Dr. Mercola Interviews the Experts This article is part of a weekly series in which Dr. Mercola interviews various experts on a variety of health issues. To see more expert interviews, click here. In this interview, Tucker Goodrich and I discuss what will be the topic of my next book, namely linoleic acid (LA), which I believe is likely the leading contributing cause of virtually all chronic diseases we’ve encountered over the last century. Unfortunately, this is a topic that most clinicians and health care practitioners who focus on natural medicine have only a superficial understanding of. Goodrich has a business background as a stockbroker and asset manager, and developed an IT risk management system used by two of the largest hedge funds in the world. A string of health crises in his late 30s and early 40s prompted him to apply his research and troubleshooting skills to medical research. As noted by Goodrich, “It was a very upsetting time in my life and medical professionals really weren't any help at all in trying to figure out what caused things.” After a lot of reading and researching, he decided to cut out seed oils from his diet, and in just two days, his 16-year-long bout with irritable bowel disease started to dramatically improve. “I started immediately feeling better,” he says. He also lost a significant amount of weight over the next two months. After that, he stopped eating carbs and realized he must have had a severe case of gluten intolerance.
Avoiding Omega-6 Fats Is Key for Good HealthWhile considered an essential fat, when consumed in excessive amounts, which over 99% of people do, LA (an omega-6 polyunsaturated fat or PUFA) acts as a metabolic poison. Most clinicians who value nutritional interventions to optimize health understand that vegetable oils, which are loaded with omega-6 PUFAs, are something to be avoided. What most fail to appreciate is that even if you eliminate the vegetable oils and avoid them like the plague, you may still be missing the mark. Chances are you’re still getting too much of this dangerous fat from supposedly healthy food sources such as olive oil and chicken (which are fed LA-rich grains) — a topic covered in “Why Chicken Is Killing You and Saturated Fat Is Your Friend.” Another common mistake is to simply increase the amount of omega-3 that you eat. Many are now aware that the omega-3 to omega-6 ratio is very important, and should be about equal, but simply increasing omega-3 can be a dangerous strategy. You really need to minimize the omega-6. As explained by Goodrich:
LA Is a Primary Contributor to Chronic DiseaseWhen we talk about omega-6, we’re really referring to LA. They’re largely synonymous, as LA makes up the bulk — about 60% to 80% — of omega-6 and is the primary contributor to disease. Broadly speaking, there are three types of fats:
The missing hydrogen atoms make PUFAs highly susceptible to oxidation, which means the fat breaks down into harmful metabolites. OXLAMS (oxidized LA metabolites) are what have a profoundly negative impact on human health. While excess sugar is certainly bad for your health and should be limited to 25 grams per day or less, it doesn’t oxidize like LA does so it’s nowhere near as damaging. Over the last century, thanks to fatally flawed research suggesting saturated animal fat caused heart disease, the LA in the human diet has dramatically increased, from about 2 to 3 grams a day 150 years ago, to 30 or 40 grams a day. Goodrich cites research showing LA used to make up 1% to 3% of the energy in the human diet and now it makes up 15% to 20%. In my mind, this radical change has had the most catastrophic impact on human health in the history of the human race, as it is the complete opposite of what you need for optimal health. This dietary change has undoubtedly killed millions, probably hundreds of millions, prematurely and still continues to do so because people don't understand this.
On a side note, do not confuse LA with conjugated linoleic acid (CLA). While most think CLA and LA are interchangeable, they’re not. CLA has many potent health benefits and will not cause the problems that LA does. How Excess LA Consumption Damages Your HealthAt a molecular level, excess LA consumption damages your metabolism and impedes your body’s ability to generate energy in your mitochondria. There is a particular fat only located in your mitochondria — most of it is found in the inner mitochondrial membrane — called cardiolipin. Cardiolipin is made up of four fatty acids, unlike triglycerides which have three, but the individual fats can vary. Examples include LA, palmitic acid and the fatty acids found in fish oil, DHA and EPA. Each of these have a different effect on mitochondrial function, and depending on the organ, the mitochondria work better with particular kinds of fatty acids. For example, your heart preferentially builds cardiolipin with LA, while your brain dislikes LA and preferentially builds cardiolipin in the mitochondria with fats like DHA. Goodrich further explains:
Oxidation of Cardiolipin Controls AutophagyOxidation of cardiolipin is one of the things that controls autophagy. In other words, it’s one of the signals that your body uses when there’s something wrong with a cell, triggering the destruction and rebuilding of that cell. Your cells know that they’re broken when they have too many damaged mitochondria, and the process that controls this is largely the oxidation of omega-6 fats contained within cardiolipin. So, by altering the composition of cardiolipin in your mitochondria to one that's richer in omega-6 fats, you make it far more susceptible to oxidative damage. Goodrich cites research showing that when the LA in cardiolipin is replaced with oleic acid, another fat found in olive oil, the cardiolipin molecules become highly resistant to oxidative damage.
