In many countries of the world, most variation in children's height and weight is due to differences in the:

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Research has consistently shown that the availability of nutritious food plays a major role in children's height and weight. Lack of access to a balanced and healthy diet can cause stunted growth and malnourishment in children, particularly in low-income and food-insecure communities. While physical activity and environmental factors also contribute to children's growth and development, the impact of proper nutrition is of utmost importance.

In Many Countries of the World, Most Variation in Children's