The study authors were particularly concerned with iron concentration in insects, since iron is an important nutrient that's often lacking in vegetarian diets. (health.com)
This might be due to it's high iron concentration or simply due to its «comfort food» feel. (thenextfamily.com)
Episodic increases in iron concentrations of this magnitude or larger were probably frequent in the past because a large component of the undercurrent originates in the convergent island - arc region of Papua New Guinea, which has experienced intensive volcanic, erosional and seismic activity over the past 16 million years. (gfdl.noaa.gov)