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The Cholesterol Myths

Питер Аттиа о холестерине (статья в 6 частях)

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The straight dope on cholesterol – Part I

http://www.docsopinion.com/2014/07/17/t ... hdl-ratio/

The Triglyceride/HDL Cholesterol Ratio

[+] Открыть спойлер: The Triglyceride/HDL Cholesterol Ratio
July 17, 2014 By Axel F. Sigurdsson MD 96 Comments

What Is Non-HDL Cholesterol?
For years, measurements of blood cholesterol have been used to assess the risk of heart disease.

We have been intensively educated about the role of LDL-cholesterol (LDL-C), commonly nicknamed the bad cholesterol and HDL-cholesterol (HDL-C), often called the good cholesterol.

For many different reasons, lowering LDL-C has become a primary goal in cardiovascular prevention. There is strong evidence available suggesting a relationship between LDL-C and the risk of coronary heart disease.

Medical professionals usually recommend lifestyle measures that lower LDL-C, and statins (cholesterol-lowering drugs) are used by millions of people worldwide for the sole purpose of lowering LDL-C numbers.

However, to understand coronary heart disease and how plaques form in our arteries (atherosclerosis) we have to understand that focusing only on cholesterol is an oversimplification.

Because cholesterol is a fat substance, it can’t mix with water and can therefore not travel in blood on its own. The body’s solution to this problem is to bind fat molecules to lipoproteins that function as transport vehicles carrying different types of fats such as cholesterol, triglycerides (TG) and phospholipids.

It is important to understand that it is lipoprotein that interact with the arterial wall and initiate the development of atherosclerosis. Cholesterol is only one of many components of lipoproteins.

The Lipid Panel

A standard lipid panel includes total cholesterol, LDL-C, HDL-C, and TG. Although LDL-C usually gets the bulk of the attention, evidence suggests that other aspects of the lipid profile may not be less important. For example, non-HDL Cholesterol is a strong marker of risk, maybe more important than LDL-C.

Relying on LDL-C alone can be misleading. For example, people with obesity, metabolic syndrome or diabetic lipid disorders often have raised TG, low HDL-C and normal or close to normal LDL-C. These individuals produce very low-density lipoproteins (VLDL) and intermediate-density lipoproteins (IDL) which may increase the risk of atherosclerosis.

Many studies have found that the triglyceride/HDL cholesterol ratio (TG/HDL-C ratio) correlates strongly with the incidence and extent of coronary artery disease. This relationship is true both for men and women.

One study found that a TG/HDL-C ratio above 4 was the most powerful independent predictor of developing coronary artery disease.

With the increasing prevalence of overweight, obesity, and the metabolic syndrome this ratio may become even more important because high TG and low HDL-C is often associated with these disorders.

The Triglyceride/HDL Cholesterol Ratio. What Is Ideal?

The TG/HDL-C ratio can easily be calculated from the standard lipid profile. Just divide your TG by your HDL-C.

However, when looking at the ideal ratio you have to check if your lipid values are provided in mg/dl like in the US or mmol/L like in Australia, Canada and most European countries.

If lipid values are expressed as mg/dl (like in the US);

TG/HDL-C ratio less than 2 is ideal

TG/HDL-C ratio above 4 is too high

TG/HDL-C ratio above 6 is much too high

If you live outside the US or are using mmol/L, you have to multiply this ratio by 0.4366 to attain the correct reference values. You can also multiply your ratio by 2.3 and use the reference values above.

If lipid values are expressed as mmol/L (like in Australia, Canada and Europe);

TG/HDL-C ratio less than 0.87 is ideal

TG/HDL-C ratio above 1.74 is too high

TG/HDL-C ratio above 2.62 is much too high

In this article, TG/HDL-C ratio is provided as in the US (mg/dl).

Triglyceride/HDL Cholesterol Ratio and LDL Particles?

Recently, analyzing the number of LDL particles (LDL-P) and LDL particle size has become increasingly common. However, this method is not universally available, is expensive, and has not been widely applied in clinical practice.

High numbers of small, dense LDL particles are associated with increased risk for coronary heart disease in prospective epidemiologic studies. Subjects with small, dense particles (phenotype B) are at higher risk than those with larger, more buoyant LDL particles (phenotype A).

