According to WHO(World Health Orgination), What is Excess weight

Important Facts

Since 1975, obesity has nearly tripled worldwide.
In 2016, more than 1.9 billion adults aged 18 and above were overweight. Of these, over 650 million were affected by obesity.
In 2016, 39% of adults aged 18 and over had excess weight, and 13% were obese.
The majority of the world's population resides in countries where overweight and obesity lead to more deaths than underweight.
In 2020, 39 million children under the age of 5 were overweight or obese.
In 2016, over 340 million children and adolescents aged 5-19 were overweight or obese.
Obesity is preventable.

What is obesity and overweight?

Overweight and obesity are characterized by abnormal or excessive fat accumulation that may harm health.
Body Mass Index (BMI) is a simple indicator of weight-for-height commonly used to classify overweight and obesity in adults. It is calculated as a person's weight in kilograms divided by the square of their height in meters (kg/m²).

For adults, WHO defines overweight and obesity as follows:

Overweight is a BMI greater than or equal to 25.
Obesity is a BMI greater than or equal to 30.
BMI provides a useful population-level measure for adults as it remains the same for both genders and all adult age groups. However, it should be considered a rough guide, as it may not reflect the same level of fatness in different individuals.

For children, age is a crucial factor in defining overweight and obesity.

Children under 5 years of age:

Overweight is weight-for-height greater than 2 standard deviations above the WHO Child Growth Standards median.
Obesity is weight-for-height greater than 3 standard deviations above the WHO Child Growth Standards median.

Charts and tables: WHO child growth standards for children aged under 5 years

Children aged between 5–19 years:

Overweight is BMI-for-age greater than 1 standard deviation above the WHO Growth Reference median.
Obesity is greater than 2 standard deviations above the WHO Growth Reference median.

Charts and tables:  WHO growth reference for children aged between 5–19 years

Facts about overweight and obesity
Some recent WHO global estimates are as follows:

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In 2016, more than 1.9 billion adults aged 18 and older were overweight, with over 650 million being obese.
In 2016, 39% of adults aged 18 and over (39% of men and 40% of women) were overweight.
Globally, about 13% of the adult population (11% of men and 15% of women) were obese in 2016.
The worldwide prevalence of obesity nearly tripled between 1975 and 2016.
In 2019, an estimated 38.2 million children under the age of 5 years were overweight or obese. Overweight and obesity, once considered issues in high-income countries, are now increasing in low- and middle-income countries, especially in urban areas. In Africa, the number of overweight children under 5 has increased by nearly 24% since 2000. Almost half of the overweight or obese children under 5 in 2019 lived in Asia.

Over 340 million children and adolescents aged 5-19 were overweight or obese in 2016.

The prevalence of overweight and obesity among children and adolescents aged 5-19 has risen dramatically from just 4% in 1975 to just over 18% in 2016. The increase has been similar among both boys and girls: in 2016, 18% of girls and 19% of boys were overweight.

While just under 1% of children and adolescents aged 5-19 were obese in 1975, more than 124 million children and adolescents (6% of girls and 8% of boys) were obese in 2016.

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