Recently I read that Spinach is considered to be in the family of goitrogenic foods and I've been wondering about about thyroid issues. I like to use tons of spinach in my green smoothies - should I discontinue? Also, I read that raw spinach inhibits calcium absorption.... ugh, I really hate to cut out another food! Any thoughts on this?
It is always a good idea to rotate the greens you use in green smoothies--you would surely be fine if you cut back the spinach to maybe two days a week. All plants have potential negative substances in them, so it's best not to eat too much of anything, in my opinion.
I've used fresh parsley, cilantro, dill, arugula, watercress, carrot tops, dandelion, purslaine (good foraged), oregano leaves and sunflower sprouts with good results. Whatever you can get for variety should be good.