system
Given the following post, respond as if you're commenting on Reddit:
human
Why is the average height of humans increasing over time?

Napoleon, who was known for his short stature, was average height in his day. During the American Revolution, the average male height was 5'6. 

Does this mean that taller people are "fitter" to survive?
gpt
Increased access to nutrition and healthcare has lowered rates of stunted growth in children. Global development has limited famine and lowered disease loading that draws on energy that would otherwise go to growth.