Yesterday, The Atlantic came out with an article, titled Study: Eggs Are Nearly as Bad for Your Arteries as Cigarettes, that reviewed a recent study comparing eggs to cigarettes. The article concluded that "Egg yolks are almost as bad for your carotid arteries as smoking." Not only is this article misinformed, but I fundamentally believe its logic (and that of the study itself) is flawed.
Here's my take on this. For one, it says the average age of the participants in the study was 62. Do I have the same body as a 62-year-old? No. Therefore, how generalizable are these results to me? It's hard to say..
Ok, yes, egg yolks are high in "cholesterol" as the article posits. But do they realize that there are three different kinds of cholesterol, and not all cholesterol is bad?
Even without breaking down the nutrients in egg yolks, it is still counterintuitive to believe that the whole egg would somehow be unhealthy for you. Why would the yolk exist in a chicken's egg if it was not absolutely essential to a baby chicken's incubation into a chick? Do baby chicks grow by only consuming the egg white? No. The white is where most of the protein from an egg is stored, but not most of the nutrients.
Regardless, it is ludicrous to not eat the egg yolks when eating eggs (just as it is ludicrous to think that, because of what the yolk contains, you should not eat eggs whatsoever). By eating only egg whites, you are neglecting the most nutrient-dense, antioxidant-rich, vitamin-rich, and mineral-rich part of the egg. The yolk contains tons of crucial nutrients, including vitamin A, choline, lutein, B-vitamins, folate, and other trace minerals. These help make eggs one of the healthiest foods in the world.
As you should know, egg whites are great sources of protein. But this protein is not as effective without the yolk to balance out the amino acid profile, making the protein more bio-available. In an egg, the yolk contains all of the fat-soluble vitamins A, D, E, and K in the egg, as well as all of its essential fatty acids. The yolk also holds more than 90% of the calcium, iron, phosphorus, zinc, thiamin, B6, folate, B12, and panthothenic acid of an egg. If the eggs are from free-range chickens, they'll also be full of super healthy omega-3 fatty acids.
The argument that eating the yolk will boost your cholesterol to unhealthy levels is flawed. First of all, when you consume something with high dietary cholesterol, such as eggs, your body down-regulates its internal production of cholesterol to balance out (Conversely, if you don't get enough dietary cholesterol in your diet, your body just produces more, as cholesterol has several vital functions in your body). Second, studies have shown that eating whole eggs raises your HDL "good" cholesterol to a higher degree than LDL "bad" cholesterol, which improves your overall nutrient ratio. Finally, it is important to note that high cholesterol is not even a disease. Heart disease is a disease, to be sure, but not high cholesterol. Cholesterol is a vital substance in your body with several important functions.
I could tell you more about cholesterol and heart disease, but I think my point is clear...time for me to go cook some eggs!