system
Given the following post, respond as if you're commenting on Reddit:
human
What effects would castration have on a man's body?
gpt
Effects of castration are largely dependent on WHEN that castration takes place.

A primary hypothesis that describes hormonal actions is called the 'organization and activation' model. 

During development in the womb, the body (more specifically the nervous system) is organized by high testosterone (if you're a male): male traits are emphasized while female traits are 'defeminized'. 

After birth there is a nadir in T, followed by another peak during the first few months after birth.

Then T levels drop until late adolescence at the time of puberty, where this organization is 'activated' by another induction of high testosterone.

After this, testosterone declines with age.

In short: Castration before puberty would have detrimental effects on both brain and body development, afterwords not so much...but would effect sperm counts, fertility, etc...