As mentioned, the primary problem is the OXLAMS, the oxidized byproducts. One of them is 4HNE, which is relatively easy to measure. Studies have shown there’s a definite correlation between elevated levels of 4HNE and heart failure. LA is broken down into 4HNE even faster when the oil is heated, which is why cardiologists recommend avoiding fried foods. OXLAMS Trigger CancerHeart disease isn’t the only condition triggered by excessive LA intake and the subsequent OXLAMS produced. It also plays a significant role in cancer. As noted by Goodrich, to induce cancer in animal models, you actually have to feed them seed oils. “So, this is a really fundamental process that we're talking about here,” he says. Animals typically develop cancer once the LA in their diet reaches 4% to 10% of their energy intake, depending on the cancer. In the breast cancer model, cancer incidents increase once 4% of calories are in the form of seed oils. Disturbingly, most Americans get approximately 8% of their calories from seed oils. “So, we're way over what these thresholds in the lab would suggest is a safe level of these fats based on the laboratory work in animals,” Goodrich says, adding:
4HNE is a mutagen, in other words, a toxin that causes DNA damage. One of the primary genes it damages is the P53 anticancer gene. Mutations in the P53 gene is found in 15% of cancers, making it one of the most common. As noted by Goodrich, “P53 is literally a cancer prevention gene. It's how your body regulates cancer. You can all draw your own conclusions about the wisdom of eating something that can cause that to break.” On a side note, one of the major jobs of glutathione is to detoxify 4HNE. You can often tell that you have excess 4HNE if your glutathione levels are low, as this means it’s being used up detoxifying 4HNE. LA and ObesityHigh-LA diets also cause obesity. “If you feed mice lots of saturated fat, they don't get fat and they don't get sick. It's only when you increase the LA in the diet from 1% to 8% that they become obese,” Goodrich says. Now, mice and rats are not exactly like humans, so how do we know all of this applies to us? Goodrich explains:
Increased LA Also Increases Your Risk of SunburnSo, to summarize, the dramatic increase in LA — and the oxidative end products that cause the damage — is the primary cause behind the increase in chronic diseases such as obesity, diabetes, heart disease and cancer. Simply lowering your LA intake to what your great-great grandparents used to eat, you can essentially eliminate almost every single one of the diseases that is now prematurely killing us. Interestingly enough, there’s even evidence showing eliminating seed oils from your diet will dramatically reduce your risk of sunburn, which is something Goodrich experienced first-hand. “Susceptibility to UV radiation damage is controlled by how much PUFAs are in your diet,” he says. “It's like a dial. They can control how fast it happens, and how fast you get skin cancer.” Seed Oils Raise Risk of ARDS and COVID-19Considering the metabolic and mitochondrial damage caused by LA, there’s reason to suspect LA may also play a role in COVID-19, as some white blood cells convert LA into leukotoxin. Essentially, LA contributes to the inflammatory domino effect that eventually kills. Goodrich explains:
As explained by Goodrich, the key toxin that produce the symptoms of ARDS is called leukotoxin, and leukotoxin is made from LA by white blood cells to kill pathogens. It’s toxic enough to where if you inject high-enough amounts of it into animals, it kills them in minutes. Leukocytes incubated with LA convert all of the LA into this toxin until there's none left, so, a major part of the disease process in ARDS is the conversion of LA into leukotoxin. That is what ends up killing patients.
