I worked with a manager that looked after the mainframe and he always told me to never assume. Assuming genetics is the assumption with nutrition and health, with this not always being helpful. Regardless of our genetics, what we eat and how we move can always move the needle on our health outcomes.

Ancel Keys and his work on diet and longevity is pertinent to this article. He discovered that the people that lived the longest had a low saturated fat plant-based diet. This was to be found in the 'blue zones' around the world. This does not mean exclusively vegan, but getting that way.

Keys had to make some recommendations to the U.S. government and he went for the Mediterranean Diet rather than what they were eating in Okinawa. This was because the Second World War was fresh in people's memories at the time and telling Americans to eat like Japanese people was not going to be well-received advice at the time.

The Japanese diet has changed since the post-war years with the processed foods, animal products and saturated fats rather than what you might call a peasant diet. It is also the same with the Mediterranean Diet, which is not 'pizza, pasta, red wine and meat from imprisoned animals'.

Also important is that most Japanese live in walkable neighbourhoods. Japan is a cycling nation so cycling happens too, not this lycra + polystyrene hat cycling from the parking lot and back to the parking lot that passes for cycling in the West, but everyday cycling on bicycles that are designed for comfort and getting about in regular clothes.

We all like our fat, sugar, salt and motor cars, however, those that were deprived from these joys due to war do well in the longevity stakes.