Madeleine Hull
Atherosclerosis is a serious condition that affects the arteries, causing them to harden and narrow, which can eventually lead to decreased blood flow and an increased risk of heart attacks and strokes. The condition is often caused by poor diet and lifestyle choices, with about 90% of cases being due to the formation of lipid/cholesterol-based plaques that form under the lining of the arteries. A diet that is high in saturated fats, trans fats, and cholesterol can contribute to the development of atherosclerosis, whereas a diet rich in fruits and vegetables, healthy fats, and whole grains can help to reduce the risk.
Characteristics and values of a diet that contributes to atherosclerosis:
| Characteristics | Values |
|---|---|
| High cholesterol | Elevated levels of LDL (low-density lipoprotein) cholesterol can lead to plaque formation. |
| High blood pressure | Also known as hypertension, this can damage artery walls and make them more susceptible to plaque build-up. |
| Inflammation | Chronic inflammation can trigger atherosclerosis by causing damage to artery walls and encouraging plaque formation. |
| Smoking | Tobacco use is a significant risk factor. |
| Obesity | Excess weight and an unbalanced diet can contribute to the development and progression of atherosclerosis. |
| Alcohol consumption | Excessive drinking can harm your arteries. |
| Lack of exercise | Physical activity can improve blood circulation and lower blood pressure. |
| Stress | Emotional stress can worsen atherosclerosis as the body requires more oxygen but blood flow is disrupted. |
| High sodium intake | Reducing sodium is crucial for managing hypertension. |
| Lack of fruits and vegetables | Fruits and vegetables are rich in dietary fibre, vitamins, minerals, and antioxidants, contributing to optimal heart health. |
| Lack of whole grains | Whole grains are nutrient-dense and can help regulate cholesterol levels and blood pressure. |
| High saturated fat intake | Saturated fats can increase LDL cholesterol levels. |
| Low omega-3 fatty acid intake | Omega-3 fatty acids can reduce inflammation and blood clotting, contributing to clogged arteries. |
| Lack of antioxidants | Antioxidants help combat inflammation and oxidative stress in the arteries. |
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What You'll Learn
High cholesterol and high blood pressure
Atherosclerosis is the underlying cause of heart attacks and strokes. It is the buildup of plaque in the arteries, which can damage blood vessels and lead to more plaque buildup. This narrowing of the arteries can limit or block the flow of blood to the heart muscle, which may lead to chest pain (angina) or heart attack.
High blood pressure is a major cause of atherosclerosis. Blood pressure is the pressure inside the arteries, reported in two numbers, for example, "125 over 80". The top number is the systolic blood pressure, which is the peak pressure when the heart pumps and expands the arteries. Higher blood pressures mean that with each beat, arteries throughout the body swell and stretch more than they would normally. This stretching can injure the endothelium, the delicate lining of all arteries, causing them to become stiffer over time. Healthy endothelium works to prevent atherosclerosis, but an injured endothelium allows more "bad" LDL cholesterol and white blood cells to enter the lining of the artery. The cholesterol and cells then build up in the artery wall, eventually forming the plaque of atherosclerosis.
High blood pressure alone increases the risk for atherosclerosis, but it is especially dangerous if you smoke, have diabetes, or have unhealthy cholesterol levels. High blood pressure is also the most investigated and most widespread among all modifiable risk factors for atherosclerosis development. Treating high blood pressure can offer dramatic protection against atherosclerosis. Much of the decline in the death rate from heart attacks and strokes is due to improved treatment of high blood pressure over the past 50 years.
High cholesterol is also a key contributor to atherosclerosis. Population studies have demonstrated that elevated levels of LDL cholesterol and apolipoprotein B (apoB) are directly associated with the risk of atherosclerotic cardiovascular events. The infiltration and retention of apoB-containing lipoproteins in the artery wall is a critical initiating event that sparks an inflammatory response and promotes the development of atherosclerosis. Arterial injury causes endothelial dysfunction, promoting modification of apoB-containing lipoproteins and infiltration of monocytes into the subendothelial space. This process leads to the formation of foam cells, which is the hallmark of the fatty streak phase of atherosclerosis. Lowering LDL-cholesterol levels can help prevent atherosclerosis and subsequent cardiovascular disease.
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Inflammation and oxidative stress
Atherosclerosis is a chronic inflammatory disease of the vascular system and is the leading cause of cardiovascular disease worldwide. The disease is characterised by the accumulation of inflammatory cells and lipids in the blood vessel wall.
The oxidative stress that occurs during the breakdown of the oxidant/antioxidant balance within our bodies plays a major role in the development of atherosclerotic diseases. The production of ROS is balanced by ROS-scavenging antioxidant systems, which may become dysfunctional, contributing to oxidative stress. This increased oxidative stress promotes the conversion of LDL cholesterol to more atherogenic oxidised LDL (ox-LDL), which further increases oxidative stress and contributes to the inflammatory state of atherosclerosis.
Several risk factors for atherosclerosis, such as hypertension, diabetes, and smoking, have been linked to increased oxidative stress and inflammation. Hypertension, for example, may exert oxidative stress directly on the arterial wall, predisposing and accelerating atherosclerosis. Similarly, patients with diabetes exhibit increased peroxidation and autooxidation of LDL cholesterol, contributing to oxidative stress. Smoking is also a common mechanism for generating oxidative stress and inflammation due to the abundant free radical species and reactive oxidants found in cigarette smoke.
