Despite tons of public health campaigns, the rise in worldwide obesity rates continues to grow rapidly. In 2014, more than 640 million men and women were reported to be obese.

That's up from 105 million in 1975 from a study in which researchers analysed four decades of height and weight data for more than 19 million adults, and then calculated global rates based on population data.

On average, people worldwide are gaining about 1.5kg per decade which is roughly the weight of a half-gallon of ice cream.