"The sandeel props up the whole of the North Sea food chain, including the poor old beleaguered cod, " said Dr Euan Dunn, from the Royal Society for the Protection of Birds (RSPB).
When Dr Hugh Sinclair persuaded the British government in 1942 to supplement children's diets with orange juice and cod liver oil, he speculated that among other ills, poor diets could lead to anti-social behaviour.