That’s a conclusion of Jason Vassy’s piece
in “Personalized Medicine” that came up recently on a Medscape alert. He was
referring to the outcome of two recent trials that examined whether genotype
information was helpful in motivating health behavior changes in a population
that was genetically susceptible to Type 2 diabetes. It was “hoped” that
knowledge of one’s genetic susceptibility might be a “clinically useful tool”
in targeting “primary prevention strategies before the onset of certain
diseases.” Sadly, he concluded that “At present, however, genetic testing for
T2D risk likely does not improve preventive health behaviors in today’s
diabetogenic environment.” Quelle
surprise!
If you are interested in genetic testing for Type 2 diabetes
susceptibility, however, there were some tidbits to glean from this article, to
wit: “At least 65 genetic loci contribute to T2D risk. Of these, rs790316 in
the TCF7L2 gene is associated with
the greatest risk: each copy of the T allele carries an odds ratio for T2D of
1.39. The effect sizes of most other T2D loci are generally much smaller (odds
ratios typically ranging from 1.05 to 1.15).” This is, of course, all “Greek”
to me, but it is worth noting that some people argue that you should ignore
almost any study with an odds ratio under 2.
Vassy hastens to point out, though, that “This (greater
susceptibility to T2D risk) contrasts with the much larger effect-sizes of
family history: T2D in one or both parents multiplies one’s risk by up to two- and
six-fold, respectively.” He does not point out, though, that the association with family history goes far
beyond genetics or ethnicity; it includes
diet, economics, cultural practices, and many other environmental factors generally
too complex to reliably isolate in even large epidemiological studies.
Alas, he finally concludes, “Genotype risk scores that combine multiple
T2D-associated loci significantly predict the future risk of T2D, but they may
not improve traditional T2D prediction models consisting of routine risk
factors such as family history, BMI, and fasting glucose.”
Behavior change, however, was the hoped-for outcome of these
two studies and this author’s commentary. They were all disappointed but, I
suspect, not surprised. The medical establishment has come to expect failure.
Vassy expresses that outcome succinctly: “These results will not surprise
clinicians, whose efforts at counseling patients for weight loss and
improvement in diet and exercise habits often fail.” The implication is it’s
the patient’s fault. The patient is deemed “non-compliant” with the
“prescription” because, they say empathetically “behavior change is incredibly
difficult.”
It never seems to occur to the practitioner that that expected
outcome failed to materialize because it was a failed protocol – the wrong prescription to treat
the cause of the syndrome (see #9, "Metabolic
Syndrome," here for the indications), of which obesity is merely a
symptom, not the cause. A large percentage of the world’s peoples are apparently
genetically predisposed and therefore susceptible to this scourge. It is the outcome of eating a Westernized
diet. We become fat not because we eat too much fat and cholesterol (and
are too sedentary), but because we (who are susceptible) eat too many sugars
and processed carbohydrates. Our metabolism becomes deranged (“disregulated”) –
in other words “broken.” We make and store fat as a consequence of eating
sugars, processed carbs and fat. The
body uses the sugars and processed carbs for energy and stores the fat for the
inevitable famine that it is designed to expect and be prepared for. The
trouble is the famine never comes. We live in a world with an overabundance of relatively
cheap carbohydrates in the form of manufactured and processed foods. This is in
contrast to the animal-based dietary of protein and fat, plus seasonal whole
foods (including unprocessed carbohydrates) our ancestors ate. Instead, we now
graze on processed carbohydrates all day long as though we lived in a veritable
corn-utopia©, which, in fact, we do.
Our body is an exquisitely designed system that works
flawlessly until or unless we mess with it. Even then, it works against even our best efforts to subvert
its protective mechanisms. It will until it “breaks” or unless we learn how to
work with it. If we eat Low Carb or Very Low Carb, and just two or three small
meals a day of moderate protein/high fat over an 8 or 10 hour period, and then
fast for 16 or 14 hours, we will be living much the way our ancestors did. The
outcomes of this Way of Eating are weight loss for most, high energy levels,
improved health markers (even before weight loss), well being, and longevity.
This “prescription” doesn’t occur to our health
care providers. Their “hopes” are still pinned on weight loss, and their
protocol is still a balanced diet, with less saturated fat and dietary
cholesterol, and more exercise. That this bias is assumed and built into the
two studies and the commentary of Vassy’s piece is self-evident: “Overall,
participants did not change their dietary fat intake or exercise habits over
the study period, although most already had ‘good’ habits at baseline.” Then,
“However, receiving a higher genetic risk estimate for obesity was associated
with greater fat intake and lower exercise scores…” Thus, these changes in diet
and energy expenditure, the universally prescribed standard lifestyle modification
program, did not work to reduce T2D risk. Behavior change is incredibly
difficult, when it is the wrong lifestyle modification. The right one, VLC, is simple. Outcome: Weight
loss and improved health,
without hunger.