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Poor diet and nutrition may behind an average height gap of 20cm between the tallest and shortest children in different countries. Researchers from Imperial College London a global of the Body Mass Index (BMI) of schoolchildren and adolescents around the world. This measuring the height and weight of millions of children and teenagers. They that the world's tallest 19-year-olds, at 183.8cm, in the Netherlands, while the shortest, at 160.1cm, in East Timor. The researchers teenagers in northwest and central Europe the tallest in the world. On average the shortest children in South and South-East Asia, Latin America and East Africa.

The study extremely comprehensive. It analysing data from 65 million children aged five to 19 years old in 193 countries. The researchers that children's height and weight enormously in different regions. The team that a lack of quality food and nutrition was a major factor behind stunted growth and a rise in childhood obesity. It said diets increased the average height of children in China. Nineteen-year-old boys there were 8cm taller in 2019 than in 1985. Researchers this to improved nutrition. The lead author of the report countries to adopt policies that healthier eating, but to aware of the perils of excessive weight gain.