Forum debate debunks the myth that mixing lowered average height

The height myth that mixing supposedly lowered

In a forum thread, one participant claims that the indigenous peoples of the Americas averaged **1.90 metres** tall and that mixing with European colonizers, who stood at **1.40**, would have lowered average height to today's **1.60**. The idea keeps popping up in certain corners of the online conversation, usually presented without much evidence. The problem is that the story's own arithmetic falls apart on its own.

If the Europeans who arrived in the Americas were 1.40 and the locals 1.90, the weighted average of any reasonable mix would not be 1.60. It would be higher. And if the goal was to explain why some countries today have low average heights, the correlation runs the other way: regions with a larger share of indigenous population tend to show the lowest average heights, not the opposite. The data leaves proponents of the mixing theory at a loss.

What the evidence says about average height

The average height of a population depends on documented factors: **nutrition**, **healthcare**, **income** and **access to animal protein** during childhood. Not on some supposed genetic cocktail that shaves off centimetres by decree. The countries with the largest indigenous populations in Latin America generally have the lowest average heights on the continent. Those with a mostly European composition, the highest. The relationship is the opposite of what the myth claims.

Some argue that Spanish colonization imposed a regime of **exploitation** that impoverished local populations, and that this did affect their physical development. That argument is different and has more substance: structural poverty, not genetics, explains much of the gap. But conflating the two is what turns the discussion into gibberish.

The story as a weapon

The height myth works as ammunition in a broader culture war. On one hand, it is used to blame colonization for all present-day ills. On the other, those who repeat it are ridiculed by pointing out that if the conquistadors were so short and so exhausted, it is hard to explain how they prevailed over populations described as taller and better fed. The paradox is the most effective argument against the theory itself.

The discussion takes place in a context of **inferiority complexes** and identity issues that go beyond anthropometry. Height becomes a metaphor for historical grievances, and there the data stop mattering. What matters is who ends up being blamed.

Why height is not inherited like a subtraction

The genetics of height are polygenic: hundreds of variants are involved and the environment modulates their expression. There is no mechanism by which a tall population and a short one produce systematically intermediate offspring. An individual's final height depends on their specific genetic makeup and the conditions in which they grow up. Population averages shift through selection, migration and environment, not through a rule of three.

The puzzling data point: if mixing had lowered height from 1.90 to 1.60, it would be necessary to explain why populations without significant mixing today have the lowest heights on the continent. The theory is left without an answer.