A certain tropical island received food donations in the form of powdered milk for distribution to its poorest residents, who were thought to be malnourished  Subsequently, the rate of liver cancers among those islanders increased sharply  The donated milk was probably to blame: recent laboratory research on rats has shown that rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein
This result is relevant because
casein is not the only protein contained in milk