To be completely honest the answer lies in faith. I have faith that wearing my seat belt will reduce my risk of injury because studies prove it does. I have faith that taking certain supplements will reduce my risk of disease because studies prove they do. I have faith that aerobic exercise will reduce my risk of disease because studies prove it does. You see how this goes. If our health is important enough to us (and for some people it is not) and we have scientific proof of the benefits of this or that, then we decide to incorporate this or that into our life because we have faith that it will help to improve our health in the future, to prevent disease, to decrease our reliance upon medicine, and to improve the quality and quantity of our future lives. This is faith in the science.
One of the most important factors in disease and aging is DNA damage or mutation. There are chemicals that our bodies make and that we breathe, eat and drink that cause mutation. These mutations then accelerate aging and cause diseases of all kinds, including cancer. One of the most studied blood markers or chemicals of the ability to prevent and repair mutation is a chemical called thiol. It is called your first-line antioxidant. The more thiol you have the better. A 2005 study done in part by the Department of Cell and Molecular Biology of Tumor Immunology in Sweden found that long-term chiropractic care (2years and up) increases thiol to significantly higher levels than control subjects that do not get chiropractic care, regardless of diet and supplement usage. This study, combined with a previous study solidify that correcting subluxation on the long-term can have a profound effect on your future health. This is wellness care.
So like with vitamins, diet, and exercise, my faith in the science mandates that I get adjusted regularly throughout my lifetime. Quantity and quality of life count.