Iodine Deficiency and Mortality in Spanish Adults: Di@bet.es Study

Area of Science:

• Nutrition Science
• Epidemiology
• Public Health

Background:

• Iodine deficiency (ID) poses a significant public health concern.
• Longitudinal data on the impact of ID on mortality are limited.
• Understanding iodine status is crucial for population health strategies.

Purpose of the Study:

• To investigate the association between iodine nutrition status and all-cause and cause-specific mortality.
• To assess mortality risk across different urinary iodine (UI) concentration levels in a Spanish adult population.
• To identify potential links between iodine levels and health outcomes.

Main Methods:

• Longitudinal observational study involving 4370 Spanish adults (Di@bet.es study, 2008-2010).
• Mortality risk assessed using Cox regression based on baseline urinary iodine (UI) concentrations.
• Adjustments made for multiple confounding variables including age, sex, lifestyle, and pre-existing conditions.

Main Results:

• A total of 254 deaths (cardiovascular, cancer, other) were recorded over a 7.3-year follow-up.
• Individuals with moderate-severe iodine deficiency (UI < 100 μg/L) showed a significantly increased risk of all-cause mortality (HR 1.29-1.71).
• This association persisted after multivariate adjustment for potential confounders.

Conclusions:

• Moderate to severe iodine deficiency is associated with excess mortality in the Spanish adult population.
• Urinary iodine concentration is a valuable indicator for assessing population iodine status and mortality risk.
• Findings highlight the importance of adequate iodine intake for long-term health and survival.