“What happens if you go to the NHS and they say, ‘Well we can see that you’ve been buying chocolate, so this health condition is your own fault and we’re going to charge you more’? You might be denied insurance or lose out on a job and you won’t be able to trace back what the decision has been based on. It may sound extreme but I think we’re getting closer to the point where these things will happen,” says Dr Oostveen. "It’s likely that it will be used for things we never thought were possible and it will have far-reaching consequences.”