1. Farmers and manufacturers work to develop foods with better nutritional content. Discuss the term fortification with your students. Explain that vitamins and minerals can be added to a food to make it more healthful and to help people meet their recommended daily intake of different nutrients.
2. Ask students: What are some examples of fortification? Adding fiber to foods to promote digestive health, adding calcium and vitamin D to promote bone health, adding omega-3 fatty acids to support heart health, etc. What is the purpose of fortification? To provide more nutrients in the foods people eat.
3. One food that is fortified and sold in grocery stores year-round is orange juice. Show the class an orange juice container. Point out where it says “with calcium” or “with vitamin D.” Cover the labels and give students samples of the two juices to taste, each in a different color of cup. Don’t tell students which is which.
4. Ask students: Does fortified juice taste different than regular juice? When nutrients or vitamins are added to foods, this may change the flavor and appearance. Since taste is a major factor in what people will or won’t eat or drink, companies work to find the right balance between fortification and taste. They might conduct taste tests like this one to see if most people can tell the difference.
5. Explain that another common fortified food is breakfast cereal. Show the class several empty cereal boxes.
6. Ask students: What information is on the box to let the customer know that the cereal may have been fortified? Students will see words and phrases such as “plus omega-3s, good source of calcium and vitamin D, high in fiber, iron rich,” etc.
7. Next show students the box of whole grain wheat cereal fortified with iron and point out on the label where it says the cereal contains iron.
8. Ask students: Why do our bodies need iron? Iron is a mineral. Our hemoglobin contains iron. Hemoglobin carries oxygen from our lungs throughout our bodies. Having too little hemoglobin is called anemia. Iron also helps our muscles store oxygen and helps our bodies digest food.
9. Show the students a plastic bag containing about one cup of whole grain wheat cereal fortified with iron. Ask a student volunteer to crush the cereal in the bag using their hands.
10. Ask students: Can you see the iron that was added? No. If we can’t see the iron, how can we prove that it has been added to the cereal? Encourage students to think about the traits of other metals, which are attracted to magnets. Lead students to see that a magnet can help detect iron in the cereal.
11. Fill the bag about half full of warm water and seal it carefully. Be sure to leave an air pocket inside the bag. Shake the bag gently to mix the cereal and water.
12. After 30–60 minutes, invite students to watch as you place a strong magnet on the outside of the plastic bag.
13. Ask students: What did you observe? Tiny black specks were attracted to where the magnet was. This is the iron in the fortified cereal.
14. Allow small groups of students to use the bag and magnet to see the result up close.

Teaching Note: Test your whole grain wheat flake cereal in advance. Not all brands work equally well. Also be sure to use a strong magnet for maximum results.