i would start by cutting out any fizzy soft drinks if he has those, they can be pretty bad, even the sugar free ones. things like sliced (processed) cheese and chips have quite a few numbers and i know DD reacts to them.

I think a small ammount of sugar is fine, if im making cakes/muffins etc i try to use half soft brown sugar and half honey instead of white/raw sugar. its so hard to read everything and remember so many numbers to avoid. WHat we did was just avoid ANYTHING that was processed, so no woolies cakes/biscuits etc as they all have things in them to keem them fresh onthe shelf for longer. ANything that isnt bassically a 'whole food' i.e fruit veg grains etc. get your bread from a bakery. try to make your own things which you would normally buy...ie, nuggets, burgers, fish bites etc. it can be quite time consuming but they great thing i found was that DD LOVED to help and will sit on the side and cook with me and eat stacks more cause she helped cook it!

then you can start adding things back in, like find a good cheese with no numbers, or a drink he can have which has no numbers, things like peanut butter and humous that your not going to make yourself, find a good brand and stick with that one, i found it easier that way.

anyway , thats just what we did and i found it alot less overwhelming! now i can tell withing 10-20 mins when DD has something i wouldnt normally give her, like chips or soft drink, cause she goes mental and its a good reminder of why we changed her diet! Good luck, i hope it makes a difference for you!

edit: just read the post above.....basically what i was trying to say