Original
Do not take any kind of iron pills or multivitamins which often could have more iron than what is stated. Do not take vitamin C pills (pure ascorbic acid). Avoid to drink citrus juices 1 hour before and 1 hour after a meal. Do not eat a lot of beans and lentils. Do not eat liver and blood products. Drink rather coffee or tea to the meals. Avoid drinking alcohol or limit the intake to much less than what is the health recommendation for your country.
Do not process you food in cast iron. Especially not if you also add citrus juice when cooking.
Otherwise eat a varied and healthy diet. That include to make your food from scratch. Avoid too much processed food, and stay away from junk food (including hamburgers,and everything out there being deep fried). Avoid too much intake of sugar products.
Stay away from raw oysters, clams and shellfish especially in the tempered waters due to Vibrio vulnificus bacteria. Stay away from under cooked/fried pork meat due the Yersinia entereocolitica bacteria.