Demonizing eggs seems to occur on a regular cycle. So what is the deal with eggs and are egg yolks bad for people?
To answer this question lets take a look at cholesterol
since it is the bad actor that everyone tends to blame for blocking arteries
and causing heart attacks and stroke.
Almost all of the cholesterol in your body is made by your liver, and in
fact the most popular cholesterol lowering medications work by decreasing your
body’s production of cholesterol in the liver.
Even if you eat NO cholesterol your body will make it because you
cannot survive without it! In
addition, for most people your dietary intake of cholesterol has little to no
effect on your circulating levels of cholesterol, and this includes egg
yolks!
As
previously reported by NPR:
“[E]ating
cholesterol can raise levels of it in the blood, but, as a growing body of research
has shown, not by that much. Consuming sugar, trans fats or excessive saturated
fat (from unhealthy sources) can be more harmful to cholesterol levels than
dietary cholesterol itself.
Most of
the cholesterol in our bodies we make ourselves in the liver, and total body
levels are heavily influenced by genetics, gender and age. As more and more
research suggests that some degree of cholesterol consumption is harmless, if
not healthy, the egg's reputation is gradually returning.”
In 2015,
dietary cholesterol (and egg restriction) was finally eliminated from the U.S. dietary guidelines, and the controversy appeared to have
settled. However, there always seems to be another study urging people to avoid eggs, linking egg
consumption and dietary cholesterol to an increased risk of cardiovascular
disease and death.”
An Example of a Flawed Egg Study
A study, published in the journal JAMA on March 19, 2019, analyzed data from
29,615 American adults pooled from six prospective cohort studies with a median
follow-up of 17.5 years, and claims to have found a dose-dependent relationship
between egg consumption and cardiovascular disease (CVD) and all-cause
mortality.
According
to lead researcher Wenze Zhong, Ph.D., the results suggest there’s no safe
amount of egg consumption, and the team believes the results should be taken
into consideration when the U.S. dietary guidelines are updated.
Big Problems
with this Egg Study
A careful
review shows that are the multiple major flaws in this study.
According
to Stuart Phillips, Ph.D., director of
the McMaster Centre for Nutrition, Exercise, and Health Research -- the amount
of risk, that is reported in the study is trivial because the actual change in
risk is insignificant. For example they
quote a relative risk increase which is very deceiving. The study quotes a relative risk increase
of 17%. However, the absolute risk
(which is all that counts!) paints a very different picture and equates to 17
versus 15 coronary events (2 events total) per 1,000 person years. Needless to say this difference is
meaningless.
It is
also important to note that their data is based on individual’s memory of what they
ate which has been proven over and over again to be very inaccurate.
Andrew
Mente, Ph.D., principal investigator for the Epidemiology Program at the
Population Health Research Institute, pointed out another problem with the data
from this study:
“The
primary hypothesis here is that eggs increase your bad cholesterol, and the
more you eat, the worse it gets. But buried way down in the appendix is a note
that they found higher egg intake is related to a reduction in LDL, your bad
cholesterol. So, what’s driving the association in this research? It seems like
there’s a contradiction with the findings.”
Several
Studies Have Confirmed Eggs Are Good for Your Heart
There
have been several large meta-analyses that have completely refuted the claim that
egg consumption raises your risk for CVD.
Choline - A Critical Nutrient Found in Egg Yolks
Another common misconception is that egg yolks are bad. In fact, the yolks contain all the micronutrients (egg whites are an outstanding source of highly bioavailable protein but almost no micronutrients).
In addition to cholesterol egg yolks contain several key micronutrients. For example, yolks contain vitamins A, D, E and K along with omega-3 fatty acids. Egg yolks also contain more beneficial folate and vitamin B12. The yolks also contain far more of the nutrient choline than the whites, and all of the antioxidants lutein and zeaxanthin which are critical for eye health.
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