Governments around the world are keeping an eye on their national waistlines as they try to crack down on obesity epidemics. But in Scotland, where research suggests that the vast majority of marketing is promoting junk foods, the country’s finding it hard to cut down on calories.

Coke is addictively fizzy and OJ is a deliciously sweet nectar, especially for kids. How has AquaBall – water with no sugar, artificial colours, flavours or calories – nabbed 2% market share in two short years? What’s in AquaBall’s recipe that makes it such a success?

Just under a quarter of children in London are obese, and with over 8,000 fried chicken shops spread across the capital, junk food is a major contributing factor. Tottenham-based Chicken Town offers up a healthy alternative to the greasy meal, but will school kids be able to stomach it?

In a move to tackle obesity, US schools will have to replace junk food with 'smart snacks' like granola bars and fruit cups in 2014-2015. But can deeply ingrained habits really be changed when a new study shows kids are less likely to choose foods they know are good for them?