How LA Triggers Heart DiseaseGoodrich also explains how high LA levels causes heart disease. One of the first things that happens in atherosclerosis is your macrophages, another type of leukocyte, turns into a foam cell, essentially a macrophage stuffed with fat and cholesterol. Atherosclerotic plaque is basically dead macrophages and other types of cells loaded with cholesterol and fat. This is why heart disease is blamed on dietary cholesterol and fat. However, researchers have found that in order for foam cells to form, the LDL must be modified through oxidation, and seed oils do just this. Seed oils cause the LDL to oxidize, thereby forming foam cells. LDL in and of itself does not initiate atherosclerosis. LDL's susceptibility to this oxidative process is controlled by the LA content of your diet.
Understanding Olive OilAs mentioned, olive oil also contains LA, but it also has other healthy fats. This makes olive oil a bit tricky. The main fat in olive oil is oleic acid, which is one of your body's favorite fats. Your body actually makes, it, which is why it's not considered an essential fat. Oleic acid is much more resistant to oxidation than LA, which is why olive oil is a pretty decent cooking oil. According to Goodrich, oleic acid is protective against both cardiolipin oxidation and LDL oxidation. Interestingly, oleic acid can also replace LA in LDL. Other fats, such as palmitic acid, cannot do that. The problem with olive oil is that it also has a fair amount of LA. “The percentages that I've seen quoted in literature range from 2%, which is awesome, to 22%, which is not good,” Goodrich says. The other problem is the olive oil market is hugely corrupt and fraught with fraud. Many olive oils are cut with cheaper seed oils, which raises the LA content. So, in summary, if you’re using olive oil, I strongly recommend keeping close track of your total LA intake. Anything over 10 grams a day is likely to be problematic (although the exact cutoff is still unknown, so this is merely an educated guess). If you really want to be on the safe side, consider cutting LA down to 2 or 3 grams per day, to match what our ancestors used to get before all of these chronic health conditions became widespread. If olive oil puts you over the limit, consider cooking with tallow or lard instead. Beef tallow is 46% oleic acid and lard is 36% oleic acid. High-LA Sources to AvoidAs Goodrich suggests, if you want to protect your health, you’d be wise to avoid all concentrated sources of LA. Top sources include chips fried in vegetable oil, commercial salad dressings, virtually all processed foods and any fried fast food, such as french fries.
The Importance of CarnosineBeef, even conventional grain-finished beef, has low LA. Grass fed beef has higher DHA and CLA, which makes it a healthier option. Beef is also the primary source of carnosine, which has been shown to be anti-atherogenic. Carnosine is also a mitochondrial stimulant, a sacrificial scavenger of advanced lipooxidation end products (ALEs), which is very similar to advanced glycation end products (AGEs). AGEs is another name for HNE and all the other reactive oxygen species generated from oxidizing LA. Carnosine is the most effective scavenger for HNE. Carbonylation of proteins is basically the process through which proteins in your body get damaged and become ineffective. HNE damages 24% of the proteins in your cells, so carnosine can go a long way toward warding off this cellular damage. As explained by Goodrich:
Take Control of Your Health by Lowering Your LA IntakeAs you can see, the evidence strongly suggests excessive LA is driving all the killer diseases today. The solution is simple though. Just lower your LA intake. There’s an easy way to do this. You don't have to send all your food out for analysis. Simply use an online nutritional calculator such as Chronometer to calculate your daily intake. Chronometer will tell you how much omega-6 you’re getting from your food down to the 10th of a gram, and you can assume 90% of that is LA. Again, anything over 10 grams is likely to cause problems. Since there’s no downside to limiting your LA, you’ll want to keep it as low as possible, which you do by avoiding high-LA foods. Keep in mind you’ll never be able to get to zero, and you wouldn’t want to do that either. So, just what should you eat to keep your LA intake low? Goodrich summarizes his own diet:
This is yet another reason for working out in a fasted state, which Goodrich also recommends. “I think working on a fasted state is one of the most important health things that you can do, without question,” he says. Goodrich also points out that the reason a strict ketogenic diet can cause liver failure is due to the omega-6 fats in the diet. It’s crucial to make sure the fats you eat are actually healthy. Goodrich is currently in the process of writing a book about this, as am I, in which all of this information will be laid out in even greater detail. In the meantime, you can learn more by visiting Goodrich’s blog, Yelling-Stop, or follow him on Twitter. In closing:
from http://articles.mercola.com/sites/articles/archive/2020/12/27/linoleic-acid-health-effects.aspx
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