Soybean products, including soy oil, block iodine uptake. Your thyroid gland cannot function properly without iodine. Symptoms of low thyroid function include fatigue, dry skin and hair, cold hands and feet. Other iodine blockers include fluoride and chlorine. Other foods that block iodine uptake include raw kale, turnips, broccoli, cauliflower and cabbage, but once you cook them they’re fine. For more details, please read Chapters 4 (about thyroid) and Chapter 16 (about soy) in What Your Doctor May Not Tell You About Breast Cancer.

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