Here's why:

* Nucleic acids are essential building blocks of life. They carry genetic information (DNA) and are involved in protein synthesis (RNA).

* All living organisms contain nucleic acids. This includes plants, animals, and even microorganisms like bacteria and fungi.

* We consume nucleic acids when we eat. This means many foods, especially those derived from living organisms, contain them.

Examples of foods rich in nucleic acids:

* Meat: Beef, chicken, pork, fish

* Dairy: Milk, cheese, yogurt

* Eggs: Whole eggs

* Legumes: Beans, lentils, peas

* Nuts and seeds: Almonds, cashews, sunflower seeds

* Vegetables: Broccoli, spinach, mushrooms

* Grains: Rice, wheat, oats

Important note: While we consume nucleic acids in our diet, our bodies break them down into their component parts (nucleotides) during digestion. These nucleotides can then be used for our own DNA, RNA, and other essential functions.

In summary, many food substances contain nucleic acids, which are vital for life. While we don't directly absorb nucleic acids from our food, they provide important building blocks for our own biological processes.