dugdeep said:
I've been meaning to do up a summary of that talk, which I'll try to get to soon (won't be today, though). I'll post it here when it's done.
OK, I just remembered that the Paleo Summit material came with transcripts, so I'll quote the relevant part of Kressers talk here (it's just a quick snip, so I think it should be OK to post).
[quote author=Chris Kresser]
...And in the last ten years, especially, thereʼs been a real movement of people who are challenging [the viewpoint that cholesterol causes heart disease]. And in the Paleo community, that is probably the dominant idea, that cholesterol is not the cause of heart disease, and that thereʼs really not much point in measuring cholesterol because itʼs really not the cause of heart disease, nor is it the cause of other diseases. So why bother?
The problem, I think, is that the pendulum may have swung too far back in the other direction. I get a little nervous sometimes. I donʼt spend a lot of time on other blogs at this point because I just donʼt have the time to do that. But every now and then, someone will forward me a comment that they saw on another blog where somebody came on there and said, “Hey, I just had my cholesterol tested. It was 350 and my doctor is freaking out and wants to put me on a statin. What should I do?”
And then you see a bunch of responses saying, “Donʼt worry about it,” or something to that affect, “because cholesterol is not the cause of heart disease. So donʼt worry about it.” So that makes me, as a clinician, really, really nervous when I see that because although cholesterol itself is not the cause of heart disease, really high cholesterol like that can be indicative of an underlying problem that needs to be addressed. And furthermore, cholesterol can certainly contribute to heart disease risk, especially when it becomes oxidized, which weʼll talk about a little more.
But I wanted to briefly cover a few different problems that high cholesterol can be a marker for. One is leptin resistance. And I know youʼve talked a lot about this, Sean, in your fantastic weight-loss product and in several articles. And weʼve seen a lot of discussion about this in the Paleo sphere. But leptin is basically the master signal that communicates whether or not the body is in a state of abundance. And when the cell needs more cholesterol, or when leptin is signaling to the cell that the body is in a state of abundance, the activity of the LDL receptor ramps up.
So the LDL receptor is the receptor on a cell that takes LDL out of the blood and brings it inside of the cell where the nutrients that it carries, such as the triglycerides and the cholesterol, can perform all of the actions that theyʼre supposed to. But when somebody is leptin resistant, this doesnʼt happen. The LDL receptor activity does not get ramped up, and LDL stays around in the blood which causes high cholesterol. So, leptin resistance is one of the things that high cholesterol can point to.
Number two, thyroid hormone T3 is necessary to activate the LDL receptor. So if somebody is hypothyroid - theyʼve got Hashimotoʼs or iodine deficiency or some other cause of hypothyroidism - then you can see high cholesterol just from that alone. Leptin resistance, by the way, can contribute to hypothyroidism because leptin is kind of the master control hormone. So, if somebody has high cholesterol, I definitely recommend that they get their thyroid checked for that reason.
Another cause of high cholesterol is infection. So, we know now that LDL and HDL play important roles in the immune system. And LDL levels rise with infection. And a recent study that Mat Lalonde sent to me actually found that in mice with a defect in the LDL receptor - which means that they end up having very high levels of LDL cholesterol - they are protected against gram-negative bacterial infections and the endotoxemia that results from those infections. So that clearly shows that LDL is playing a pretty important role in protecting against infectious disease.
Another potential cause of high cholesterol is inflammation. Studies have shown that LDL rises after dental surgery, for example. So when you have some tissue damage, LDL is a repair substance. You can think of it a little bit like spackling. If you were to punch a hole in the wall, youʼve got to fill it up with spackling. So, LDL will rise when thereʼs some tissue damage.
Another potential cause is micronutrient deficiency. Iron and copper deficiency can cause dyslipidemia, elevations in cholesterol. Also, iodine deficiency can contribute to that via hypothyroidism, as I just mentioned.
And then, last but not least - because this is actually a fairly common issue in North America - is a genetic mutation called familial hypercholesterolemia where one of the genes that codes for the LDL receptor doesnʼt function well. Or it doesnʼt function at all. So what happens here is that people have usually very high cholesterol levels. Their total cholesterol will be something around 300-500 and up, and their LDL cholesterol will be pretty high, but their HDL will be normal, and their triglycerides will be normal. And these folks do, in fact, experience an increased risk of death from all causes and death from heart disease. And there are particular things that need to be done, I think, if somebody has familial hypercholesterolemia. And I donʼt think itʼs wise to just ignore it and write it off and say, “Well, cholesterol is not the cause of heart disease.”
So, as you can see, thereʼs a number of possible things going on when you have an elevated cholesterol level. And I think the best approach if you have high cholesterol is to investigate all of those various mechanisms and try to rule them out or address them if theyʼre present rather than just ignoring it.[/quote]
Quick note for webglider: coconut oil (or MCT oil) increases the amount of ketones in the blood, even if you're not in ketosis and can be very helpful with the transition. If you tolerate it, you might want to start adding lots of it to your diet, at least until your body gets into fat burning mode. This has been given as advice by both Mark Sisson and Paul Jamminet, I believe, as ways of avoiding or minimizing "low carb flu".