- A cohort study suggests that stable consumption of swordfish is associated with higher rates of postpartum thyroiditis compared with consumption of oily fish.
Why this matters
- Findings suggest that consumption of swordfish, which is enriched in pollutants, can lead to higher rates of postpartum thyroid problems.
- Women who selectively/predominantly consumed swordfish had higher positivity rates for serum thyroid autoantibodies (21.7% vs 4.7% [P<.0001 for tpoab vs tgab and higher rates of postpartum thyroiditis compared with women who selectively consumed oily fish.>
- Women who ate swordfish not predominantly plus other fish, not necessarily oily fish, had 15.7% prevalence of postpartum thyroiditis, whereas women who ate fish other than swordfish and oily fish had 13.7% prevalence of postpartum thyroiditis (P<.05 for both vs women who ate oily fish selectively>
- The highest prevalence of postpartum thyroiditis (40%) was found in women who did not eat fish.
- Approximately 55% of women with postpartum thyroiditis developed permanent hypothyroidism.
- 236 pregnant women were analyzed for associations between fish consumption and development of postpartum thyroid problems.
- Funding: Regional Department of Health.
- Conclusions may be specific to this geographic region (Messina, Italy).
- No multivariate analysis.