Amps worsen constipation.
I remember when I started banging meth everyday, and started eating regularly, and didn't have anywhere comfortable to shit where I could take my time...
My buddy Jerry stopped at a gas station, It had been like two weeks since I'd had a proper BM movement.
I strain and turn purple and experience one of the most painful physical sensations I've ever felt. There were tears, there was blood, I was in a time crunch and worried that my buddy ditched me.
I'm done. I walk out to the truck. I get in between this old tweaker (my junkie/game mentor) and this vampire lookin' pot dealer who I always made fun of more smoking meth. They ask what took so long. I light up a cigarette, take a deep drag, and say "I just took the most painful shit of my entire life".
Jerry explains that this is normal, and the vampire guy judges me with his eyes.
We drive off, do shots, commit crimes, make money.
The moral of the story?
There is none, I just felt like sharing it and it's relevant. Water hungry meth molecules combined with a steady diet of animal crackers and soda pop...
This is all pretty common amongst meth users in my experience and I've never heard of anyone doing meth and having to shit. Which is why I can't see the correlation between craving and bubble guts which are pretty common.
(if i sounded hostile sorry, i just got really passionate about this peculiar phenomenon regarding human waste)