Eat The Egg Yolk?! The Truth About Cholesterol
What came first…the chicken or the egg?
That age old question is now surpassed by the highly controversial…
Egg white or egg yolk?
Fat or low fat?
Unless you have been living under a rock, you would be aware that there is much debate in the world of health and nutrition as to whether cholesterol and fat is bad for your health and if it is indeed the cause of heart disease.
I still witness people going to extremes to avoid eating egg yolk like the plague, so much so they would rather purchase egg whites in a carton (ew!) or crack 12 eggs, separate them and ditch the yolks.
And you know what, I get it. With so much conflicting nutrition information out there, its easy to be unsure which health advice to follow.
So to shed some light on the matter…I am cracking the shell on the story (and I promise to make no more eggy puns)
CHOLESTEROL IS NOT BAD FOR YOU.
SATURATED FAT DOESN’T CAUSE HEART DISEASE.
EAT FULL FAT.
EAT THE WHOLE EGG.
There. Article over.
Just kidding of course, by now you should know that I have much more to say that that. That was merely for those of you who only have a 10 second attention span like Homer Simpson (“GASP! That dog has a puffy tail!”)
WHY DO PEOPLE FEAR EGGS AND CHOLESTEROL?
Eggs contain cholesterol. Gasp* There I said it…the C word!
Since the 80’s many have run from any food containing the C word, not to mention any foods that contain even a skerrick of fat. You see, cholesterol and saturated animal fats were incorrectly pinpointed as the cause of heart disease. Due to this error the world responded by avoiding bacon, butter and eggs, replacing them with sugar, cereals, grains and low fat foods and processed oils.
But instead of getting thinner, healthier with less heart disease, we got fatter, sicker and had MORE heart disease.
Before we jump right into it, I want to have a little looksie at what cholesterol is, its role in the body and why it was the victim of a 40 year long witch hunt.
WHAT IS CHOLESTEROL?
Cholesterol is a fat (lipid) found in all animals and is one of the most important constituents of life. Here’s a few reasons why…
- Its vital for brain function and memory – the brain is made up of more than 25% of the body’s cholesterol and forms part of our myelin sheath (kind of a protective tissue around our nerves)
- Its vital for digestion and removing toxins from the body – cholesterol is a raw material for bile acids so that we can absorb fat soluble vitamins A, D, E, K and to aid in ridding the body of waste
- Precursor for our sex hormones – i.e. oestrogen, testosterone
- It forms the membrane of our cells – yep, every single last one of them
- Plays a role an anti-inflammatory action – by preventing omega 6’s converting into the pro-inflammatory pathways
Kind of seems that without cholesterol, we might be in trouble right? Limited brain function, no nutrient assimilation and no sex! Yep…we are all on the fast lane to Shitsville!
Now here’s the thing…
Your body actually makes cholesterol. Everyday you make your own without any input from what you eat. If you don’t produce enough cholesterol, you will take up MORE from your diet (ie eggs). But if you get too much from your diet, you will produce LESS. Its kind of a self regulated process.
Let’s think about that for a moment…for our body to recycle the cholesterol in our body, it must be extremely important in our body otherwise wouldn’t we just get rid of it all and excrete it all as waste? Which takes me back to the role cholesterol plays in the body. Yes…its vital. Check, got that bit.
- Half the people who have heart disease have normal cholesterol
- Half the people with high cholesterol have healthy hearts
- Men with high cholesterol have stronger immune systems than those with low cholesterol
- Low cholesterol has also been linked to depression and anxiety
Cholesterol in the diet
With all of the hullabaloo about lowering cholesterol in your diet, all of the lowering cholesterol margarine’s and don’t eat egg campaigns, its easy to miss the point that diet plays very little part in raising cholesterol for 75% of the population (the other 25% are known as hyper responders).
And while we are onto the egg thing, eating whole eggs actually raises your good cholesterol (HDL) but the LDL particles (thought of as bad) just get bigger and safer.
So if all of this is true then…
What put the wheels in motion that cholesterol was bad in the first place?
Firstly because of a study done on rabbits (who coincidentally are vegetarians) that showed that when rabbits are stuffed full of cholesterol via animal fats, they have a heart attack. I don’t know about you, but I don’t even closely resemble a rabbit in any way shape or form.
