No, they cannot.
The lipids, proteins, and polysaccharides, which forms the maximum of the food one consume must be dissociated down into smaller molecules before the cells can utilize them, either as a building block for other molecules or as a source of energy.
Through the process of oxidation, energy is released in the form of ATP. The bonds among the atoms in any molecule accumulate energy and when these bonds are dissociated at the time of metabolism, the energy is taken and accumulated in a molecule known as ATP. This molecule further mediates the functions in the cell that require energy.
