tofu

tofu + levothyroxine

Tofu is made from coagulated soy milk and is one of the most concentrated sources of soy protein in the typical diet, with roughly 20 grams of soy protein per cup. Soy protein binds levothyroxine in the gut and reduces absorption by 16 to over 35 percent depending on dose, and case reports describe TSH rising when tofu is added to a previously stable levothyroxine regimen.