Final answer:
Dinitrophenol (DNP) prevents the production of ATP and converts energy into heat, leading to weight loss.
Step-by-step explanation:
Dinitrophenol (DNP) is an uncoupler that makes the inner mitochondrial membrane leaky to protons. It disrupts the normal flow of electrons during electron transfer in the electron transport chain in cellular respiration. By interfering with this process, DNP prevents the production of ATP and causes the energy released from food to be converted into heat instead, resulting in weight loss.