Watson's controversial hypothesis about cause of diabetes, dementia, heart disease and cancer published in medical journal
Not satisfied with his work that unravelled the double helix structure of DNA and landed him a share of a Nobel prize half a century ago, James Watson has come up with a radical theory for diabetes, dementia, heart disease and cancer.
The 85-year-old scientist has turned to the pages of the Lancet medical journal to set forth his grand idea, which some academics say may not have seen the light of day had it come from anyone else.
Watson, who stepped down as director of the Cold Spring Harbour Laboratory in New York in 2007 after the Times quoted his views on Africa and intelligence, has arranged a conference at the lab this year to explore his latest hypothesis.
Writing in the Lancet, Watson claims that late onset, or type 2 diabetes, is traditionally thought to be caused by oxidation in the body that causes inflammation and kills off pancreatic cells. But he thinks the root of that inflammation is quite different: "The fundamental cause, I suggest, is a lack of biological oxidants, not an excess," he writes.
Watson, a keen singles tennis player, says he developed his theory after pondering why exercise seemed to benefit people with high blood sugar, an early indicator of future diabetes. Exercise produced "reactive oxygen species" that were widely thought to be harmful.
Other research fed into his thinking, chiefly a study by Matthias Blüher at the University of Leipzig. He showed that reactive oxygen species released in exercise combatted the insulin resistance seen in diabetes, but that the benefits vanished if you gave people antioxidants before the exercised.
Watson believes that rather than being wholly bad, oxidising molecules, such as hydrogen peroxide, are crucial for the body's health. In particular, he points out that hydrogen peroxide goes to work in a cellular organ called the endoplasmic reticulum, where it ensures proteins are stable. If levels of oxidants are too low, he suggests, the proteins become misshapen and cause the inflammation that damages the pancreas. And a raft of other diseases.