Omega 3 fatty acids could increase the risk of high-grade prostate cancer by 71 per cent, according to a new study.
Scientists confirmed that omega-3 fatty acids "play a role in prostate cancer occurrence".
It was found that men with the highest levels of omega-3 fatty acids were significantly more likely to be diagnosed with prostate cancer than those with lower levels.
High blood concentrations of all three omega-3 fatty acids, commonly found in supplements EPA, DPA and DHA, were linked to the findings.
People have previously taken omega-3 supplements to protect against heart attacks and strokes, cope with arthritis, boost concentration levels and prevent behavioural disorders in children.
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Mr Kim has made two recent visits to China.
The study looked at the development of 422 children over the course of eight years.
The president said they will come into force if China refuses to change its practices.