How fasting changes the metabolism
When fasting, our body uses its reserves. Within about twelve hours after the last food intake, the metabolism changes. After a few days, around 90 percent of the total required energy comes from burning fats. Author: 3sat/nano, Spiegel TV, Liz Wieskerstrauch, O. Gurr+R. Heinze+D. Ritter+J. Staiger











