What is the daily requirement of iodine for normal human development?

Raj. CHO -2020

Applied Nutrition & Dietetics

Easy

Appeared in: Raj. CHO -2020

Explanation

The recommended daily allowance (RDA) for iodine in adolescents and adults is 150 micrograms (µg), which falls within the 100-150 µg range.
Iodine is an essential micronutrient required for the synthesis of thyroid hormones (T3 and T4), which are critical for regulating metabolism, growth, and brain development.
This specific range ensures adequate thyroid function without the risk of toxicity associated with higher doses.

Option A: This range (50-100 µg) is below the recommended daily intake for adults and adolescents (150 µg). While it may be sufficient for young children (90 µg for ages up to 5 years), it is inadequate for normal adult development and function.
Option B: The unit 'milligrams' (mg) is incorrect. 50-100 mg is 1000 times the required dose (50,000-100,000 µg). Such high levels are toxic and can disrupt normal thyroid function, potentially inducing hypothyroidism (Wolff-Chaikoff effect) or hyperthyroidism.
Option D: The unit 'milligrams' (mg) is incorrect. 100-150 mg is a pharmacological dose, not a nutritional one. It is 1000 times higher than the daily requirement and is toxic, posing significant health risks to the thyroid gland and overall health.

Visual 1: Infographic - The Spectrum of Iodine Deficiency Disorders (IDD). This would show the effects of iodine deficiency across the lifespan, from fetus (stillbirth, cretinism) to adult (goiter, hypothyroidism), reinforcing the importance of adequate intake.
Visual 2: Diagram - Foods Rich in Iodine. This visual would display common sources like iodized salt, seafood, dairy products, and eggs, providing practical dietary information for patients.
Visual 3: Anatomical Illustration - Goiter. A simple before-and-after illustration showing a normal thyroid gland versus an enlarged thyroid gland (goiter) would visually explain a key sign of iodine deficiency.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Nutritional requirements, specifically the daily recommended intake of iodine as background academic context rather than a clinical decision trigger.
Nurses play a vital role in community health by educating families on the importance of using iodized salt to prevent Iodine Deficiency Disorders (IDDs). This is a key public health intervention in India under the National Iodine Deficiency Disorders Control Program.
During antenatal check-ups, it is crucial to assess the nutritional status of pregnant women and counsel them on their increased iodine requirement (220-250 µg/day) to prevent fetal complications like cretinism and impaired brain development.
What if? If a patient from a coastal area who consumes a lot of seaweed presents with symptoms of hyperthyroidism, the nurse should consider the possibility of iodine-induced hyperthyroidism, as seaweed is extremely rich in iodine. The assessment would need to include a detailed dietary history.

How to Approach the Question

First, identify the key components of the question: the nutrient ('iodine') and the parameter ('daily requirement').
Pay close attention to the units provided in the options. The question presents both 'micrograms' (µg) and 'milligrams' (mg). Recognize that this is a common trap to test your knowledge of dosage.
Recall that 1 milligram = 1000 micrograms. Nutritional requirements for trace minerals are typically in the microgram range, while pharmacological doses might be in milligrams. This allows you to quickly eliminate the milligram options as dangerously high.
Between the two microgram options, recall the standard adult RDA. The established requirement for an adult is 150 µg/day.
Select the option that includes this value. The range 100-150 µg is the most accurate choice.

Concept Tested & Keywords

Concept Tested: Nutritional requirements, specifically the daily recommended intake of iodine.
Stem keywords: daily requirement, iodine, normal human development
Lead-in keywords: What is

QnTf7dLddkBYJjNlMYQVS_