Fortification involves adding nutrients to foods to correct or reduce deficiency disorders. It is done through three main types: biofortification which increases crop nutrient levels through breeding; home fortification by adding micronutrient powders to foods; and industrial fortification by adding nutrients to widely consumed foods like wheat, rice and oil during processing. Food fortification is an effective public health strategy to reduce nutritional deficiencies across large populations in a cost-effective manner without changing diets.