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Distrubution of population by BMI index in Belgium 2018

The World Health Organization classifies four main groups of people according to their Body Mass Index (BMI): underweight, normal weight, pre-obese, and obese. In 2018, roughly half of the Belgian population fell in the normal weight group. However, a third of the population fell in the overweight group.

The BMI ranges are based on the effect excessive body fat has on disease and death and are reasonably well related to adiposity. Over the benchmark of 29.9, the BMI can be further divided into Obesity classes: one (30-34.9), two (35-39.9), and three (40+). In Belgium, roughly 16 percent of people fell into one of these categories in 2018.

Distribution of the Belgian adult population according to their Body Mass Index (BMI) in 2018*

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Release date

October 2019



Survey time period


Number of respondents

9,594 respondents

Age group

18 years and older

Method of interview

Face-to-face interview

Supplementary notes

The BMI of respondents is dividing the weight in kilograms by the height in meters, squared.

The results have been weighted to represent the entire population of Belgium using a logistic regression by age and/or gender.

No proof of height and weight has been requested. Therefore, the figures are based on the respondent's statement.

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