Final answer:
Among the options given, fish is the example of a nutrient-dense food because it is rich in essential nutrients like protein, vitamins, minerals, and omega-3 fatty acids, all while being lower in calories compared to the other options (option 4).
Step-by-step explanation:
The question asks which of the provided options is an example of a nutrient-dense food. A nutrient-dense food is defined as one that contains many essential nutrients per calorie. These foods are considered to be very beneficial as part of a healthy diet because they deliver a high amount of nutrients compared to their calorie content. Of the options given, (1) Hot dog, 2) Cookies, 3) Diet soda, 4) Fish), fish is the nutrient-dense food.
Fish is rich in important nutrients like protein, vitamins, and minerals, especially omega-3 fatty acids which are beneficial for heart health. Unlike hot dogs, cookies, or diet soda, fish provides a significant source of nutrients while also being lower in calories, making it a much healthier choice. Therefore, when selecting nutrient-dense foods, lean meats such as fish are a recommended source of essential nutrients that help maintain overall health.
Hence, the answer is option 4.