Phytates and phytic acid. Here's what you need to know ...
Yet, they also consume more antinutrients, including phytates, and these reduce the amount of iron available to their bodies. Consuming 510 mg of phytic acid can reduce iron absorption by 50%. This is why vegetarian eaters should eat more iron than omnivores (33 mg for veg eaters vs. 18 mg for omnivores).