Can someone give me some advice on how to help a food aggressive dog?

My dog is a little food aggressive,its not to bad,occasionally if you put your hand down by her food bowl while she's eating she will growl,and sometimes if you pet her while she's eating she will do the same thing,however I really want to get her to stop this and I was wondering if anyone could share there advice,experience,etc.etc.I found a video on youtube that I thought was amazing but they really didn't show how they broke the dog of this behaviour.Heres the video http://youtube.com/watch?v=iUGAcennOOs

If anyone could tell me how they trained this dog not to be food aggressive that would be great also,thanks in advance to everyone that answers.
 
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