This is completely the opposite of what I would do, and in telling him off/taking things away, you are simply teaching him that someone around his food bowl is a threat. Food aggression is not like other forms of aggression - any dog can have food aggression, it doesn't mean they are generally aggressive, nor does it mean they are dominant or any other reason people give, and trying to assert authority over food may make him more 'obedient' around food when you're around... you can extend this to your children too, but it will not make him comfortable and relaxed with people around food.

I always start by adding food to the bowl as a young pup. Give half his meal and when he is nearly finished add more. Basically you are conditioning him that 'good' things happen around his food bowl - not bad, it's not something he has to be wary of or needs some sort of 'authority' to obey. What you are aiming for is a dog that is more than happy for you to approach his bowl because then good things happen. You can then get others to do it too. By touching him/taking things away/telling him off, you are teaching him unpleasant things happen. Many dogs never show any problems despite this, but why risk it when it is so easy to make a dog happy and relaxed with you being around it's food bowl?