Research
Micronutrients & recovery
Regional variations in iodine status exist in Canada, with residents of Quebec City and Vancouver having significantly lower iodine status compared to those in Hamilton and Ottawa, driven by differences in dietary habits and environmental exposure to inhibitors.
Where you live affects your iodine status. People in Quebec City and Vancouver were found to have lower iodine levels than those in Hamilton and Ottawa. This is likely due to local dietary differences (less dairy/bread) and higher exposure to inhibitors like smoking. Check your local food sources.
GoodSupportsHIGH confidence
Participants residing in Quebec City (OR = 2.58; p = 1.74 × 10−4) and Vancouver (OR = 2.54; p = 3.57 × 10−4) were more susceptible to iodine deficiency than Hamilton or Ottawa.
Why this rating
Large sample size, robust measurement, statistically significant regional differences.
Source
The Prevalence and Risk Factors Associated with Iodine Deficiency in Canadian Adults
Stellena Mathiaparanam et al. · Nutrients · 2022
DOI 10.3390/nu14132570
cross_sectional · n=800Cited 14×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Dietary iodine intake is primarily derived from dairy products in Canadian adults, and public health policies promoting salt restriction and reduced dairy consumption may inadvertently increase the risk of iodine deficiency.Good
- Smoking and consumption of goitrogenic foods (specifically cruciferous vegetables and processed meats) increase urinary levels of thiocyanate and nitrate, which act as competitive inhibitors of iodine uptake, thereby increasing the risk of iodine deficiency.Good
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