American research finds no evidence to link certain foods or ingredients to increased cancer risk. Bacon, tea and burnt toast have all been linked to increased cancer risk in the past. There have been innumerable articles that have pointed to a risk of cancer from consumption of certain foods such as burnt toast and low fat salad dressing. "When we examined the reports, we found many had borderline or no statistical significance," said Dr Jonathan Schoenfeld of the Harvard School of Public Health in Boston. Scientists studied the statistical significance of these studies to find just how many times an ingredient was going to elevate the risk of cancer. "We found that, if we took one individual study that finds a link with cancer, it was very often difficult to repeat that in other studies," said Schoenfeld. "People need to know whether a study linking a food to cancer risk is backed up before jumping to conclusions."