Most men and women will be obese by 2020
Eight out of 10 men and almost seven in 10 women will be overweight or obese by 2020, according to a new study in the UK.
While data suggests childhood obesity may be levelling off, the picture for adults is "less optimistic".
Not only will people be fatter but the incidence of diabetes, stroke and heart disease will dramatically increase, the report added.
Led by Professor Klim McPherson from Oxford University, who is also chair of the UK's national heart forum, the study updates predictions in a 2007 Foresight report, which was based on data from 1993 to 2004.
The latest research uses complete figures from 1993 to 2007 to predict future levels of obesity in England.
The study said: "Unlike the recent report on child obesity, which showed some indications of a plateauing or at least a significant reduction in the rate of obesity, the future projections for adults are less optimistic."
Cathy Moulton, care advisor at Diabetes UK, said: "This new report paints a gloomy picture of the future state of the UK's health. Type 2 diabetes accounts for 90pc of all cases of diabetes and obesity is one of its leading causes."