is much more than just a trace element in the home medicine cabinet. It is the invisible pacemaker of our body, which largely determines how much energy is available to us and how well our metabolism functions. In Germany, iodine deficiency was long underestimated as a major health problem, but even today, optimal supply for the population is of central importance. This article explains why the thyroid gland depends on iodine, how the daily requirement is met, and what you should pay attention to in your diet.
The path of iodine in the body: From the thyroid gland to the hormones T3 and T4 and then to the most important metabolic and growth processes.
The thyroid gland acts as a kind of control center for our body. To fulfill its tasks, it produces vital thyroid hormones. The storage hormone thyroxine (T4) and the metabolically active triiodothyronine (T3) contain iodine atoms in their structure. Without a sufficient supply of this trace element, the thyroid gland cannot synthesize these hormones in sufficient quantities. This has a direct impact on the vitality of the entire body.
Iodinated thyroid hormones regulate almost all metabolic processes. They influence heart rate, body temperature, and energy expenditure. Our nervous system also depends on a stable hormonal balance. A deficiency can therefore quickly become noticeable through concentration problems, lack of motivation, or mood swings.
Iodine is especially essential during growth phases. Thyroid hormones promote protein synthesis in the body, which is crucial for muscle growth and cell regeneration. The health of the skin, hair, and nails also depends directly on optimal iodine supply and the associated metabolic rate.
The requirement for iodine varies depending on age and physiological condition. The German Nutrition Society (DGE) recommends a daily iodine intake of approximately 200 micrograms (µg) for healthy adults. For children, the requirement is slightly lower depending on age, while it increases significantly for specific population groups.
Pregnant and nursing mothers have a massively increased requirement, as they must support not only their own metabolism but also the development of the fetus or infant. Undersupply during pregnancy can impair the child's cognitive development. Here, targeted intake is often necessary in consultation with the gynecologist.
The European Food Safety Authority (EFSA) sets upper limits to prevent hyperthyroidism caused by iodine overdose. For healthy adults, the safe upper limit is 600 µg per day. Those who take dietary supplements should keep this value in mind.
Due to the last ice age, many iodine compounds were washed out of German soils. Since plants absorb iodine from the soil, plant-based foods grown domestically are naturally low in iodine. This makes Germany a geographical iodine deficiency area, which in the past often led to massive health problems.
Today's iodine supply in the population has improved through indirect routes. Since livestock is now fed iodinated feed, dairy products, meat, and eggs contain significantly more iodine than before. This "detour" through animal husbandry is now a major pillar of iodine intake in Germany.
Although Germany is no longer considered a classic iodine deficiency area by the World Health Organization (WHO), supply is still suboptimal. Many people, especially adolescents and seniors, do not consistently reach the recommended target values.
In cases of prolonged deficiency, the thyroid gland tries to compensate for the deficit through cell growth. The result is an enlargement of the organ, known as goiter (Struma). The formation of nodules is also promoted by iodine deficiency.
Classic hypothyroidism is accompanied by a slowed metabolism. Those affected suffer from constant fatigue, increased sensitivity to cold, weight gain, and poor concentration.
Since iodine is essential for the myelination of nerve pathways, sufficient iodine intake during early childhood development is absolutely critical. Severe deficiency can lead to irreversible intellectual developmental delays.
Chronic iodine deficiency impairs the overall hormone balance, which can reduce fertility and increase the risk of metabolic diseases in the long term.
Seafood such as cod, salmon, or plaice are the best natural sources of iodine. They should be on the menu at least once or twice a week.
The use of iodized table salt in households and the food industry is the most effective way to ensure basic supply. Iodinated foods are becoming increasingly important in Germany, and salt with iodine is an advantage for most people due to the nutrient-poor soils. Foods containing "iodine and fluoride" or simply "iodized salt" can provide real added value.
Algae are extremely rich in iodine, but caution is advised: The iodine content fluctuates massively. Excessive consumption can trigger hyperthyroidism, especially in people with a pre-existing thyroid condition.
Iodine does not work alone. Selenium is an essential cofactor that helps convert inactive T4 into active T3. A selenium deficiency can practically neutralize the effects of a good iodine supply.
Certain secondary plant compounds, so-called goitrogens (found in cabbage or soy), can theoretically interfere with iodine absorption. However, in an otherwise balanced diet, they play no clinically relevant role for the general population.
Some medications can influence iodine metabolism. In addition, healthy stomach acid production is fundamental for the absorption of micronutrients.
Dietary supplements are especially useful for pregnant women, nursing mothers, and people with one-sided dietary habits. However, caution is advised in cases of diagnosed autoimmune diseases such as Hashimoto's thyroiditis. Here, iodine supplementation should only be done after consultation with an endocrinologist, as too much iodine can trigger inflammatory flares.
Iodine is the motor of our metabolism and thus a key to vitality and cognitive performance. In a country like Germany, the conscious choice of iodinated foods and fish is the safest strategy to meet the daily requirement. While undersupply can have fatal consequences, especially during sensitive life phases such as pregnancy, individual assessment should always be made in cases of pre-existing conditions such as Hashimoto's. An informed approach – with a view to intake, but without unnecessary fear – is the best way to a healthy thyroid function.
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