The number of obese children and adolescents (aged five to 19 years) worldwide has risen tenfold in the past four decades.

 

 

 

 

 

 

 

 

If current trends continue, more children and adolescents will be obese than moderately or severely underweight by 2022, according to a new study led by Imperial College London and WHO.The study was published in The Lancet ahead of World Obesity Day (11 October).The paper presents the first ever comprehensive data on underweight through to obesity for children and adolescents aged five to 19 years and provides startling findings on the increasing numbers and rates of young people being affected by obesity.The study calculated and compared body mass index (BMI) among children, adolescents and adults from 1975 to 2016, and made projections based on current trends in obesity rates.BMI is a measure of a person’s weight and body fat mass for their height, and indicates whether their weight is healthy.

Calculating BMI is the simplest way to assess a person’s weight status, and the most common tool used to determine under-, healthy- and overweight and obesity. For children and adolescents, their BMI is adjusted for age and sex using WHO’s growth reference curves.Action to curb obesity is a key element of the 2030 Agenda for Sustainable Development. Sustainable Development Goal (SDG) target 3.4 commits the world to reducing premature deaths from NCDs by one-third by 2030, including through prevention of obesity. SDG target 2.2 commits the world to ending all forms of malnutrition by 2030, including overweight and obesity. Also, the goal of the United Nations Decade of Action on Nutrition (2016-2025) is to promote collaboration across all sectors and stakeholders to end malnutrition in all its forms.

The findings also showed that:

Global data for obesity and underweight

In 2016, there were 50 million girls and 74 million boys with obesity in the world, while the global number of moderately or severely underweight girls and boys was 75 million and 117 million respectively.

The number of obese adults increased from 100 million in 1975 (69 million women, 31 million men) to 671 million in 2016 (390 million women, 281 million men). Another 1.3 billion adults were overweight, but fell below the threshold for obesity.

Regional/Country data for obesity, BMI and underweight

Obesity

The rise in childhood and adolescent obesity rates in low and middle income countries, especially in Asia, has recently accelerated. On the other hand, the rise in childhood and adolescent obesity in high income countries has slowed and plateaued.

In 2016, the obesity rate was highest in Polynesia and Micronesia in boys and girls, at 25.4% in girls and 22.4% in boys, followed by the high-income English-speaking region, which includes the USA, Canada, Australia, New Zealand, Ireland and the United Kingdom.

The areas of the world with the largest increase in the number of obese children and adolescents were East Asia, the high-income English-speaking region, and the Middle East and North Africa.

Nauru was the country with the highest prevalence of obesity for girls (33.4%), and Cook Islands had the highest for boys (33.3%).

In Europe, girls in Malta and boys in Greece had the highest obesity rates, comprising 11.3% and 16.7% of the population respectively. Girls and boys in Moldova had the lowest obesity rates, comprising 3.2% and 5% of the population respectively.

Girls in the UK had the 73rd highest obesity rate in the world (6th in Europe); boys had the 84th highest obesity in the world (18th in Europe).

Girls in the USA had the 15th highest obesity rate in the world; boys had the 12th highest obesity in the world.

Among high-income countries, the United States of America had the highest obesity rates for girls and boys.

BMI

The largest rise in BMI of children and adolescents during the four decades was in Polynesia and Micronesia for both boys and girls, and in central Latin America for girls. The smallest rise in the BMI of children and adolescents during the four decades covered by the study was seen in Eastern Europe.

The country with the biggest rise in BMI for girls was Samoa, which rose by 5.6 kg/m2, and for boys was the Cook Islands, which rose by 4.4 kg/m2.

Underweight

India had the highest prevalence of moderate and severe underweight throughout these four decades (24.4% of girls and 39.3% of boys were moderately or severely underweight in 1975, and 22.7% and 30.7% in 2016). 97 million of the world’s moderately or severely underweight children and adolescents lived in India in 2016.