Which statement about the energy values of respiratory substrates and foods is not correct?
Lipids release more energy per unit mass than carbohydrates because they have a higher ratio of hydrogen atoms to oxygen atoms.
Carbohydrates and proteins have similar energy values of around 161616 to 17 kJ g−117\text{ kJ g}^{-1}17 kJ g−1.
Substrates with a higher proportion of oxygen in their chemical structure release more energy per gram because they are already more oxidized.
A food containing a mixture of lipids and proteins has a higher energy value than the same mass of pure starch.
