Ahh yes I forgot about teething, that would always cause DS to go off his food for a week or so (depending on how stubborn the tooth is) and considering thier gums hurt it is hardly surprising. If you are really worried you could rub some teething gel on their teeth say 10 mins or so before hand. I personally didn't bother but it's an option.
DId you find he would still eat his favourite foods when he was teething? Tonight the only part of dinner that DS would eat was a few pieces of broccoli. After about 30 mins of mucking around I offered him some pear which he ate half of and then a tub of yoghurt... Not sure if I'm doing the wrong thing by offering that sort of stuff when he doesn't eat, but then I normally do that after dinner when he does eat what I give him...

Sorry to hijack your thread Heva.