Interestingly, it has been found that the TG/HDL-C ratio can predict particle size. One study found that 79% of individuals with a ratio above 3.8 had a preponderance of small dense LDL particles, whereas 81% of those with a ratio below 3.8 had a preponderance of large buoyant particles.

Obviously, people with high TG/HDL-C ratio tend to have higher than normal TG. Just like all other lipids, TG have to be transported in the blood by lipoproteins, most are carried by chylomicrons and VLDL.

What happens under these circumstances is an interchange of lipids between lipoproteins. TG are moved from VLDL into LDL and HDL in exchange for cholesteryl ester. The result is that LDL and HDL particles become cholesterol poor and rich in TG. Then, when TG are removed from these particles, which usually is the case, the particles shrink and become smaller as they’re only transporting small amounts of cholesterol. This explains the relationship between high TG/HDL-C ratio and the number of small LDL particles.

However, the number of LDL particles present in the blood may be more important than particle size. Furthermore, particle number appears more important than how much cholesterol is carried within these particles. Blood levels of LDL-P and apolipoprotein B are strongly correlated with the risk of coronary heart disease. Both these measurements reflect the actual number of LDL-particles.

But, can the TG/HDL-C ratio reflect particle number? In fact it can, to a certain degree. Take a look at the LDL-C, the amount of cholesterol carried in LDL-particles. A high TG/HDL-C ratio indicates that these particles are small. A small particle carries less cholesterol than a large particle. Therefore, a larger number of particles is needed to carry a certain amount of cholesterol if the particles are small than if they’re large. So, a high TG/HDL-C ratio likely reflects a high number of LDL-particles, unless LDL-C is very low.

Triglyceride/HDL Cholesterol Ratio and Insulin Resistance

Insulin resistance is a condition in which cells fail to respond to the normal actions of insulin. Most people with this condition have high levels of insulin in their blood. Insulin resistance appears to play an important role in coronary heart disease, and can predict mortality. This condition is common among individuals with abdominal obesity and the metabolic syndrome.

A study in which most of the participants were Caucasian and overweight identified TG/HDL-C ratio of 3 or greater as a reliable predictor of insulin resistance.

However, not all studies have found the TG/HDL-C ratio to be associated with insulin resistance. For example, in a relatively small study of 125 African American participants, neither fasting TG nor the TG/HDL-C ratio was shown to be a marker of insulin resistance.

Although confirmatory studies are needed, data suggests that an elevated TG/HDL-C ratio may be clinically useful for the prediction of insulin resistance.

How to Improve Your Triglyceride/HDL Cholesterol Ratio

Improving your TG/HDL ratio aims at lowering TG, raising HDL-C or preferably both.

If you are overweight, losing weight will probably lower your TG levels and so will reducing your intake of added sugar. Studies have found that high intake of fructose leads to high TG. High-fructose corn syrup is a major source of fructose.

Low-fat diets are usually not effective in lowering TG. In fact, low-fat, high-carbohydrate diets may raise TG. Adding omega-3 fatty acids, regular exercise and limiting alcohol may be helpful to lower TG.

Similar methods may be useful for raising HDL-C. Losing weight, exercising and not smoking may help. In controlled trials, low-fat, high-carbohydrate diets decrease HDL-C, thereby raising the TG/HDL ratio.

In 1961, a group of investigators from the Rockefeller Institute, led by Pete Ahrens published a paper entitled “Carbohydrate-induced and fat-induced lipemia”.

The authors pointed out that fat-induced increase in TG following a meal is a postprandial phenomenon (we all have high TG for a few hours following a fatty meal) caused by chylomicrons is different from the carbohydrate-induced rise in TG (later found to be caused by elevation of VLDL).

These findings have been confirmed in several more recent studies. Despite this, low fat, high carbohydrate diets are still being recommended as a primary option to reduce the risk of heart disease.

Although low-fat diets may help lowering LDL-C, low carbohydrate diets are more effective in improving the TG/HDL-C ratio.

This suggests that solely selecting LDL-C as a target in cardiovascular prevention is an oversimplification, and may have lead to wrong conclusions regarding the relationship between diet and heart disease.

