Can heavy water have an impact on longevity?

From the UK’s Daily Mail:

“Scientists believe that ‘heavy water’ enriched with a rare form of hydrogen could add as much as 10 years to life.

Foods, from steak to eggs, could also be modified to allow us to eat and drink our way to a healthy old age. The idea is the brainchild of Mikhail Shchepinov, a former Oxford University scientist, who counts controversial ageing guru Aubrey de Grey among his admirers.

It centres on fortifying the body’s tissues and cells against attack and decay caused by free radicals, dangerous chemicals produced when food is turned into energy. […]”