Our bodies are made of cells, cells are made of molecules and molecules are made up of atoms.  On a quantum level an atom is essentially a tiny packet of energy.  Therefore, our bodies are essentially dense constructs of energy.  All aspects of our being is energy, our thoughts, beliefs and words all have energy to them.  Based on what has been discovered through the study of epigenetics, the environment that a cell is in dictates how the persons DNA is expressed.