The stomach is a muscular sac that is important for absorbing food and preparing food for further digestion.
Fortified foods are those in which the amount of nutrients post processing is higher than what it was before the food item was processed or refined. Examples of fortified foods include milk which is fortified with vitamin D and salt which is fortified with iodine. Fortification of food is a part of the nitrification process of food that also includes enrichment. Enriched foods are those that contain added nutrients to replace those lost during the refining/processing stages.