If only we could prevent disease, we would do so much for the health of the public. We would spare so many from suffering and from death before their time. As a bonus, we could forego the effort and expense of treating avoidable diseases.
Such is the dream of every person, physician and politician who has ever lived. And for every person, physician and politician living in the United States today, this dream is within our grasp. We have a science that points the way.
It is tragic that this science is not at the forefront of the nation's health agenda. Rather we are offered an approach to prevention that will not and cannot spare us from avoidable suffering or premature death. We are about to pay dearly for a public health mistake.
We live in a risky world. The sands under our financial institutions and international alliances are shifting more than ever. We have limited influence beyond our vote, and certainly no control. But we are told repeatedly and stridently that we can control our health risks by avoiding health-adverse behaviors and by attending to disease early on, before we have symptoms.
Some sage advice: We should never start smoking. We need to wear seatbelts when we drive and never drive inebriated or exhausted. We need to submit to rational immunization programs. And we need to practice safe sexual behavior.
This is all obvious. Some advice is not so straightforward. The need for a screening colonoscopy engenders debate that relates to the age at which one should submit and whether a repeat study is valuable. The need for a screening mammography is debated because the test performs very, very poorly. The need for screening PSA is also hotly debated not just because the test performs poorly, but one needs to closely consider whether the exceedingly slight reduction in risk of death from prostate cancer is worth the considerable likelihood of grief from the procedures necessary to reduce that risk.
But most of the advice requires a leap of faith over logic. We are told we need to do some things to reduce risks which present very little hazard to our well being and longevity. Furthermore, we are told we need reduce these small risks despite a science that says no meaningful benefit will result: We need to be lean and fit with normal blood pressures, blood lipids and blood sugars. We need to conform to the latest version of dietary advice. We need to walk stairs. We need to swallow pills to pummel surrogate risk factors such as blood cholesterol or blood sugar. We need to measure bone mineral density to treat osteoporosis early on. And our next episode of back, neck, knee or shoulder pain is the forerunner of catastrophe unless we fix something.
Truth be told, there is no important risk to being chunky, only to being obese (BMI>30). At most a high cholesterol level puts a year or two of longevity at risk; for nearly all of us it's a matter of months and there is no evidence that taking pills or eating differently will improve the odds.
Type II diabetes is easy to treat with pills that lower blood sugar, but such treatment does much more for the blood sugar than it does for you -- if it does anything good at all.
Treating mild hypertension is barely defensible except with the simplest of agents; restricting salt intake works as well.