By 2035, just over half of the world's population will be classified as obese or overweight, according to the Global Obesity Federation, which is pleading with governments to take action.
More than four billion people will be impacted, according to its most recent assessment, and children are particularly susceptible.
It claims that almost all of the nations anticipated to experience the biggest increases are low- or middle-income nations in Asia and Africa.
Weaker policies to control food supply and marketing, higher levels of sedentary behaviour, changes in dietary preferences towards more highly processed foods, and inadequate funding for healthcare services to help with weight management and health education are some of the causes.
By 2035, the federation projects that the yearly financial cost of obesity will reach $4 trillion.
