So full of chemical residue are some farmed salmon, a 2004 study concluded that people should not eat them more than three times a year.

Certainly the rapid growth in consumer demand for organic food suggests that many consumers are increasingly wary about ingesting chemical residue on conventionally farmed food.

He added that it would expose people to twice as many chemical residues from pesticides.

An outbreak of the disease may be controlled chemically with oxytetracycline hydrochloride, but honey from treated colonies could have chemical residues from the treatment.

Also, studies of chemical residues have huge implications on food toxicity.