The detective ate a slice of bread, seemingly made of wheat. The criminal showed up as the detective began to choke. The detective's last words were:
"<choke> Y-y-you put... rice <gasp> in... in this b-bread!"
Indeed, this was true, but does it make sense? The detective had no intolerance for rice, yet his last words perfectly summed up the reason for his death.
Please explain logically, without the use of "He was going delusional!", or "He had a heart attack!", etc., as the answer must be able to be derived from only the detective's last words.