How to get / stay focused?!?

I seriously cannot focus. I am going to college online. When I sit to do some work, I get really bored trying to read the chapter, cannot focus for sh-t. Then - I end up turning the tv on to watch while I work (which obviously is dumb). Or I will be working, reading information on the internet then click to Facebook, and start surfing - or I'll even look up some dumb sh-t. There are just times I cannot focus.... any foods i can eat or avoid to help me focus? besides coffee and sugary foods (i know to avoid them).