I wouldn't let this get you down too much........this is from the end of the article, an extract.
I tend to go along with the good Dr's rationale:
Dr Laura Bell, Cancer Research UK's science information officer, said: "This is an interesting study looking at blood-sugar levels and cancer risk, but it's really only looking at one part of a complicated picture.
"Research consistently shows that what we eat and drink, our levels of physical activity, our body weight – and, of course, smoking – all play a part in our cancer risk. Studies like this can help us to understand more about these links, and adds to the evidence that a healthy diet and staying active can help to reduce the risk of cancer, as well as many other diseases."