The World Obesity Federation says over half of the global population will be classed as obese or overweight by 2035.
In its latest report, the federation said more than four billion people will be affected, including children and urged governments to act.
According to the report, the countries expected to see the greatest increases are low or middle-income countries in Africa and Asia.
This is due to trends such as preferences for highly processed foods, more sedentary behaviour, weaker policies to control food supply and marketing, as well as less well-resourced healthcare services to assist in weight management and health education.
The World Obesity Federation predicted that by 2035 the financial cost of obesity will amount to $4tn annually.
Writing by Annabel Nwachukwu