What to do if a Low-Carb Diet Raises Your Cholesterol

https://authoritynutrition.com/low-carb ... olesterol/

Low-carb and ketogenic diets are incredibly healthy.

They have clear, potentially life-saving benefits for some of the world’s most serious diseases.

This includes obesity, type 2 diabetes, metabolic syndrome, epilepsy and numerous others.

The most common heart disease risk factors tend to improve greatly, for most people (1, 2, 3).

According to these improvements, low-carb diets should reduce the risk of heart disease.

But even if these risk factors improve on average, there can be individuals within those averages that experience improvements, and others who see negative effects.

There appears to be a small subset of people who experience increased cholesterol levels on a low-carb diet, especially a ketogenic diet or a very high fat version of paleo.

This includes increases in Total and LDL cholesterol… as well as increases in advanced (and much more important) markers like LDL particle number.

Of course, most of these “risk factors” were established in the context of a high-carb, high-calorie Western diet and we don’t know if they have the same effects on a healthy low-carb diet that reduces inflammation and oxidative stress.

However… it is better to be safe than sorry and I think that these individuals should take some measures to get their levels down, especially those who have a family history of heart disease.

Fortunately, you don’t need to go on a low-fat diet, eat veggie oils or take statins to get your levels down.

Some simple adjustments will do just fine and you will still be able to reap all the metabolic benefits of eating low-carb.

Книга онлайн: Холестериновые мифы.

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Супер-супер!! Vala_14 Кладезь материала по холестериновой теме.

Блог Дэвида Эванса, в котром собрано более 1500 научных исследований (с краткими сводками), а также книги по теме влияния холестерина, насыщенных жиров и статинов на здоровье.

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Если вы знаете кого - нибудь, кто волнуется об их уровнях холестерина и болезни сердца, или им было сказано принимать статины, вы можете отправить им ссылку на этот сайт.

Небольшой отрывочек из его книги:

Цифры, взятые из 192 стран по данным Всемирной организации здравоохранения показывают следующее:

· Женщины с уровнем холестерина 177 мг / дл (4,6 ммоль / л) и при имеют 250% более высокий уровень смертности , чем у женщин с уровнем холестерина 212 мг / дл (5,5 ммоль / л) и более.
· Мужчины с уровнем холестерина 177 мг / дл (4,6 ммоль / л) и при имеют 138% более высокий уровень смертности , чем у мужчин с уровнем холестерина 212 мг / дл (5,5 ммоль / л) и более.

Сайт доктора Малкольма Кендрика

"Проще говоря, если в организме отсутствует воспаление, нет никакого способа для накопления холестерина на стенке кровеносного сосуда. Без воспаления холестерол будет свободно перемещаться по всему телу, как задумано природой. Воспаление заставляет холестерин попасть в ловушку."

Ещё один замечательный блог по теме.

Ведет блог д-р Вернер Уилок, автор книги «Здоровое питание» - самая большая ошибка в истории болезни.

Ещё больше плохих новостей о статинах. Истории болезней.

Читатели этих блогов будут знать, что существует очень мало достоверных доказательств того, что использование статинов для снижения общего холестерина (ТС) и ЛПНП-холестерина (ЛПНП-С) имеет значительные преимущества. Как правило, преимущества использования статинов были преувеличены. В то же время неблагоприятные побочные эффекты (ADE) неизменно преуменьшались. За последние несколько лет я столкнулся с многочисленными людьми, которым были назначены статины. Удивительно было обнаружить, что подавляющее большинство перестали их использовать. Однако некоторым из них не повезло и он получил постоянный ущерб, который может быть абсолютно изнурительным.

Тематика блога не ограничена проблемой холестерина и статинов. Например, затронута моя любимая тема подщёта килокала.

Когда вы едите меньше калорий и / или сжигаете больше с упражнениями, ваш метаболизм, чувствуя, что вы переживаете голод, замедляется, чтобы сберечь энергию. Вы станете более сидячим, температура вашего тела упадет, ваш энергетический уровень снизится, и ваша потеря веса замедлит или остановится.

Код холестерина

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