The nutrition label on rice lists the amounts of proteins, carbohydrates, and fats in one serving. these substances are important for human nutrition.

how are proteins, carbohydrates, and fats related to the discipline of chemistry?

Carbohydrates, proteins and fats are biological macro molecules that are made up of chemical elements which are inherent to chemistry.
Chemistry explain how these macro molecules are bonded together at the molecular level and give explanation for their behavior.

Butterfly wingspan is 7.7