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Why have average adult heights increased in many countries since the 19th century?
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human development
Growth of the human fetus from the fourth month to the ninth month of pregnancy.
Since the 19th century, average adult height has increased globally primarily due to significant improvements in environmental factors rather than genetic changes. While an individual's potential height is determined by their genes, the extent to which that potential is realized depends heavily on nutrition, health, and socioeconomic conditions.12
Key drivers of this trend include:
- Improved Nutrition: Access to a nutrient-dense dietārich in protein, calcium, zinc, and vitamin Dāis essential for proper bone formation and growth during childhood and adolescence.12
- Public Health Advancements: Better sanitation, water supply management, and the control of infectious diseases have reduced the burden of chronic illnesses that can divert energy away from physical development.13
- Socioeconomic Equality: Societies with greater equality often provide more consistent access to healthcare and quality living conditions, which are strongly correlated with taller average stature.12
In many developed nations, this trend has leveled off as populations have reached their genetic height potential, whereas gains continue in regions where living conditions are still improving.1