Why do humans with no ovaries or testicles need to take hormone supplements to stay healthy, but animals who have been neutered are seemingly fine and often live longer than their intact counterparts?

Question

Just something that occurred to me when thinking about my elderly cat, who’s spent almost 16 years without her uterus or ovaries to no apparent detriment.

In: Biology

Answer 1

Some are arguing that spaying/neutering actually does have negative health effects. Most of those people are pushing for vasectomy, etc.