The Met Flex DietFrom #1 New York Times bestselling author Dr. Ian K. Smith, a powerful six week plan to burn fat more efficiently by improving metabolic flexibility. The human body has the amazing ability to switch which fuels it uses for energy based on what fuel is available at the timeresearchers call this metabolic flexibility. Bodies that are able to make this switch can burn sugars, proteins, and other food nutrients when available, and then switch to burning