Iodine deficiency disorder control program
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Iodine Deficiency Disorder (IDD) Control Program
What is IDD?
Iodine is an essential micronutrient required for synthesis of thyroid hormones - thyroxine (T4) and triiodothyronine (T3), which contain 4 and 3 atoms of iodine respectively. The adult human body contains about 50 mg of iodine, with a blood level of 8-12 micrograms/dL.
The most obvious consequence of iodine deficiency is goitre, but the problem is far wider. WHO replaced the term "endemic goitre" with Iodine Deficiency Disorders (IDD) to capture the full spectrum of effects on human growth and development. - Park's Textbook of Preventive and Social Medicine
Spectrum of IDD
| Stage | Disorders |
|---|---|
| Foetus | Spontaneous abortions, stillbirths, congenital anomalies, increased perinatal mortality, neurological cretinism (deaf-mutism, spastic diplegia, squint), myxoedematous cretinism (dwarfism, mental deficiency), psychomotor defects |
| Neonate | Neonatal goitre, neonatal hypothyroidism |
| Child & Adolescent | Goitre, juvenile hypothyroidism, retarded physical development |
| Adult | Goitre with complications, hypothyroidism, impaired mental function, subnormal intelligence |
The spectrum, in increasing order of severity, includes: goitre (Grade I, II, III, multinodular), hypothyroidism, subnormal intelligence, delayed motor milestones, mental deficiency, hearing/speech defects, strabismus, nystagmus, spasticity, neuromuscular weakness, endemic cretinism, and intrauterine death. - Park's Textbook, Table 13
Iodine Requirements
| Group | Requirement |
|---|---|
| Adults | 150 micrograms/day |
| Pregnant women | 250 micrograms/day (WHO) |
| Children (varies by age) | 90-120 micrograms/day |
Goitrogens
"Goitrogens" are chemical substances that interfere with iodine utilization by the thyroid gland. They may occur in food and water. The brassica group of vegetables (cabbage, cauliflower) may contain goitrogens. The most important dietary goitrogens are cyanoglycosides and thiocyanates. - Park's Textbook
Epidemiological Assessment Indicators
Before initiating an iodization programme and for surveillance, the following indicators are used:
- Prevalence of goitre
- Prevalence of cretinism
- Urinary iodine excretion (UIE) - most recommended for surveillance
- Serum T4 and TSH levels
- Prevalence of neonatal hypothyroidism
Neonatal hypothyroidism is a sensitive indicator of environmental iodine deficiency. Serum T4 is more sensitive than T3 for thyroid insufficiency.
Magnitude of Problem in India
- Out of 324 districts surveyed in 29 states and all Union Territories, 263 districts are endemic (prevalence >10%)
- Over 71 million people suffer from goitre and other IDD
- Not restricted to the traditional "goitre belt" (sub-Himalayan regions) - widespread across India
- More than 200 million people estimated to be at risk
- ICMR surveys show no state/UT is entirely free from IDD
National IDD Control Program - Historical Timeline
| Year | Milestone |
|---|---|
| 1962 | National Goitre Control Programme (NGCP) launched - India was the first South Asian country with a scaled-up salt iodization program |
| 1983 | Elimination of IDD included in the 20-Point Programme of the Prime Minister |
| 1986 | Universal Salt Iodization (USI) implementation began in phased manner |
| 1992 | Programme renamed to National Iodine Deficiency Disorders Control Programme (NIDDCP) |
| 1993 | IDD control included in the National Nutrition Policy |
| 1995-2000 | National Plan of Action on Nutrition - goal to reduce goitre prevalence to <10% through universal salt iodization |
| 2008-2012 | Control of IDD emphasized in the 11th Five-Year Plan |
| 2019 | Revised Food Safety and Standards (Fortification of Foods) Regulations - iodine level in salt set at 15-30 ppm at production and consumer level |
Objectives of NIDDCP
- Conduct surveys to assess the magnitude of IDD
- Supply iodized salt in place of common salt throughout the country
- Re-survey every 5 years to assess the extent of IDD and impact of iodized salt
- Laboratory monitoring of iodized salt and urinary iodine excretion
- Health education and advocacy
Key Intervention: Universal Salt Iodization (USI)
USI is the cornerstone of the IDD Control Program.
- Salt iodization is safe, accessible, available, affordable, and cost-effective
- USI involves iodization of all human and livestock salt, including salt used in the food industry
- WHO/UNICEF/ICCIDD approved cut-off: 20-40 ppm iodine in salt
- India's current standard: 15-30 ppm at production and consumer level
- Sale of non-iodized salt is prohibited by government notifications
Why salt? Salt is consumed universally, daily, in relatively constant amounts across all socioeconomic classes, making it the ideal vehicle for iodine delivery on a continuous, self-sustaining basis.
Role at PHC Level (NIDDCP)
At Primary Health Care level, the NIDDCP activities are:
Essential:
- IEC (Information, Education, Communication) activities to promote consumption of iodated salt
- Monitoring of iodated salt through salt testing kits
Supporting activities:
- State-level coalitions and strengthening of State IDD Cells
- Community monitoring
- State-level iodine surveys
- Engagement with the Public Distribution System (PDS) to reach last-mile populations
Monitoring Indicators
| Indicator | Target |
|---|---|
| Household use of adequately iodized salt | >90% |
| Median urinary iodine concentration (school-age children) | 100-299 mcg/L |
| Goitre prevalence | <10% |
| Salt iodine content at consumer level | 15 ppm minimum |
Challenges & Current Status
- India is on the path to achieving >90% household coverage of adequately iodized salt
- Each state has unique challenges with the USI program
- Political commitment and legislation are essential to sustain the program
- The Indian Thyroid Society consensus (2024) emphasizes the need to harmonize salt iodization with salt reduction strategies for NCD control
- "Last mile" populations - particularly those depending on the Public Distribution System - remain a challenge
Summary
The NIDDCP represents one of public health's most successful and cost-effective nutritional intervention programs. The program's primary strategy - universal salt iodization - has dramatically reduced the burden of IDD in India over six decades, transforming what was once considered a "goitre belt" problem into a nationwide program addressing the full spectrum of iodine deficiency disorders, from cretinism to impaired cognition.
- Park's Textbook of Preventive and Social Medicine
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