Before I can really begin to talk about health and personal evolution I think it's important to define some key terms. Some of these definitions are slightly different than the orthodox cannon but I invite you to consider what your own previous definition is or was, how it differs and what the possible ramifications are.
Health is defined as functional balance in a system, there are only two possibilities, increasing health or decreasing health. Anything that encourages a status quo in a dynamic system such as a human being is effectively reducing health due to the ever changing nature of the system. Thus, every single thing we eat, drink, breathe, say, do, feel or think falls into one of these two categories. Nature ALWAYS tends to increase in organization. As a system is outgrown it breaks "down" and naturally reforms into a higher level of organization. Much like what is happening in the world on a grand scale these days. Thus, health is by it's very nature always increasing.
Toxins are anything that does not promote an increased level of organization, this includes that which promotes an apparent status quo. Nature is ALWAYS expanding and anything that does not support this is damage to the system.
Common Toxins include:
Environmental, Food, Relationships, Workplace - pesticides, exhaust gasses, radiation, negative or co-dependent relationships, undigestible food additives, drug residues, parasitic financial lending practices etc etc etc.
Medicine is that which we use to adjust the system to promote health. Simply put, anything we take, say, use or think to improve the "System's" level of organization, everything can be medicine in some way or other and if it's not, it's a toxin. Everything counts. Everything.
Cleansing is the process of removing toxins from our system to promote health.
Our "System" is defined as that which immediately supports our existence. The most obvious part of this is of course the body and all it's subsystems including the endocrine system, skeletal system, muscular system, nervous system etc; less obvious parts are the relationships that support us such as our families, spouses and close friends or the environment - the air, food and water required to keep us alive or the financial and social system that allows us to function in society, own property, go to museums or play poker. You can see now that with this slightly broader perspective on what constitutes "Our System" we become highly interdependent creatures, not just with each other, but if our actions also effect every other aspect of the overall system then we are universally interdependent. Reducing the perspective of "Us" to a smaller scale for personal convenience or profit is neither useful nor accurate.
Things in the world are changing rapidly and fundamentally, we are now entering a new golden age of sanity, a more balanced and rational way of living than the separation, greed and violence that characterized our previous age, the one I fondly refer to as the B.S. Age (Before Sanity). The B.S. way of defining "Our System" as ending at the skin clearly was inadequate as is evidenced by the rampant chronic disease, global inability to provide effective health care and the fact that most of the systems on the planet (financial, food production political etc) are now breaking down. When it becomes fiscally responsible for a major corporation to be poisoning much of the world's food supply with toxic food additives and pesticides as a primary corporate goal then we clearly have a serious issue with our paradigm. (do a quick web search on the Monsanto corporation, it's fun)
Looking at "Our System" as a web interdependent with all others and therefore responsible in part for the health of the overall global system is a model substantially more comprehensive and allows us to make a fundamental shift in perspective that aligns us with nature and more importantly each other rather than creating the historically adversarial environment that is proving so detrimental to the well being of the earth and every living thing on it. Not only is it more functional, it is more efficient. With each aspect of the system working toward the health of the whole, nothing is wasted in warfare or corporate bonuses for failing financial institutions. Whether you think of it as pay it forward, manifestation, global oneness or simple personal responsibility, it all leads to the same perspective and essential course of action.
It's very simple, that which supports us does not end at our skin and supporting that which supports us in turn supports the world. Anything else causes harm.
Even shorter: The world supports that which supports it.
Which one are you?