The output of carbon during fasting may be illustrated by the following experiment[24] made upon a young man, the nitrogen data being included for comparison, and likewise the intake of food, in terms of nitrogen and carbon, preceding the fast and for two days following the fast. The fasting was of five days’ duration. [24] Taken from Johansson, Landergren, Sondén, and Tiegerstedt: Beiträge zur Kenntniss des Stoffwechsels beim hungernden Menschen. Skandinavisches Archiv für Physiologie, Band 7, p. 29. +------+--------------+---------------------+------------------------+ | | | Intake. | Output. | | Day. | Body-weight. +---------+-----------+------------+-----------+ | | | Carbon. | Nitrogen. | Carbon.[25]| Nitrogen. | +------+--------------+---------+-----------+------------+-----------+ | | kilos | grams | grams | grams | grams | | 2 | 67.4 | 438.7 | 30.96 | 303.4 | 25.81 | | 3 | 66.9 | 0 | 0 | 197.6 | 12.17 | | 4 | 65.7 | 0 | 0 | 188.8 | 12.85 | | 5 | 64.8 | 0 | 0 | 183.2 | 13.61 | | 6 | 63.9 | 0 | 0 | 180.8 | 13.69 | | 7 | 63.1 | 0 | 0 | 176.2 | 11.47 | | 8 | 63.9 | 439.9 | 35.65 | 270.5 | 26.83 | | 9 | 65.5 | 391.7 | 23.68 | 258.8 | 19.46 | +------+--------------+---------+-----------+------------+-----------+ [25] The carbon output represents the total carbon of the expired air, urine, and excrement.