I have just watched a TED.com video on a longevity study by Susan Pinker (sister to evolutionary psychologist Steven Pinker) The message is: the biggest predictor is the close, friendly society you live in, and close relationships with family and loved ones. Fakebook (eg) just doesn't cut it. Video conferencing is unlikely to have any effect unless you both look the camera squarely in the lens, but she speculated. And diet was not on the list of predictors. But I would bet "some diets" is on the list of predictors of shorter life span. As is stress.
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