This is pretty much an object lesson in how commercialism directly affects your health. I can't really improve on the advice given in this article, they sort of say it all.
If it wasn't grown in your own back yard, you have no idea whatsoever what the commercial interests all along that supply chain have done in order to get their hands on a few extra precious dollars.
Did the growers use radioactive fertilisers on the tomatoes you're eating? Don't laugh, in the US it's perfectly legal to ship poisonous radioactive crap across a state border where they can legitimately add it to fertilisers. And don't laugh because you're in Australia, because several million tons of the shit found its way into Australian soils as fertiliser, before someone figured it out and put a stop to it.
Did the transport company save some loading and put the tomatoes in the same shipment as some insecticide, and by any chance did one of those barrels leak and contaminate the whole load? Again, don't laugh, because that has happened right here in WA, a long time ago I'll grant you, but we had to dump a whole load of groceries in the bush town I lived in as a kid becuase of precisely that.
And then - the supermarket. Did they store those tomatoes for six months before putting them on the shelves? Because they all do that. There are guidelines for the length of time you may store vegetables, but it's been proven over and over by reporter and investigators that these are being well and truly ignored and that our vegetables only get to us when they have become protoplasm with almost zero health benefits.
So if you feel slightly violated and raped, it's because we're all copping that, in the interest of the mighty dollar. Grow your own or get used to the sting...