Food Aggression should not be tolerated, lol it is a sign of obsessive compulsive behaviour meaning your dog is in an unbalanced state of mind.
Do not allow your dog to growl at you , or to interact with you in an aggressive manner.
Have you tried eating first , before feeding your dog , eat out of his bowl , place a bit of dried cracker onto top on a plate and let your dog watch you eat.

Place bowl on floor and make your dog sit whilst standing over the bowl walk one step backwards and then allow your dog to eat his food.
By doing this you are claiming the food , you letting him know you are the provider and he is privileged to able to have some food.

When you first try this and place the bowl on the floor your dog will try rushing to the bowl do not allow this only let him her eat when you say so .

There are additional methods you could try with this technique . Try this first and see how you progress.
Please do join our Face Book Group found here Log in | Facebook

Good luck and Enjoy your dogs The Dog Master Lets Go Walkies