In modern world, with the vast changes in the way we live, we have lost touch with what has made our very own being and the traditions we've held for centuries that has made us who we are today. This is for those who lack iron in particular, as it's been said that it's best to consume our nutrition the way it was originally intended.

Cooking with cast iron has been proven to add significant amounts of iron to your diet, this is also excellent for those wanting to return to our original(pagan) way of life.

https://whatscookingamerica.net/Information/IronCastIron.htm
Foods tested (100 g./3 oz.) Iron content - raw Iron content - cooked in Cast iron
Applesauce, unsweetened .35 mg. 7.38 mg.
Spaghetti sauce 0.61 5.77
Chili with meat and beans .96 6.27
Medium white sauce .22 3.30
Scrambled egg 1.49 4.76
Spaghetti sauce with meat .71 3.58
Beef vegetable stew .66 3.4
Fried egg 1.92 3.48
Spanish rice .87 2.25
Rice, white .67 1.97
Pan broiled bacon .77 1.92
Poached egg 1.87 2.32
Fried chicken .88 1.89
Pancakes .63 1.31
Pan fried green beans .64 1.18
Pan broiled hamburger 1.49 2.29
Fried potatoes .42 .8
Fried corn tortillas .86 1.23
Pan-fried beef liver with onions 3.1 3.87
Baked cornbread .67 .86

More FAQ
https://www.thekitchn.com/5-myths-of-cast-iron-cookware-206831
https://runnersconnect.net/cast-iron-pan-iron/
https://en.wikipedia.org/wiki/Cast-iron_cookware