We all know that our diets can have a great impact on our health and weight,but could it also affect how we grow in height？This is what researchers from the Imperial College of London suggest in a paper recently published in The Lanceu（《柳叶刀》），based on a study of 65 million children and teens from 193 countries.
The researchers found notable differences in height between children of the same age living in different countries,they examined diet as a potential reason behind the distinction.The researchers analyzed data from 2，000 studies that tracked the height and weight of school-aged children worldwide between 1985 and 2020.They found there was an average height difference of approximately 8 inches in children between the tallest nation and the shortest nation.
Researchers also examined the Body Mass Index（BMI）levels that measure whether a person has a healthy weight for their height.They found that teenagers in the Pacific Islands,the Middle East,the U.S.and New Zealand had the largest BMI，while teenagers in South-Asian countries such as India and Bangladesh had the lowest BMls.
So how do the researchers explain such big differences in height between children growing up in different places？
We know that our height is partly determined by our genes.But it seems that our diets can also play an important role.In fact,studies have shown that while 60-80% of the difference is due to genetics,20-40% is due to environmental factors.In some developing countries and poorer areas,lack of nutrition explains the height differences.In these areas energy and nutrient-rich foods are less readily available to school-aged children,thus leading to a tendency for stunted（不足的）growth or obesity.Overall,the study reveals a clear link between children's diet and how they grow in their formative years.
Since stunted growth impacts a persons health and happiness,it is necessary to invest in better global nutrition policies that focus on the growth patterns of children.Healthy school meals that are currently under threat during the pandemic（全国性流行病）are a good starting point to guarantee that all children have better access to nutritious foods.



What result can we learn from the research？ ______

A. Western countries are the tallest nations.
B. Children in developed countries eat better.
C. People of the same age differ in BMI levels.
D. What we eat makes a great difference in height.

What does the fourth paragraph mainly concern？ ______

A. Main factors for the height gap.
B. Major breakthroughs in human genes.
C. Methods of getting nutrition for children.
D. Measures to take to prevent stunted growth.

What idea does the passage convey in the last paragraph？ ______

A. Schools are most accessible for children.
B. Make sure children have a healthy diet at school.
C. Global nutrition policies should be passed soon.
D. Stunted growth influences the well-being of a family.

What's the purpose of writing the passage？ ______

A. To state the reward of a nutritious diet.
B. To highlight how daily diet affects height.
C. To draw people's attention to children's height.
D. To appeal for equal nutritious food in poor areas.