the rising tide of obesity extends into adulthood with 1.9 billion adults worldwide overweight , 600 million of which are classified as obese .
but with experts desperately trying to find the answer , a poignant debate rages .
should fast food and sugary drink companies be allowed to advertise their junk food and drink be banned until the watershed , or wiped out altogether to save adults ' waistlines too ? a recent survey by the british heart foundation survey quizzed more than 2,000 parents with children under the age of 16 .