Effect of broccoli sprouts on thyroid function, haematological, biochemical, and immunological parameters in rats with thyroid imbalance.
Level 5 - mechanism / opinion, no new human data
Animal research without human data (CEBM level 5)
PubMed 29080462 · doi:10.1016/j.biopha.2017.10.098
What was done
Researchers evaluated the effects of long-term dietary broccoli sprout supplementation in rats with experimental hypothyroidism induced either by iodine deficiency or sulfadimethoxine ingestion. Outcomes evaluated included serum TSH, fT3, and fT4, antioxidant enzymes (cytosolic GPX1, thyroid thioredoxin reductase, plasma GPX3), immunological markers (IL-6, IL-10), haematological parameters, biochemical indices of liver and kidney function, and thermographic measurements.
What was found
The abstract reports no numerical values. Levels of TSH, fT3, and fT4 remained unchanged following broccoli sprout ingestion, and sprout intake showed a protective effect against sulfadimethoxine-induced thyroid damage. Thioredoxin reductase activity in the thyroid significantly increased, and IL-6 decreased relative to iodine-deficient controls, with no significant difference in IL-10. Red blood cell indices, glucose, uric acid, and kidney function markers were unchanged, whereas white blood cell and platelet counts were reduced, alongside potential adverse effects on liver function.
Why it matters
This study provides animal-model evidence that glucosinolate-rich broccoli sprouts do not worsen thyroid hormone deficiency under hypothyroid conditions, though potential haematologic and hepatic consequences require caution.
Limits
The study is restricted to an animal model and cannot establish human clinical outcomes. The abstract omits sample sizes, specific sprout dosages, duration of exposure, and all numerical effect sizes and confidence intervals.
Cited by
- supports A 2018 animal study found broccoli sprout extract caused no harmful effect on thyroid homeostasis (TSH, T3, T4) in iodine-deficient rats and had an antioxidant beneficial effect in hypothyroid rats.