Metabolic flexibility (MetF) enables us to quickly switch back and forth between bodily processes depending on the availability of nutrients. This ability allows us to store energy when food availability is high, and use that energy when food availability is low. Insulin is important in this process: its supply increases when carbohydrates are ingested, at which time it stimulates metabolic processes. Our daily cycle of fasting and eating is an example of metabolic flexibility, (ie, we fast while sleeping every night).