Preventive and therapeutic measures for atherosclerosis aim to influence basic pathogenetic mechanisms, including inflammation and oxidative stress. This includes incorporating anti-inflammatory and antioxidant-rich foods into the diet, such as fruits, vegetables, and fish, particularly oily fish.
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Obesity and unbalanced diets
Unbalanced diets that are high in saturated and trans fats, such as fatty meats, sausages, bacon, butter, cakes, biscuits, pizza, and fried foods, contribute to the development of atherosclerosis. These unhealthy fats can be replaced with heart-healthy alternatives like monounsaturated and polyunsaturated fats, found in avocados, olive oil, nuts, seeds, and fatty fish like salmon and trout. These healthier sources of fat can help reduce LDL cholesterol levels, a key contributor to plaque formation.
Obesity, or excess weight, is a significant risk factor for atherosclerosis. Maintaining a healthy body shape through a balanced diet and regular physical activity can help prevent and manage this condition. Fibre-rich foods, such as whole grains, oats, legumes, beans, fruits, and vegetables, are important for lowering LDL cholesterol and promoting heart health. Antioxidant-rich foods, including fruits and vegetables, also play a crucial role in combating inflammation and oxidative stress in the arteries, which are key factors in the development of atherosclerosis.
In addition to dietary modifications, staying hydrated by drinking plenty of water is essential for overall heart health and optimal circulation. Maintaining a balanced distribution of body fat is also important, as excess fat accumulation in certain areas, such as the abdominal region, can increase the risk of atherosclerosis. Regular exercise, stress management, and quitting smoking are crucial components of a comprehensive strategy to combat atherosclerosis and improve overall cardiovascular health.
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Alcohol consumption
Excessive alcohol consumption has been associated with a wide range of medical conditions, including an increased risk of stroke and stroke mortality. A Finnish study found that binge drinking was associated with accelerated atherosclerotic progression in an 11-year follow-up of middle-aged men. The progression of atherosclerosis was notably worse among men who consumed six or more drinks on a single occasion. Additionally, the risk of stroke was heightened in men who experienced at least one hangover per year, independent of their total alcohol consumption.
Moderate alcohol consumption, on the other hand, has been linked to a lower risk of stroke compared to abstinence. In a community setting, consuming up to seven drinks per week in early to middle age was associated with a reduced risk of heart failure in both men and women, although the association was more pronounced in men. This finding suggests that drinking patterns and frequency play a role in the impact of alcohol on health outcomes.
Healthcare professionals emphasize the importance of addressing drinking patterns when discussing alcohol consumption with patients, especially those at higher risk of atherosclerosis or with a history of cardiovascular events. Clinical guidelines generally recommend limiting alcohol intake to one drink per day for non-pregnant women and two drinks per day for men.
In summary, excessive alcohol consumption and binge drinking patterns contribute to an elevated risk of atherosclerosis and associated complications, such as stroke. Moderate alcohol consumption, characterized by lower quantities and consistent drinking patterns, may have a less detrimental or slightly protective effect. However, further research is needed to fully understand the complex relationship between alcohol consumption and atherosclerotic risk.
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Sodium intake
The study by Wuopio et al. is particularly noteworthy as it found that higher dietary salt intake increased the risk of coronary artery disease (CAD) and carotid atherosclerosis, even after adjusting for blood pressure. This suggests that salt intake affects multiple pathological mechanisms that contribute to the rapid progression of atherosclerosis.
The impact of excessive sodium intake on blood pressure and CVD risk is well-established. High sodium intake can lead to increased insulin sensitivity and improved glucose tolerance and insulin resistance. However, it is essential to note that sodium restriction can also have adverse effects. Some studies have shown that low sodium intake can lead to endothelial dysfunction, increased plaque accumulation, and vascular inflammation, particularly in individuals with hypertension and type 2 diabetes.
The controversy surrounding the relationship between sodium intake and atherosclerosis may be due to the different methods used to measure sodium intake and the characteristics of the study populations. For example, dietary survey-based methods may be convenient, but they often result in inaccurate estimations of sodium intake due to reporting errors and incomplete data. On the other hand, 24-hour urine sodium measurement is considered the gold standard method for its accuracy and consistency.
In conclusion, while the exact mechanisms are still being explored, the current evidence suggests that excessive sodium intake contributes to the development of atherosclerosis and increases the risk of cardiovascular disease. Therefore, it is generally recommended to reduce sodium intake to maintain optimal health, especially for individuals with existing hypertension or CVD.
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Frequently asked questions
Atherosclerosis is mainly caused by the development of plaque on the inner walls of arteries due to high cholesterol. A diet that contributes to this condition is one that is high in saturated fats and trans fats, such as fatty meat, sausages, bacon, butter, cakes, biscuits, pizza and fried foods.
To prevent atherosclerosis, it is recommended to avoid processed foods and limit sodium (salt) intake. Alcohol consumption should also be moderated as excessive drinking can harm your arteries.
A balanced diet that is rich in fruits and vegetables is recommended to prevent atherosclerosis. Specifically, leafy greens, tomatoes, onions, olive oil, flax seeds, and cruciferous vegetables like broccoli, cabbage, and cauliflower. Fish, especially oily fish, is also recommended.
