Here's why:

* Carbohydrates are made up of carbon, hydrogen, and oxygen. The bonds between these atoms, particularly the C-H bonds, store a significant amount of chemical energy. When these bonds are broken, energy is released, which is why carbohydrates are a primary source of fuel for living organisms.

* Lipids (fats) also contain high energy bonds, but these bonds are mainly found in the C-C and C-H bonds of the long hydrocarbon chains. While lipids store more energy per gram than carbohydrates, carbohydrates are more readily accessible for energy production.

* Proteins and nucleic acids also contain energy bonds, but these bonds are primarily involved in structural and functional roles rather than energy storage.

In summary, while other organic compounds contain energy bonds, carbohydrates are specifically known for their high-energy bonds that are readily available for energy production.