After a 10-day water fast, the average body weight significantly decreased by over 7kg, a reduction of almost 10%. The first three days saw the largest drop – an average of 1.2kg per day – after which body weight loss progressively slowed to 0.28kg on the 10th day.  Predictably, body weight started to increase during the refeeding period, but once refeeding was complete, the average body weight was still 3.5kg below the starting level. Not bad for just ten days.