The Silent Threat: Why Your Cholesterol Could Be High, Even if You’re Slim and Healthy
We often picture someone at high risk of a heart attack as being overweight, perhaps middle-aged, favouring greasy foods and leading a sedentary lifestyle. However, according to leading cardiologist Dr Oliver Guttman, this common perception can be dangerously misleading. One of the most significant risk factors for cardiovascular disease is high cholesterol, a condition that can affect individuals who appear slim, fit, and otherwise perfectly healthy.
While lifestyle choices such as consuming a diet rich in saturated fats, excessive alcohol consumption, and a lack of physical activity undoubtedly contribute to an increased risk of heart attack, Dr Guttman emphasises that body shape alone is not a reliable indicator of cardiovascular health.
“Cholesterol is influenced by many factors beyond body weight,” Dr Guttman explains. “Genetics, diet, age, and physical activity can all have an effect on cholesterol levels. The problem is that high cholesterol usually causes no symptoms – until it is too late.”
Often dubbed a ‘silent killer’, elevated cholesterol levels significantly increase the risk of heart attack, stroke, and other forms of cardiovascular disease. In Australia, cardiovascular disease remains a leading cause of death and disability, claiming tens of thousands of lives each year. To help Australians better understand and protect themselves from heart disease, Dr Guttman helps us separate fact from fiction and understand the difference between ‘good’ and ‘bad’ cholesterol.
Understanding Cholesterol: More Than Just a Lipid
At its core, cholesterol is a waxy, fat-like substance, scientifically known as a lipid, which is present in every cell of our body. Crucially, not all cholesterol is detrimental to our health.
High-Density Lipoprotein (HDL) Cholesterol: Often referred to as ‘good’ cholesterol, HDL plays a vital role in maintaining cardiovascular health. It acts as a scavenger, collecting excess cholesterol from the bloodstream and transporting it back to the liver. Here, the cholesterol can be processed and eliminated from the body.
Low-Density Lipoprotein (LDL) Cholesterol: This is the ‘bad’ cholesterol. Unlike HDL, LDL cholesterol can accumulate in the walls of our arteries. Over time, this build-up forms fatty deposits, known as plaque, which can narrow the blood vessels. This narrowing restricts blood flow, significantly increasing the risk of heart attack and stroke. When HDL levels are too low, the body struggles to remove excess LDL cholesterol, allowing it to accumulate more readily.
Dr Guttman highlights that the total cholesterol figure alone doesn’t provide a complete picture of an individual’s cardiovascular risk. “Two people can have the same total cholesterol level but very different cardiovascular risk depending on how those components are balanced,” he states. “Doctors also consider other factors such as blood pressure, age, smoking status, diabetes, and family history when assessing heart disease risk – so it’s never about focusing on a single number alone.”
The Slim and Healthy Paradox: Can You Still Have High Cholesterol?
A common misconception is that if you are slim and physically active, you are automatically in the clear regarding cholesterol concerns. Dr Guttman warns that this belief can be dangerously misleading.
“Being slim does not guarantee healthy cholesterol levels,” he stresses. “Cholesterol is influenced by many factors beyond weight. Some people who appear very fit and maintain a healthy weight can still have high cholesterol because their body naturally produces more of it.”
Furthermore, a predisposition to high cholesterol can be inherited. Genetic factors mean that some individuals may have a higher cholesterol level regardless of their lifestyle.
It’s also important to consider not just overall body fat, but also visceral fat. This is the fat stored deep within the abdomen, surrounding vital organs. This type of fat has been linked to higher levels of harmful LDL cholesterol and a greater overall cardiovascular risk. Research indicates that diets high in saturated fats and ultra-processed foods can promote the storage of visceral fat, even in individuals who appear outwardly slim.
“The only way to know your levels is through a blood test,” Dr Guttman advises. “You should have them checked regularly to make sure they are not creeping up unnoticed.”
Women and Cholesterol: A Different Risk Profile?
While women generally experience heart attacks at a later age than men, cholesterol remains a significant risk factor for them. Dr Guttman explains that before menopause, women often benefit from the protective effects of oestrogen, which can delay the onset of heart disease. However, this protective effect diminishes significantly after menopause, leading to a sharp increase in risk.
“Heart disease remains one of the leading causes of death in women,” he points out. Compounding this, the symptoms of heart disease in women can often be less typical than the classic crushing chest pain commonly associated with men. This can lead to delayed diagnosis and treatment.
“For these reasons, it’s important that women also pay attention to their cardiovascular health – including cholesterol levels and other risk factors – and seek medical advice if they develop concerning symptoms.”
Statins: Separating Fact from Fiction About Side Effects
Statins are among the most widely prescribed medications globally and are highly effective at lowering cholesterol and, consequently, reducing the risk of heart attack and stroke. Despite their proven benefits, many patients express reluctance to take them, often due to concerns about side effects.
Statins are frequently blamed for common aches and pains experienced during midlife. However, extensive clinical trials suggest that genuine statin-related side effects are far less common than widely believed. A significant challenge for healthcare professionals is patient adherence. Studies reveal that a considerable number of patients discontinue statin therapy within the first couple of years of treatment, which can prevent them from achieving their target cholesterol levels.
For individuals who genuinely cannot tolerate a particular statin, doctors have options. They can often prescribe a different type of statin or adjust the dosage. In some complex cases, patients may be referred to specialist clinics to explore alternative cholesterol-lowering treatments.
Like all medications, statins do carry some risks, but serious complications are rare. A severe muscle condition called rhabdomyolysis, where muscle tissue breaks down and can potentially damage the kidneys, occurs in only a very small percentage of patients. There is also some evidence suggesting statins may slightly increase the risk of developing type 2 diabetes, and they can occasionally affect liver function, which is why regular blood tests are conducted to monitor patients.
However, experts overwhelmingly agree that these potential risks are minor when weighed against the substantial benefits for individuals with elevated cholesterol or an increased risk of cardiovascular disease.
Dr Guttman summarises: “For people with raised cholesterol or cardiovascular risk, the benefits of statins in preventing heart attacks and strokes generally far outweigh the risks, and doctors consider these factors carefully before recommending treatment.”
Can Diet Truly Reverse High Cholesterol?
While statins are powerful pharmaceutical tools, Dr Guttman reiterates that they do not negate the importance of a healthy lifestyle. Diet continues to play a crucial role in managing and potentially lowering cholesterol levels.
Incorporating foods rich in soluble fibre, such as oats, beans, and lentils, can be highly effective in reducing levels of harmful LDL cholesterol. Oats, in particular, contain beta-glucan, a type of soluble fibre that forms a gel-like substance in the digestive tract. This gel binds to cholesterol, preventing a portion of it from being absorbed into the bloodstream.
Research published recently indicated that consuming porridge for as little as two days could reduce LDL cholesterol levels by up to 10 per cent, particularly in individuals with metabolic syndrome – a cluster of conditions including obesity, high blood pressure, and elevated blood sugar, all of which significantly increase the risk of heart disease. This underscores the powerful impact dietary choices can have on our cardiovascular health.
