Iron that comes from animal products is not good for humans because it gets stored by the body as ''iron reserves," but the human body cannot use that kind of iron properly, and it has been linked to diabetes, heart disease and other health problems (especially heme iron that's found in red meat).
Spirulina is often deemed the most nutritionally complete of all food supplements, containing a rich supply of nutrients including protein, iron, complex carbs & vitamins A, K, & B complex & is the highest source of B12, essential for nerves & tissue. Reduces allergic reactions from radiation sickness & is rich in GLA, (found in breast milk). It increases stamina & immunity levels in athletes, & its high protein helps build muscle mass. It is the richest beta carotene food.
Iron Rich Fruits. Though not loaded with iron itself, fruit makes an important contribution to iron absorption for people relying on plant-based sources of food for iron (such as those on a vegetarian diet): fruit tends to be high in vitamin C, an iron absorption enhancer.
http://theskinnyconfidential.com/wp-content/uploads/2012/08/How-to-measure-portion-control.jpg?9d7bd4 (Not sure I completely agree with the exact calorie count for this, but I suppose it's a decently rough guideline.)