What are concentrated sweets?

First a sacchride (sugar molecule) is THE absolute most readily available/usable form of energy. The body does no work to use it, just puts it to use immediately.

Concentrated sweets, scientifically (unscientifically) are monosacchrides (1 sugar molecule). There are also disacchrides (2 sugar molecules), and polysacchrides (many sugar molecules).

To picture this thing of a snow flake. One snow flake would melt instantly. Two snowflakes would take slightly longer to melt. Many, many snowflakes packed together would take longer to melt. The same is true for the sugars above. Concentrated sweets pack together monosacchrides, and when eaten, the body does no work, and has to wait no length of time for them to be used as energy. Similar to the solo snowflake that melts.