[monja25]

 Many foods, from cotton candy to oranges, have the unwelcome consequence of making my hands and face sticky when I eat them. It seems to be that the mechanism of this has something to do with the sugar content, because these "sticky" foods that I could think of all have a large portion of fructose in them. I was wondering what is the cause of this, and maybe if there was a sure fire way to eat these foods without this happening?

[CliffordK]

You are right that sugar is related to stickiness.  Perhaps also starches.  I suppose there are numerous ways for your fingers to get messy.
Oils are related slipperiness. 

Eating with a fork and spoon may help prevent your hands from getting messy.

If you are making bread dough, or pie crust, sometimes sprinkling a layer of flour on the dough will help prevent it from sticking to your hands or utensils.
M&Ms "melt in your mouth" use a higher melting point covering over the chocolate.