Body
Your body is your vessel in this life, not caring for it will lead to the breakdown of the mind and soul, it's all interconnected and cannot be ignored. How do we care for our body? Food is one way, what you eat directly affects your health, how can we better fuel ourselves? Put junk in your body & it will eventually breakdown, just like our cars, put the lower grade gasoline in an engine designed for premium and watch how the performance diminishes.
Exercise is another critical compenent to keeping the whole system working properly. Same analogy as the car, if you keep it covered and never start it or drive it around, it will eventually stop working.
These aren't complicated concepts and a few changes could provide you with an amazingly positive response from your body.
Full disclosure: I am not a doctor, nutritionist, or personal trainer, just someone who studies these topics and have implemented the information in my life with much success. I take no medicine and am quite healthy for a old gal (Thank God for that!). These are my opinions, I invite you to consider what you learn here and do your own research, speak with a professional if you'd like and see if you don't think these suggestions will help!