Excess dietary iodine, goitrogens, birth control pills, green tea, cyanogenic plant foods, selenium deficiency, B12 deficiency, isoflavones, PCBs, BPA, triclosan, perchlorates, organic chlorine compounds in pesticides, cosmetics, and heavy metals can negatively affect thyroid function.

“Fast food, junk food, ultra-processed foods, heated seed oils, refined carbs and additive sugar, high-fructose corn syrup, food additives, preservatives, artificial colors, pesticide residues, herbicide residues (glyphosate), hormone-disrupting chemicals in foods (including leachables from packaging, preservatives, and exogenous hormones in meat), heavy metals in fish, moldy foods, mycotoxins, alcohol, energy drinks, sugary beverages, excessive caffeine”