Why can the reduction iron powder can be used as a food antioxidant?

Why can the reduction iron powder be used as a food antioxidant?

   Reduced iron powder for food additives in addition to prevent the deterioration of food due to oxidation or a nutritional fortifier, it is because the iron and air in the water and oxygen reaction and anti-food deterioration, and iron and stomach in the stomach pain ( HCl) produces ferrous ions in the iron and prevents iron deficiency from anemia.

   Iron powder and air and air molecules in the water will be a chemical reaction to absorb water molecules, lime will react with water can also absorb water. So it can be used as a desiccant.