You know the old saying "keep doing the same thing and you'll keep getting the same results"? Well then why do we think we'll feel any better if we never change our eating/sleeping/social habits? It's kind of funny really. People doing the same thing day after day, expecting things to change. Some call this the definition of insanity. We're not really insane, we just don't know any better. And this is how we get on a vicious cycle of reocurring illness we don't know how to get out of.
You know how it goes. You