English subtitles for clip: File:Wie Fasten den Stoffwechsel verändert (CC BY 4.0).webm
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1 00:00:03,249 --> 00:00:06,451 During fasting, our body uses its energy reserves. 2 00:00:06,500 --> 00:00:11,344 The metabolism changes within about twelve hours of the last food intake. 3 00:00:11,792 --> 00:00:15,310 The brain mainly needs sugar in the form of glucose. 4 00:00:15,500 --> 00:00:19,251 To maintain the level of glucose in the blood, 5 00:00:19,281 --> 00:00:22,293 the body first activates its reserves from the liver. 6 00:00:23,000 --> 00:00:26,535 After about 48 hours, the sugar stores are empty. 7 00:00:27,000 --> 00:00:29,920 Then the body switches to burning proteins. 8 00:00:29,950 --> 00:00:32,877 This leads to a breakdown of muscle tissue in the short term. 9 00:00:32,898 --> 00:00:35,300 The insulin level drops. 10 00:00:36,513 --> 00:00:38,930 In addition, the body begins to burn fat. 11 00:00:39,266 --> 00:00:42,283 The fat cells are converted into ketones. 12 00:00:42,709 --> 00:00:47,861 These supply energy very efficiently and inhibit further muscle breakdown. 13 00:00:48,500 --> 00:00:50,312 After a few days of fasting, 14 00:00:50,353 --> 00:00:55,999 about 90% of the total amount of energy required comes from fat burning. 15 00:00:56,803 --> 00:00:59,843 In addition, an important recycling process is underway. 16 00:01:00,190 --> 00:01:02,509 Every person has cell waste in his body. 17 00:01:02,812 --> 00:01:06,245 Fasting increases self-digestion in the body's cells. 18 00:01:06,500 --> 00:01:10,434 This so-called autophagy is a form of cell cleaning 19 00:01:10,451 --> 00:01:14,443 in which unusable and harmful cell waste is recycled. 20 00:01:14,500 --> 00:01:18,972 This gives the body important new cell building materials and energy.