system
Given the following post, respond as if you're commenting on Reddit:
human
Why can't we communicate with our body?

I realize there are hormones coursing through our veins and electric signals through our nerves constantly but I'm talking about conscious orders like these for example:

"Deactivate pain receptors in such area for an hour!"
or
"Keep blood inside penis and belay ejaculation!"

Better yet, why can't I tell it to burn all this useless excess fat and augment my bone density while I start binging on calcium.

I'm barely scratching the top of the iceberg here. It appears to me that the survival advantages of this would be tremendous. Almost inconceivably so. In theory, one could coach the body into immortality.

The only reason I can think of for this not happening: Achieving control over pleasure centers early on leads to basically orgasming to death while neglecting food and everything else like those rats with the pleasure switches.
gpt
Well, the first reason is that an intelligent, conscious mind appears to be a fairly recent evolutionary development, and so the kind of rewiring of the body that you're talking about might not be possible in evolutionary timescales. But let's forget that, for the moment, and talk about whether there's *really* any evolutionary advantage.

Let's take hunger as an example. Don't eat for a while and you'll start feeling a discomfort that makes you want to go and eat some food -- presumably other animals feel something similar. It's an annoying sort of sensation, so suppose you could "turn it off" when it shows up just like you do with an alarm clock. Ancestral man would, when he started to feel hungry, choose to press "snooze" over and over again instead of going to the trouble of finding some *actual* food, and he'd starve to death.

Likewise with pain. If your conscious mind can overrule the pain, then the pain no longer serves its purpose of telling you that you're damaged... you'll just turn the pain off as soon as you start to feel it.

No, you can't "coach" your body into immortality. How would you do that? 

Really, the short answer is that up until very recently our bodies have been a lot smarter than our conscious minds have. Your body has a pretty damn good idea of how dense to make its bones or whether it's a good idea to walk on a broken leg, whereas a caveman doesn't.