It’s advisable to steam vegetables from the brassica family lightly as this renders the goitrogens present in these vegetables inactive. Goitrogens are responsible for depressing thyroid function in some people, so if your thyroid is underactive you don’t want to eat a lot of raw broccoli, cauliflower and cabbage. Steaming allows you to not only get the best out of them, but to avoid the potential hypothyroid effect.