Metabolism & insulin

[iwant2know]

As I recall back from my high school health and biology classes, the human body produces insulin in order to regulate glucose. However I read recently that insulin stops the use of fat as an energy source. I was amazed by this information. I used to consume copious amounts of sugary (high fructose corn syrup actually) drinks. Since reading this I have cut back drastically.

 

I want to know more about this. Are there any data showing how long it takes (in non-diabetic individuals) for insulin to lower back to the "fat burning level"? For example, if I consume a 12oz can of Coca Cola, how long will it take for the anti-fat burning effects to wear off?