Hey JKurz, fuck you.
http://www.healthandage.com/Home/gid2=2809
"Footnotes
1. There are two types of iron found in foods: heme and non-heme. The body absorbs heme iron more easily than non-heme iron. Heme iron is found in animal products (meat and fish), and non-heme iron in plants (e.g. vegetables, fruit, grains), and in supplements."
Bottom of page is that.
Then, under the second paragraph of the "What The Results Showed" section, we have...
"The diets were evaluated for total iron intake, total heme iron1, heme iron derived from red meat, and heme iron from non-red meat sources. The subjects were divided into 5 equal-sized groups depending on their intake of total iron (these are called quintiles). Quintiles were also formed for heme iron and non-heme iron intake."
Oh, and I pay plenty attention in my science classes, and this isn't something they really teach us about. Why don't you stop being stubborn, drop the ego and try doing one of the newer-age programs that doesn't entail hitting a bodypart once a week and "destroying" it with 9+ sets.
Smile!