The BMI average was found to be at a higher level for both males and females, and also across all social groups.

However, when the researchers looked at the figures for those participants in the top and bottom of the study they found that there were marked differences, with much greater increases at the top end of BMI values.

Researchers analysed data from the Health Survey for England, an annual health survey that captures health information including height and weight measurements for adults aged over 20 and examined trends in BMI distribution over a period of 21-years.

The data, published in the Journal of Epidemiology and Community Health, was evaluated in a more detailed way to see if there were any trends in peoples' BMI according to their sex and social group by looking at the respondents' education level.

BMI is a widely used method for assessing a person's weight and is calculated by dividing a person's weight by their height.

Currently, 66 percent of men and 57 percent of women are classified as overweight or obese.


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