❓I've heard eating vegetarian can worsen thyroid problems — is that true?

This claim partly comes from overinterpreting "goitrogens" — cruciferous vegetables (broccoli, cabbage, kale, etc.) do contain these compounds, and in theory eating large amounts raw could interfere with iodine utilization. But multiple studies show that with normal cooking (heat significantly reduces their activity) and normal serving sizes, there's essentially no real-world impact on people with healthy thyroid function. The people who really need to be cautious are those who already have abnormal thyroid function combined with iodine deficiency — for them, it's best to cook these vegetables before eating rather than blending them raw into juice and drinking a lot of it. The thyroid-related issue vegetarians actually need to pay attention to is iodine intake — if you don't eat seafood and don't use iodized salt, your iodine intake could fall short, and that's the point actually worth watching, rather than the blanket claim that "eating vegetarian harms the thyroid." If you already have a thyroid condition, it's best to discuss any dietary changes with your treating doctor based on your specific situation, rather than deciding on your own to avoid certain vegetables just based on something you read online.