Nutrient-dense foods are foods that are very healthy and you can typically eat more of these foods than calorie-dense foods. cal
ories give energy, whereas nutrients give you other things your body needs to survive such as protein, iron, etc. some calorie-dense foods are extremely healthy, and some calorie-dense foods, like meat, is very unhealthy.
Meat provides iron and important amino acids. Labeling food as "healthy" or "unhealthy" leads to eating disorders. Everything in moderation therefore your body can obtain all the nutrients necessary for its survival.