Are eggs good or bad, or even evil, is a question that has bedevilled nutritional scientists for decades; one week they are in, the next out.
So what is the latest research having to say? Are eggs good or bad?
And what is a 'proper egg'? Can you spot which one of these stands out in the crowd?
The white is the non-controversial part when trying to answer the question are eggs good or bad; universally scientists agree that it is an excellent food, containing all nine of the essential amino acids.
In that sense it is a complete protein and in theory one could survive with no other sources of amino acids.
Of course in the natural state, all eggs would be fertilized; the function of the white is to provide protein for the growing embryo that is the yolk.
It is in fact mostly water in which these amino acids are dissolved; the white contains nearly two-thirds of the total protein in the egg.
It contains about 3.6 g of protein. Roughly a child requires about 30 g per day, and an adult 50 g.
So, an egg white alone contains about one tenth of our daily protein needs.
And a whole egg would provide about a fifth.
The yolk is the controversial part when investigating whether eggs are good or bad; it is where the fat is found and a large part is cholesterol.
Previously when too much dietary cholesterol was thought to be the cause of heart disease, medicine recommended we eat little or no eggs.
Now the heart foundation recommends an egg a day. Why is that? The cholesterol from your food has little influence on the circulating lipoproteins in the blood in the vast majority of people. Most of it is synthesized in the liver.
While intense debate continues in attempting to answer the question whether eggs are good or bad, it is now considered that refined carbohydrate is the chief cause of heart disease, by raising blood glucose and causing obesity, which in turn inflames the arteries.
The yolk contains the fertilized embryo, supplying the vitamins and minerals, all the fat and about a third of the protein in the egg.
Of particular interest to the chiropractor is the fact that half the fat in the egg yolk is oleic acid, that which forms the myelin sheath around a nerve, without which it cannot conduct impulses.
You may have heard of de-myelinating diseases, like multiple sclerosis.
So far there is no controversy; all is good. However, nearly a third of the fat in the egg yolk is saturated; that is what has bedevilled scientists for decades. Previously it was thought to cause heart disease.
As an aside, the yellow colour in an egg yolk comes from two very important phytochemicals for the eyes; lutein and zeaxanthin.
The egg yolk is also one of the few sources of vitamin B12; a deficiency causes a terminal disease called pernicious anemia; they are undeniably important for our well-being.
Whilst raised blood LDL certainly does contribute to plaque that lines and may narrow our arteries, researchers now conclude that the saturated fats which we eat in butter and eggs, for example, has little influence on the circulating cholesterol.
So whilst eggs were frowned upon for decades, not good but thoroughly bad, now they are back, and in fact recommended. They should never have been sent to Coventry.
Butter is back and so are eggs.
It is the inflammatory substances in the blood that damage the lining of arteries; thereafter the plaque is laid down, and may rupture forming a clot. Raised blood sugar and the pernicious chemicals in cigarette smoke are the chief villains of the peace, not cholesterol.
Are eggs good or bad is a question that at least in part has been finally answered; it depends on what you eat them with.
New research published on the JAMA network1, associations of dietary cholesterol or egg consumption with incident cardiovascular disease and mortality, found that there was a small 3-4% increased risk.
But what's really interesting is this statement by the authors: the associations between dietary cholesterol consumption and incident CVD were no longer significant after adjusting for consumption... of unprocessed red meat, and processed meat.
In short you can have your egg and eat it, provided you don't also have rashers of bacon and sausage too.
in another 2019 study, just to add more confusion, researchers
reporting in the journal Circulation, after following 400 000 people for
13 years concluded that
the risk for ischemic heart disease was positively associated with consumption of red and processed meat and inversely associated with consumption of yogurt, cheese, and eggs...2
An inverse relationship means that the more yogurt, cheese and eggs you ate, the less likelihood you are of having heart disease. Again, it's the red meat eaten with your eggs that is the problem, not the eggs per se.
So, even scientists are not totally sure, whether eggs are good or bad. The weight of evidence suggests that as part of a wholesome meal they come highly recommended.
So, fried eggs on white toast, with rashers of bacon and sausage, with a pancake or scone and strawberry jam on the side that is the problem.
So too, in cakes baked using refined flour are cause for concern; are eggs good or bad?
Enjoyed as eggs Florentine on wholewheat toast you need have no concerns.
Proper eggs are those which are both fertilised and organic; in effect those that would come from a hen in the wild.
There is a simply vast difference when it comes to comparing free range eggs and with those from a hen that has spent its whole life in a tiny wire cage.
Despite the rumours to date I can find no research showing that there are sound reasons for paying more for fertilised eggs; I suspect it's not an urban myth but have no grounds for claiming it.
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