What causes stunting? The World Health Organization (WHO) calls growth stunting one of the most significant impediments to human development.

Stunting is described as, low height for age or a height more than two standard deviations below the WHO Child Growth Standards median.

It is estimated 162 million children under the age of five are stunted worldwide.

According to The Future of Children, stunting is an indication of malnutrition or nutrition related disorders. Contributing factors include poor maternal health and nutrition before, during and after pregnancy, as well as inadequate infant feeding practices especially during the first 1,000 days of a child’s life and infection.

In a global study, UNICEF explains that nearly half of all deaths of children under the age of five are attributable to chronic malnutrition. In one year, that’s a loss of nearly three million lives.

Malnutrition doesn’t only lead to decreased stature. Malnutrition increases the risk of dying from common infections, the frequency and severity of such infections and contributes to delayed recovery. According to UNICEF, the relationship between malnutrition and infection can create a potentially lethal cycle of worsening illness and deteriorating nutritional status.

The effects of stunting are lasting and generally irreversible. Children over the age of two who are stunted are unlikely to be able to regain their lost growth potential. In addition, children who experience stunting have an increased risk for cognitive and learning delays.

The effects of malnutrition on a population have broader impacts. Malnutrition perpetuates poverty and slows economic growth. Reports from the World Bank show that as much as 11 percent of gross national product in Africa and Asia is lost annually to the impact of malnutrition.

A study looking at the long-term effects of stunting in Guatemala showed adults who were stunted as children received less schooling, scored lower on tests, had lower household per capita expenditure and a greater likelihood of living in poverty. For women, stunting in early life was associated with a lower age at first birth and a higher number of pregnancies and children.

The World Bank estimates a 1 percent loss in adult height due to childhood stunting is associated with a 1.4% loss in economic productivity. Further estimates suggest stunted children earn 20 percent less as adults compared to non-stunted individuals.

In 2012, the World Health Assembly endorsed a plan to improve maternal, infant and young child nutrition by 2025. Their first target: a 40 percent reduction in the number of children under the age of five who are stunted.

Overall, progress has been made. UNICEF reported between 1990 and 2014 the number of stunted children under five worldwide declined from 255 million to 159 million. Today, that is just under one in four children under the age of five who have stunted growth.

At the same time, numbers of stunting have increased in West and Central Africa from 19.9 million to 28.0 million. As of 2014, just over half of all stunted children live in Asia and over one-third reside in Africa.

– Kara Buckley

Sources: World Bank, UNICEF, The Future of Children, World Health Organization 1, World Health Organization 2
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