Professor James Nazroo, a specialist in health inequality at the University of Manchester, says the scientific community have yet to come up with convincing evidence to put biology over socio-economic differences.

BBC: Cancer's ethnic divide?

Studying coral reefs in the western Indian Ocean, the researchers of the report published in "Current Biology" found that overfishing is at its worst in areas that are socio-economically underdeveloped.

CNN: Beating poverty could save coral reef fish, report says