Hidden hunger, also known as micronutrient deficiency, is a form of undernutrition that occurs when individuals do not consume enough essential vitamins and minerals in their diet. This type of malnutrition can lead to serious health problems, even if individuals are consuming enough calories. Hidden hunger is often not easily visible and can go unnoticed, hence the term "hidden." It can affect people of all ages, but is particularly harmful for children and pregnant women, as it can lead to stunted growth, impaired cognitive development, and increased risk of disease.