Just a thought, what would yellow-cake do if it was injested in enough quanity?
The uranium type or granma's favorite yellow cake?
I dunno. I ONLY eat Chocolate-cake. If you mean Uranium, these guys would have to eat several tons of ore; get centrifuged somewhere around the speed of sound and go through a couple of enrichment cycles. I think somebody intentionally poisoned their food with multiple organics and inorganics. Just a hunch about Warfin and DMSO. There are a couple other inorganics that could have been used, but the smell and taste would be very difficult to mask under ordinary circumstances.