Wednesday, December 14, 2016

The Post I Never Wanted to Write…but here I am!

A very controversial paper was published 11 years ago in one of our most prestigious medical journals by a group of prominent epidemiologists.  In this thought provoking paper in the New England Journal of Medicine the authors predicted a decline in life expectancy in the United States in this century.  Their words were disturbing, “…the steady rise in life expectancy observed in the modern era may soon come to an end and the youth of today may, on average, live less healthy and possibly shorter lives than their parents”.

These projections were based on the continuing increase in diseases driven mainly by lifestyle factors such as nutrition and exercise.  The most glaring example is the explosion in type 2 diabetes with the percentage of the population with it doubling about every 15 years.  The part of this iceberg not well seen as it is “below the water line” is prediabetes which now affects 1 in 3 U.S. adults and 15% of adolescents.

So back to the part I never wanted to have to post.  The purpose of that controversial paper was to enlighten us about the dead end that lay at the other end of the route through the maze that society was taking with lifestyle.  The enlightenment was, of course, to push our lifestyle route through this maze in another direction. 

Unfortunately, this message got ignored perhaps based on two other misleading messages.  These are that high carb, sugar loaded, chemical laden manufactured diets that the U.S. consumes couldn’t be that bad and that no matter what we do to ourselves, there are drugs and medical procedures that will serve as the wild card to negate the risk.  We now know the message the prominent epidemiologists gave us 11 years ago was accurate and that these other two competing messages are largely untrue.

The National Center for Health Statistics which tracts statistics on most aspects of our nation’s health revealed some sobering data earlier this month.  For the first time since 1993 during the peak of the AIDs epidemic life expectancy in the U.S. declined.  The current youngest children will have a life expectancy less that of the parents and grandparents. 

The primary reasons for the developing decline are the increasing rates of deaths from diseases including:

  • Heart disease
  •  Stroke
  • Diabetes
  • Alzheimer’s disease
  • Kidney disease

These statistics are in spite of ever growing numbers of adults being treated with drugs such as statins which are assumed to be preventing this outcome.  Telling of this disconnect was shown in a study published this year in the Journal of the American Heart Association.  The study looked at the ability of statin treatment to prevent or improve plaque build-up in the carotid artery, a factor that is known to increase the risk of both stroke and heart disease. 

While non-obese subjects had an average plaque reduction of -4.2% after one year of statin treatment, obese subjects had an average +4.8% increase with the same treatment. 

It seems arterial disease is driven by the interaction of several factors not just the levels of LDL cholesterol.  One noticeable associated factor was an inflammatory marker called C-reactive protein (CRP).  Central body fat (belly, waist, hips) generates pronounced inflammation which increases the risk of all 5 diseases mentioned in the list above.  Elevated CRP increased the risk of plaque progression 156% in 1 year.

Before the mind goes to just add an anti-inflammatory drug, a couple of things should be considered.  Their long-term use is associated with substantial increased risk of renal failure which is one of the cited diseases driving the downturn in longevity.  In contrast for every hour of sedentary time replaced by moderate physical activity there is a 24% reduction in the inflammatory marker CRP.

There are many more examples of the inferiority of the treatment of lifestyle driven abnormalities with drugs versus corrective lifestyle.  I talk to several prediabetics each month who are not aware that they have prediabetes in spite of lab studies demonstrating it for a couple of years.  I also talk to diabetics who have been told their blood HA1C levels are good at 7.0% because the medication has lowered it from 9.5%.  The normal range is <5.7% and the increased vascular disease risk at 9.5%, or poorly controlled diabetes, is +130%.  While the risk is lower at an HA1C of 7.0% it is still 40-60% higher than if it was in the normal range.

So why is 6.5%-7.0% which is the upper prediabetic range “good control” with medication? Studies have shown that pushing it lower with that type of treatment will cause episodes of intermittent hypoglycemia and actually increases overall death risk.  The only way to safely improve more in that circumstance is with intense lifestyle management including dietary change, exercise and weight loss.

Another example of how these diseases interrelate was discussed in the scientific section of the European Association for the Study of Diabetes.  Dutch researchers reported their study of brain changes associated both with diabetes and with prediabetes.  The reason for looking at this is that diabetes is a strong risk factor for developing some form of dementia such as Alzheimer’s disease. 

Two imaging findings are associated with the brain changes driving dementia in diabetes.  The first is diminished brain volume which represents actual loss of large numbers of neurons or brain cells.  The second is white matter lesions (WMLs) which represent small areas of damage caused by altered blood flow. 

Diabetics had 167% greater numbers of WMLs than healthy controls.  Most surprisingly, prediabetics demonstrated considerable increased WMLs with 66% more than age comparable healthy adults.
Brain volume reductions showed similar patterns with diabetics having the greatest but prediabetics having abnormal amounts as well.  The structural brain changes associated with eventual dementia are present in prediabetes but just not as advanced as in diabetes.

So the circumstances at the time I wrote newsletter articles about the New England Journal of Medicine paper 11 years ago have changed.  That alarming projection has become an alarming reality.  What is the same is two-fold.  First is the 11-year old projection should serve as a dramatic wake-up call.  The second is the solution remains the same although more urgent.

In the developing years of 20th century healthcare infectious disease was a major cause of death, and it could be effectively treated with a single drug.  That idea has persisted as the main tenent of health care.  The 21st century finds very different challenges, complex multi-system diseases highly related to several interacting lifestyle errors.  These diseases are not well managed with the one disease/one drug approach we have seemed to carry over.  They are also not ideally managed with the common 6-10 drugs that are trying to get at late effects of chronic lifestyle neglect.  We are working only in the right side of first diagram above.  The solution really lies in working predominantly on the left side of it.

Olshansky et al.  A POTENTIAL DECLINE IN LIFE EXPECTANCY IN THE UNITED STATES IN THE 21ST CENTURY.  New England Journal of Medicine, 2007;352:1138-1144.
Falconer et al.  SEDENTARY TIME AND MARKERS OF INFLAMMATION IN PEOPLE WITH NEWLY DIAGNOSED TYPE 2 DIABETES.  Nutrition, Metabolism & Cardiovascular Disease, 2014;24:956-962.

Sullivan MG.  BRAIN ATROPHY IS ALREADY EVIDENT IN PATIENTS WITH PREDIABETES.  Clinical Endocrinology News, Sept 14, 2016.

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