During WWII, Russian soldiers took “heat pills” that kept them warm in the winter; however, they would also lose weight despite eating well. 2,4-dinitrophenol spikes metabolic rate as potential energy is lost as heat—it is banned as a weight loss aid (U.S.) as overdose can cook people to death.
For a period of thirty years a man weighed everything he ate and drank, as well as all of his waste, in order to study metabolism.
Frequent eating does not increase your metabolism.
Fructose can speed alcohol metabolism by 80%.
A Japanese man accidentally hibernated for 24 days in the cold without food or water.