A few of us on the other thread are keen to know the answer to this. In my case, I need to limit the amount of processed meat we eat, as my mum has bowel cancer and there's a hereditary link . I know the saltiness of ham isn't great, but I think (though I don't know for sure) that it's the nitrates (and sulphites??) in processed meat that are the real baddies, which wouldn't be there in ham you cooked yourself.
Anyone a food scientist, or nutritionist, or just know?