Salt is just in bloody everything!
My 3 year-old is supposed to have a maximum of 2g per day.
There is nearly 1g in a slice of bread! Most sasuages have over 1g. Half a can of baked beans is 2g - even the reduced salt versions hardly knock anything off this.
Not to mention breakfast cereals, cheese, ham ... basically anything she will actually EAT. (She gags on fruit and vegetables to the point where I am no long encouraging her to eat them because she's thrown up so many meals after I've done so.)
What's left? The only way I can reduce her salt intake is to make her live on chocolate.