Salt Iodization Cut Goiter in Indian Children but Raises Thyroid Autoimmunity Concerns
A major study found that India's Universal Salt Iodisation program successfully reduced goiter in schoolchildren over four decades, but thyroid autoimmunity has become more common as an unexpected side effect.
Success and New Challenge
A nationwide study has found that goitre among Indian schoolchildren has fallen sharply over the past four decades, while thyroid autoimmunity has become more common. Published in The Lancet Regional Health – Southeast Asia, the study screened 8,903 children aged 10 to 18 years across eight regions between January 2024 and December 2025.
Impact of Salt Iodization Program
The findings highlight the impact of India's Universal Salt Iodisation programme and the need for continued monitoring. India's decades-long effort to iodize salt has been remarkably successful in eliminating the thyroid enlargement condition known as goiter, which once affected millions of schoolchildren across the country.
Emerging Thyroid Autoimmunity
While goiter has declined dramatically, researchers discovered that thyroid autoimmunity—conditions where the immune system attacks the thyroid gland—has increased in prevalence among the same population. This unexpected finding suggests that while iodine supplementation through salt has solved one major public health problem, it may be creating new challenges for thyroid health. The mechanism behind this increase remains under investigation.
Monitoring and Next Steps
The findings highlight the impact of India's Universal Salt Iodisation programme and the need for continued monitoring. The study emphasizes the importance of ongoing surveillance to understand the relationship between iodine supplementation and thyroid autoimmunity. Public health officials will need to develop strategies that maintain the benefits of iodine supplementation while addressing the emerging autoimmunity concerns.