Monitor your bowel movements for constipation
It's a huge problem with young people making decisions when peer pressure and family history come to mind. First when people are peer pressured some of the decisions they can make can become a terrible problem addiction. Second for family history if your past events in your decisions it can be great or can make problems. So, those two things can affect your decisions for better or worse.
Here's paragraph hope it helps
The immune system, I'm pretty sure.