Heart disease is the leading cause of death worldwide, yet much of the mainstream advice to prevent it is flawed. This article debunks five common pieces of bad heart health advice, including avoiding saturated fat, focusing solely on lowering LDL cholesterol, overprescribing statins, reducing fat intake to lower triglycerides, and relying on limited cholesterol markers. Instead, it emphasizes reducing insulin resistance, inflammation, and adopting a balanced diet with stable fats and low carbs.
Heart disease remains the number one killer globally. Despite this, much of the advice given to reduce heart disease risk has been misguided, sometimes even exacerbating the problem. Over the past 50 years, mainstream recommendations have contributed to turning heart disease into an epidemic.
In this article, we explore five of the absolute worst pieces of heart health advice commonly given by doctors and explain why they are incorrect. We also discuss what should be recommended instead for better heart health.
For decades, people have been told to cut out red meat, eggs, butter, and other sources of saturated fat. This advice originated from flawed intuition and early studies, such as the Seven Countries Study in the late 1950s and early 1960s. This study selectively chose seven countries out of 22 to support the hypothesis that saturated fat causes heart disease.
The reasoning was that since saturated fat and cholesterol were found in atherosclerotic plaques, eating saturated fat must cause plaque formation. However, this is a misunderstanding. The type of fat found in plaques correlates strongly with the fat composition in the body, which has changed over time. For example, in the 1960s, plaques contained mostly saturated fat, but by the 2000s, they contained mostly omega-6 fats.
Saturated fat can increase LDL cholesterol, but primarily the large, buoyant LDL particles, which are not atherogenic. The small, dense LDL particles are the harmful ones that cause plaques. Reducing saturated fat often leads to increased carbohydrate and omega-6 intake, which promotes insulin resistance and inflammation, key drivers of heart disease.
Saturated fat also raises HDL cholesterol, which is protective. Moreover, saturated fat is chemically stable and does not oxidize easily, unlike polyunsaturated fats such as omega-6, which are unstable and promote inflammation when oxidized.
Cows, a primary source of saturated fat in meat, get 70% of their calories from saturated fatty acids and 0% from carbohydrates. Humans convert short-chain fatty acids and carbohydrates into saturated and monounsaturated fats like stearic and oleic acid. Thus, the fat stored in our bodies depends little on dietary fat type but more on metabolic processes.
The key is not the classification of fat but how it behaves biologically. Stable fats like saturated and monounsaturated fats (e.g., olive oil) are beneficial, while unstable polyunsaturated fats (especially omega-6) increase oxidative stress and inflammation.
LDL cholesterol is often labeled as "bad cholesterol," but LDL is actually a carrier of cholesterol essential for bodily functions. LDL only becomes harmful when oxidized or glycated, processes driven by insulin resistance, excess omega-6 fats, sugar, and smoking.
Following advice to eat high-carb diets and excess omega-6 fats promotes the formation of small, dense LDL particles that penetrate blood vessel walls and cause plaques. Cholesterol in plaques acts as a repair mechanism for vessel damage caused by inflammation.
Doctors often prescribe statins when cholesterol exceeds a certain threshold (e.g., 200 mg/dL) as primary prevention. However, statins have a high number needed to treat (NNT): about 100 people must take statins for five years for one person to avoid a heart attack during that time.
Statins block cholesterol production but also inhibit CoQ10 synthesis, a vital enzyme for mitochondrial energy production (ATP). This reduction in energy affects organs with high energy demands like the heart, brain, liver, kidneys, and muscles.
Common side effects include muscle pain and weakness. Internal organ damage can occur silently since these organs lack pain receptors.
Statins may be more justified for secondary prevention (after a heart attack) or in individuals with multiple risk factors or genetic predispositions (e.g., high lipoprotein(a)). However, statin use increases the risk of type 2 diabetes by 10-25%.
If prescribed statins, it is crucial to also take CoQ10 supplements (200-600 mg/day) with fatty meals to mitigate side effects, though this is often not recommended.
This advice is based on the misconception that blood triglycerides come from dietary fat. In reality, triglycerides are primarily produced from excess carbohydrates, sugar, and alcohol in the presence of insulin.
Reducing dietary fat often leads to increased carbohydrate intake, which raises triglycerides and worsens insulin resistance. Conversely, low-carbohydrate, high-fat diets effectively lower triglycerides.
High triglycerides indicate insulin resistance, where cells resist fat uptake, leaving fat circulating in the bloodstream.
Doctors often reassure patients based on total cholesterol under 200 mg/dL and LDL under 130 mg/dL. However, these markers are limited and do not provide the full picture.
Important markers often ignored include:
Advanced tests like coronary calcium scoring can detect plaque buildup but are rarely done routinely.
Much of the traditional advice on heart disease prevention is outdated and potentially harmful. Understanding the role of inflammation, insulin resistance, and the types of fats consumed is crucial. Instead of fearing saturated fat and focusing solely on lowering LDL cholesterol, a more nuanced approach that includes lifestyle changes, proper testing, and balanced nutrition is essential for heart health.
If you have received any of the five pieces of bad advice discussed, consider discussing these insights with a healthcare professional who understands the complexities of heart disease.
Your heart health depends on informed choices and personalized care, not just generic guidelines.
