A longevity expert has shared a "superfood" we should all be consuming daily to extend our lives. Drawing inspiration from the diets of those living in Blue Zones, he encouraged people to eat at least half a cup of this food each day. Blue Zones are areas around the world with reduced rates of chronic illness and extended life expectancy. They generally have more centenarians than anywhere else on the planet. Numerous factors contribute to this, but diet is recognised as a significant one ,