Nutrient density refers to the amount of essential nutrients a food contains relative to its calorie content. Foods that are nutrient-dense provide a high level of vitamins, minerals, and other beneficial compounds without being high in calories. Examples include fruits, vegetables, whole grains, and lean proteins, which contribute to overall health and well-being. In contrast, foods that are low in nutrient density, such as sugary snacks and processed items, offer few nutrients for the calories they provide. Choosing nutrient-dense options can help individuals meet their dietary needs while managing their weight and reducing the risk of chronic diseases.