Secondly…a man named Ancel Keys did a few more studies that started a shift in thinking that fat was an evil killer. You see, he originally came to the conclusion that cholesterol in the diet doesn’t matter unless you are a rabbit. Great. Thats good for us. Not so good for the poor stuffed little rabbits.
BUT…he didn’t stop there. You see he was hell bent on getting his name in lights, so he was determined to discover that saturated fat caused heart disease. So he put on his horse blinkers and put together another study (The Seven Countries Study) where he looked closely at the fat consumption and heart disease levels of various nations concluding that high cholesterol indirectly caused heart disease through consumption of saturated fat.
Now its important to note that in science correlation isn’t necessarily causation. That is, just because we stuff a rabbit full of A) and B) occurs, it doesn’t necessarily mean that A causes B.
Let me explain that another way…
If we were to assume that A does always cause B, then eating cheese causes people to die by getting tangled in their bed sheets.
See this chart shows that per capita consumption of cheese correlates with the number of people who died by becoming tangled in their bedsheets.
Exactly. A does not always imply B. There are other variables to consider.
Now to be fair, it wasn’t poor Mr Keys who single handedly demonised fat however he certainly played a role in demonising sat fats whilst glorifying polyunsaturated fats (think canola oil). We can touch on them a little later…
But in the end even Mr Keys stated that cholesterol in the diet has “NO SIGNIFICANT EFFECT ON CHOLESTEROL LEVEL OR DEVELOPMENT OF ATHEROSCLEROSIS”.
Still with me?
For those of you who glazed over in that history lesson, here it is in a nutshell…(perhaps you should sit down for this part…)
Cholesterol in the blood isn’t the cause of heart disease or atherosclerosis. In fact, without cholesterol our cells might implode on themselves as every single membrane of every single cell is made up of cholesterol.
Ok, so lets talk more about cholesterol…
WHAT IS HDL AND LDL?
HDL and LDL that we have been labelling as good and bad cholesterol, are actually not cholesterol at all. They are just the transport mechanisms for cholesterol, kind of like a taxi.
High density lipoproteins (HDL) are the taxi’s that carry cholesterol from the body back to the liver and low density lipoproteins (LDL) carry the cholesterol (as well as a bunch of antioxidants and fatty vitamins A, D, E, K) from the liver back out to the body.
There is also LDL-A which you can think of as large, cuddly and buoyant and LDL-B which is smaller, dense and has been indicated as a marker in heart disease.
There is also Lp(a) that carries out a lot of the repairs on cells and arteries and this guy is very small, highly inflammatory and tends to attract the blood clots that can get stuck as they pass by the old damaged artery and plaque build up. Not getting a good ‘please to meet you’ feeling about him now are you?!
WHY DOES LDL GET SUCH A BAD RAP?
When damage occurs to the inside (endothelium) layer of an artery, the LDLs (as well as immune cells) try to create a ‘bandaid’ to fix the issue. They taxi the cholesterol and other good guys that will help treat any damage or injuries to the scene of the crime. If the damage gets fixed and doesn’t continue to get damaged, there really isn’t much of an issue.
But…with repeated damage to the artery in an attempt to contain the situation, it all eventually results in scarring, otherwise known as plaque. Now a heart attack or stroke occurs when the narrowing of the arteries causes the built up plaque (the bandaid trying to repair the damage) to trap blood clots eventually blocking blood flow completely.
Its important to note that LDL doesn’t cause the blockage that leads to the a heart attack or stroke. In fact it was merely doing its job, but they tend to get pinpointed because they are at the scene of the crime. Kind of like blaming the cops at the scene for the crime instead of the crook.
WHAT DOES HIGH LDL MEAN?
If there is “high” LDL in the body, this indicates that there is a greater NEED for cholesterol in the tissues. Remember, its merely a taxi delivering the cholesterol to where it needs to go to help the body to repair cells and dampen inflammation.
However, if your body is running rampant with a heap of omega 6’s also known as arachadonic acid (AA) that we get from vegetable oils, nuts, grains in the body, these guys can easily convert into pro inflammatory lipids that cause an inflammatory pathway.
And guess who inhibits this pro-inflammatory pathway?
Thats’ right, our friend cholesterol. (Does anyone else feel like throwing a ticker tape parade for our friend cholesterol?)
Are you starting to realise that cholesterol ain’t that bad after all?
