I have the coil so I don't get periods eat healthy diet of fish fruit and meats but my iron levels are still really low, why?

Iron loss? If your iron levels are "really low, " you need to have this investigated. You could be losing "occult" blood, and this could make you anemic. In some cases also, people are not absorbing iron well from their diets. Hoping you work with your physician about this. Be well.