Food labels list the amounts of (and calories from) carbohydrates, fats, and proteins, but not nucleic acids. why not?

Nucleic acids are not on food labels because they do not serve as a nutrient.

Explanation:

Nucleic acids are one of the most important macromolecules and are involved in making up of the DNA and RNA of organisms. The nucleic acids will be present in every living thing, whether alive or dead. Hence, nucleic acids will be present in all the food that we consume but they do not serve as a nutrient.

Hence, food labels and nutritional values on the packs do not contain the number of nucleic acids in a product.

Because food labels are required to show nutritional information and food composition. Nucleic acids are not a nutritional component of our diet, nor are they an ingredient in products.

Explanation:

List of ingredients, shelf life and nutritional information are among the mandatory items on labels, as is the home measure, which is how the consumer measures the food (slices, cups, spoons, etc.). In other words, we can say that food labels should present information relevant to people's nutrition. Nucleic acids are not a nutritional element, so they are not listed on labels.