Fifth of people will be obese by 2025

People are plumping up at such a rate that by 2025 roughly a fifth of the human race will be obese, experts have warned.

Over a period of 40 years from 1975 to 2014 the number of men and women in the world classified as obese soared from 105m to 641m, research shows.

With each passing decade, the average person had become 1.5kg heavier.