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Insulin pumps are vulnerable to determined hackers who could also remotely mess up the readings of blood-sugar monitors, Jerome Radcliffe, a security researcher who has diabetes revealed at the Black Hat computer security conference, Las Vegas, Nevada. In other words, a hacker could cause a diabetic patient to receive either too much or too little insulin.

Taking genetic tests to assess potential health risks could mean cheaper medical insurance even if the results are not disclosed, a senior industry executive has told The Times. Customers who take personal DNA scans will pay lower premiums because insurers believe that they encourage a healthier lifestyle, according to Gil Baldwin, the managing director of Norwich Union Healthcare. The advent of tests for DNA variants that affect common disorders such as diabetes and heart disease has prompted fears of discrimination and the creation of a "genetic underclass" who cannot buy cover. Mr Baldwin insisted that his company did not see genetics as a tool for cherry picking low-risk customers but as a way of helping them to manage and reduce their risk of disease with the aim of lowering costs for both parties. In an interview with The Times, he said that people who take genetic screening are likely to act on the results and therefore present a much better risk profile. Insurers will reflect this in premiums, regardless of whether results are disclosed.