Leena Watts
Coronary heart disease (CHD) is the leading cause of death in the United States and Australia. While there is not one single cause, an unhealthy diet can be a contributing factor. A diet high in saturated fat, salt, and sugar can increase your risk of CHD by raising cholesterol levels and blood pressure. Conversely, a diet rich in fruits and vegetables, whole grains, legumes, nuts and seeds, and unsaturated fats can help to reduce your risk of CHD by improving cholesterol levels and blood pressure. In addition to diet, other risk factors for CHD include smoking, diabetes, obesity, family history, and lack of exercise.
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What You'll Learn
Mediterranean diet
A Mediterranean diet is a collection of traditional dietary habits from countries adjoining the Mediterranean Sea. It is high in monounsaturated fats, principally from olive oil, low in saturated fats, high in complex carbohydrates from legumes, and high in fibre, mostly from vegetables and fruits.
The Mediterranean diet has been shown to improve CHD prognosis and is inversely associated with CHD mortality. Large cohort studies have shown that high adherence to the Mediterranean diet is associated with reduced blood pressure levels and markers of vascular inflammation. The Mediterranean diet is also associated with a 40% decreased risk of incident CHD in a Spanish cohort of 41,078 participants over 10 years. In another study, a two-point increase in the Mediterranean diet score was associated with lower CHD mortality by 25% among women and 19% among men.
The Mediterranean diet is also known to improve surrogates of cardiovascular disease, such as waist-to-hip ratio, lipids, and markers of inflammation. The high content of vegetables, fresh fruits, cereals, and olive oil guarantees a high intake of beta-carotene, vitamins C and E, polyphenols, and various important minerals. These key elements are responsible for the beneficial effects of the diet on human health, especially cardiovascular health.
The Mediterranean diet consists of fish, monounsaturated fats from olive oil, fruits, vegetables, whole grains, legumes/nuts, and moderate alcohol consumption. It is recommended to consume plenty of fresh fruit and vegetables (5 portions a day) and whole grains, and to limit salt intake to no more than 6g (0.2oz) a day.
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Fish and n-3 fatty acids
Several dietary interventions have been shown to decrease the risk of coronary heart disease (CHD). One of these interventions includes the consumption of fish and n-3 fatty acids.
The protective effects of fish and n-3 fatty acids against CHD are attributed to their ability to improve various risk markers associated with the disease. Fish consumption has been found to be inversely associated with CHD risk markers such as C-reactive protein (CRP) and positively associated with HDL cholesterol (HDL-C), often referred to as "good" cholesterol due to its protective effects on arteries.
The n-3 fatty acids found in fish, such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), are believed to be the key components providing these cardiovascular benefits. These fatty acids are naturally found only in marine sources. However, it is important to note that the consumption of fish and n-3 fatty acids should be complemented by other healthy lifestyle choices, such as smoking cessation and regular physical activity, to maximize the prevention of CHD and SCD.
While the evidence suggests a decreased risk of CHD with fish and n-3 fatty acid consumption, it is important to be mindful of potential risks associated with certain types of fish. For example, dietary intakes of methylmercury from specific fish have been hypothesized to increase the risk of CHD. As such, it is essential to consult reputable sources and follow guidelines for safe fish consumption to maximize the benefits while mitigating potential risks.
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High cholesterol and blood pressure
High cholesterol and high blood pressure are closely linked. They are two of the biggest causes of heart disease and often occur together. When the body cannot clear cholesterol from the blood, it deposits along the artery walls, causing them to harden and narrow. This means the heart has to work harder to pump blood, which causes blood pressure to increase. High blood pressure can also damage arteries and cause tears in artery walls, where excess cholesterol collects.
High cholesterol and high blood pressure are two of the main risk factors for heart disease, and both can be addressed with lifestyle changes. A low-fat, high-fibre diet is recommended, including plenty of fresh fruit and vegetables (at least five portions a day) and whole grains. You should limit your salt intake to a maximum of 6g a day and reduce your consumption of red meat, processed meat, and sugary foods and drinks. You should also avoid saturated fats, which increase the levels of "bad" cholesterol in your blood. Instead, a balanced diet should include unsaturated fats, which increase "good" cholesterol and help reduce blockage in your arteries.
