A 23% rise in obesity-related strokes has been predicted by 2050.
Other increases in obesity-related ill-health are also predicted for that year – high blood pressure will rise by 34%, coronary heart disease by 44%, and diabetes by 98%.
The figures were revealed in a survey saying eight in 10 men and almost seven in 10 women will be overweight or obese. It said some 41% of men aged 20 to 65 will be obese and 40% will be overweight; and 36% of women will be obese and 32% overweight.
However, the data also suggest childhood obesity may be levelling off.
Led by Professor Klim McPherson from Oxford University, who is also chair of the 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."