So what is the real issue here folks? Its the cause of the injury to the artery and the inflammation [light bulb moment!]
WHAT ABOUT SATURATED FAT?
First let me explain what Sat Fats actually are. Fat in food is made up for different types of fats in varying quantities. Fatty foods actually contain all of these fats, just in varying quantities and we tend to categorise that fatty food under the major fat in that food.
Saturated fat (in animal fats such as butter, organ meat and also coconut ), monounsaturated fat (olive oil, avocado) and polyunsaturated fat (seed oils and vegetable oils such a canola oil, safflower oil). About half of our cell membranes are actually made up of sat fat. You see, sat fat is a very stable fat as there are no room in its make up for rancidity or spoilage, whereas a polyunsaturated fatty acids are less stable and are very susceptible to oxidation.
Let me repeat – SFAs are stable, resistant to heat damage, and essential to the body. Polys are easily oxidised and can go rancid.
So what does SFA have to do with cholesterol and heart disease?
Not what you think it does. Saturated fat has no proven associated to heart disease. It’s true that oxidised fat does have a mild association to heart disease, but its not the villain it was once thought.
BUT MY GP SAYS I HAVE HIGH CHOLESTEROL?
When someone is testing your cholesterol, they are actually checking the transporters that carry cholesterol, the HDL and LDL and not the cholesterol itself. You see cholesterol needs the taxis to carry the cholesterol where they need to go in the body.
Now it’s the amount of taxis, not the cholesterol that can cause an issue here.
When people measure cholesterol they look at the LDL and HDL and call one bad and one good. Its not that simple. Remember cholesterol is vital for the body. The problem lies beyond just the picture of HDL and HDL (think oxidation and inflammation).
You need to ask for a bigger picture beyond just the cholesterol.
WHAT TESTS REALLY MATTER?
Total cholesterol or counting the amount of taxis in the blood, does not tell the entire story. Its like reading a random page from a Choose your Own Adventure book and trying to guess the ending.
It’s the particles LDL-A and LDL-B and also the number of Lp(a) that are the most important reading in any cholesterol test. There is also another fabulous marker for inflammation in the body – C reactive protein (CRP).
WHAT CAUSES HEART DISEASE THEN?
I’m glad you asked.
Inflammation and oxidation of the LDL taxis and Lp(a) is the problem. Inflammation causes your arteries to constrict, your heart to pump harder along with oxidation caused by free radicals (which causes further inflammation) and blood clots get caught up in the mess.
So what causes inflammation?
- Low fat diets
- A sedentary lifestyle
- Lack of sleep
- Sleep Apnoea (a condition where you stop breathing in your sleep)
- Free radical damage (where oxidative stress causes havoc and turns cells and the LDLs ugly)
- Thyroid Problems
- High blood pressure
- High blood sugar
- Increased levels of insulin
- Increased levels of homocysteine
- Increased levels of cortisol (stress)
- Lack of vitamin C
- Liver conditions
Let me break it down again for you in one sentence…
Inflammation is the major cause of heart disease.
As your diet fills itself with refined carbs, polyunsaturated and processed foods, sugars and stress and from sitting on your backside typing on a computer with your boss yelling at you, your inflammation rises. So too does the free radicals and the oxidative stress and along with it, inflammation in the body placing those poor little cholesterol taxis at greater risk of being oxidised, drawing in blood clots.
The good news?
90% of all heart disease can be prevented with lifestyle change
THE BOTTOM LINE:
- Cholesterol is needed in the body
- Eating sat fats increases LDL (the large, cuddly, safe kind) and decreases the dense LDL
- Inflammation is the cause of heart disease
- Eat eggs
HOW TO DECREASE INFLAMMATION?
- Eat healthy omega 3 fats such as seafood and fish oil
- Heal your gut flora
- Swap all use of polyunsaturates such as canola or sunflower oil for coconut oil and olive oil
- Replace all margarine for grass-fed butter
- Get a good nights sleep (and treat sleep apnea)
- Avoid a diet of processed food, trans fats and sugar/grains
- Increase intake of vegetables and greens
- Get some exercise
- Eat full fats including butter, lard, coconut, avocado
- Eat the whole egg!
So before you ditch the yolks and order that skinny large mocha latte with one sugar and a Pas de Bouree, consider your levels of inflammation and ask yourself this …
Could I be making a better, more nutritious choice?
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