You can also lower your cholesterol and blood pressure by getting regular exercise. Aim for at least 150 minutes of moderate-intensity cardio activity per week. Losing excess weight can also help, as obesity is linked to high cholesterol and blood pressure. Quitting smoking is important, too, as it lowers your "good" cholesterol. If you drink alcohol, limit your intake and avoid binge drinking, as this increases the risk of a heart attack.
The Mediterranean diet has been shown to reduce the risk of coronary heart disease (CHD). This involves eating more fruit and vegetables, legumes, complex carbohydrates, fish and poultry, and using olive oil as the main source of dietary fat. The DASH diet is also designed to lower blood pressure.
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High salt and sugar intake
While there are a variety of factors that contribute to the development of coronary heart disease (CHD), dietary choices play a significant role. High salt and sugar intake, in particular, are considered risk factors that can adversely affect cardiovascular health.
Salt, or sodium chloride, is often associated with increased blood pressure. Consuming too much salt can lead to hypertension, which is a major contributor to CHD. By reducing salt intake, individuals can lower their blood pressure and subsequently reduce their risk of developing CHD. This is supported by studies that have shown a direct link between salt reduction and a decreased incidence of CHD.
Sugar, especially in excessive amounts, can also negatively impact cardiovascular health. A high sugar intake contributes to insulin resistance and increases the risk of developing diabetes. Diabetes is a significant risk factor for CHD, as it is associated with an increased prevalence of coronary atherosclerosis. Additionally, sugar can promote inflammation and oxidative stress, which are detrimental to cardiovascular health.
The consumption of refined carbohydrates, such as sugar, has been a topic of debate in relation to CHD. While earlier hypotheses suggested that refined carbohydrates played a major role in CHD, more recent evidence has led to a shift in perspective. It is now believed that excessive intake of saturated fatty acids (SFA) is not the key dietary factor in CHD, and the focus has moved towards the impact of sugar and refined carbohydrates.
Overall, it is important to maintain a balanced diet and moderate salt and sugar intake to reduce the risk of CHD and improve cardiovascular health. While salt and sugar are not the sole contributors to CHD, they are significant factors that individuals can modify through dietary adjustments.
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Alcohol consumption
While the relationship between alcohol consumption and Coronary Heart Disease (CHD) is unclear, several studies have found a link between the two. Excessive alcohol consumption can lead to weight gain and obesity, which are risk factors for CHD. Additionally, alcohol can increase blood pressure, which is another risk factor.
Some studies have suggested that low to moderate alcohol consumption may be associated with a decreased risk of CHD. For example, a 23-year report from the British Doctor's Study found that consuming 2-3 units (16-24 g) of alcohol per day was associated with a 28% reduction in CHD-related deaths. Similarly, cohort and case-control data have indicated a link between low to moderate alcohol intake and a reduced risk of ischemic heart disease (IHD).
However, it is important to note that heavy drinking is generally associated with an increased risk of vascular disease and CHD. The pattern of drinking and the type of drink consumed may also have an impact on vascular risk. Binge drinking, for example, increases the risk of a heart attack.
Overall, while some studies suggest potential benefits of low to moderate alcohol consumption on CHD risk, excessive alcohol intake is clearly detrimental. It is important to follow recommended drinking guidelines and not exceed the maximum limits to maintain good heart health.
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Frequently asked questions
CHD stands for coronary heart disease. It is the leading cause of deaths in the United States.
Diets that are high in saturated fat, trans fat, salt, and sugar can increase the risk of CHD. Saturated fat increases the levels of bad cholesterol in the blood, which can lead to plaque buildup in the arteries. A high salt diet is linked to hypertension or high blood pressure, which can also increase the risk of CHD.
A low-fat, high-fibre diet is recommended for those looking to reduce their risk of CHD. This includes plenty of fresh fruits and vegetables, whole grains, and unsaturated fats. The Mediterranean diet has also been shown to be effective in reducing the risk of CHD.
Foods that are high in saturated fat, such as butter, coconut oil, palm oil, lard, and full-fat dairy products, should be avoided. Processed meats, fast food, and foods high in salt and sugar should also be limited.
