"Fortified" refers to the process of enhancing a food or drink by adding essential nutrients that may not be present in sufficient amounts. This is commonly done to improve health benefits and prevent deficiencies. For example, many breakfast cereals are fortified with vitamins like vitamin D and minerals such as iron to support overall nutrition. In a broader context, "fortified" can also describe structures or locations that have been strengthened for defense. This includes buildings or military installations that are reinforced with walls, barriers, or other protective measures. Historical examples include fortified castles and military forts designed to withstand attacks.