Who discovered the Krebs cycle, the process by which body cells convert food into energy?

The Krebs cycle (also called citric acid cycle) was discovered by Hans Krebs in 1937. This fundamental metabolic process occurs in mitochondria and converts nutrients into energy through cellular respiration. The other options are incorrect: Freud was a psychoanalyst, Jenner developed smallpox vaccine, and Fischer was a chemist who studied sugars and proteins.