Hello Ms. Marla, there're a few rules for your reference.
1. Iron is carried in protein, foods with no protein contains no iron. This means foods of fat, including oils, mayonnaise, butter.
2. Sugar and artificial sweetener don't contain iron.
3. Meat, diary, vegetables, fruit, seafood all contain iron, however it's impossible to avoid all of them. You can only choose the low iron foods. A simple way is to check on the color. Foods rich in iron is red or black, say pork, beef, red bean, sesame, foods lower in iron are white, like milk, cheese, egg white, cabbage, cauliflower, garlic, white mushroom, kohlrabi.
4. Some foods reduce the absorption of iron, what helps you is tea(green, black), and foods high in calcium.