All truths are easy to understand once they are discovered.
The point is to discover them. Hummingbirds rely on the carbohydrates in nectar to maintain a high speed metabolism. During digestion, polysaccharides must be broken down into simple sugars before absorption can take place. Indigestion occurs when when the body cannot convert a polysaccharide into monosaccharides. The undigested sugar remains in the digestive tract, feeding resident bacteria.