The short version is to conclude that fructose is sweeter and cheaper than glucose and that's why we see it in all of our foods. 
We find both in nature but it seems that the ratio of one to the other is important for some people. 
If you still have questions watch the video again, I'm sure you will find more answers. 

But is honey healthier than sugar from cane, corn or beets? Watch the next video to find out.