Illustration of drinks absorption. Explanation: horizontal axis: elapsed time, vertical axis: %. Based on this the 60% of the 20 % glucose solution, which is the most disadvantageous, will still be in your stomach after 60 minutes meaning that huge part of it will still not be absorbed even one hour after consumption. That's when you can observe that certain clucking feeling. Here's a riddle: Which or what weight percentage is the most efficiently absorbable solution?
blue: water
green: 5 % glucose solution
yellow: 10% glucose solution
red: 20 % glucose solution
*Answer for the question: the 5% glucose solution