Cardiovascular disease is a group of conditions affecting the heart and blood vessels. For GCSE Food Preparation and Nutrition, it is important to understand how diet can contribute to risk, particularly through coronary heart disease and high blood pressure. This guide explains key terms, the effects of saturated fat, salt and excess energy, and how practical food choices may help support cardiovascular health. Diet is only one influence: age, genetics, smoking, physical activity and other lifestyle factors can also affect an individual’s risk.
What is cardiovascular disease?
Cardiovascular disease, often shortened to CVD, is a general term for diseases of the heart and circulatory system. The circulatory system includes the heart, blood and blood vessels, such as arteries and veins.
Two important conditions linked to this topic are coronary heart disease and high blood pressure. They are related, but they are not the same condition.
Coronary heart disease
Coronary heart disease, or CHD, happens when the coronary arteries become narrowed or blocked. These arteries supply the heart muscle with oxygen-rich blood.
A fatty deposit, sometimes called plaque, can build up inside an artery. The build-up and hardening of arteries is known as atherosclerosis. As the artery becomes narrower, less blood can reach the heart muscle. In serious cases, a blood clot may block the artery and cause a heart attack.
How can diet affect the risk of CHD?
Diet can influence several risk factors:
- Saturated fat: eating too much saturated fat can contribute to raised levels of low-density lipoprotein cholesterol, usually called LDL cholesterol. LDL cholesterol is often described as ‘bad’ cholesterol because high levels can contribute to fatty deposits in artery walls.
- Trans fats: high intakes are associated with an increased risk of heart disease. Current food guidance should be checked because recommendations and labelling information can change.
- Excess energy: regularly consuming more energy than the body uses can lead to excess weight. Being overweight or obese can increase the risk of cardiovascular disease.
- Salt: a diet high in salt can contribute to high blood pressure, which increases the strain on the heart and blood vessels.
This does not mean that eating one food causes CHD. Risk develops through a combination of dietary, genetic and lifestyle factors over time.
High blood pressure
Blood pressure is the force of blood pushing against the walls of the arteries as the heart pumps. High blood pressure, also called hypertension, means that this pressure is consistently higher than it should be. It can put extra strain on the heart and damage blood vessels over time.
High blood pressure often has no obvious symptoms, so a person may not know they have it without a check. It can increase the risk of conditions including CHD and stroke. Do not confuse blood pressure with blood cholesterol: blood pressure is the force of the blood against artery walls, while cholesterol is a type of fatty substance carried in the blood.
How can diet affect blood pressure?
Eating too much salt can make it harder for the body to regulate fluid levels, which may contribute to raised blood pressure. Salt is found in foods such as processed meats, savoury snacks, some ready meals, stock products and sauces. The amount varies between products, so reading nutrition labels can help when comparing choices.
Eating a balanced diet, maintaining a healthy body weight and choosing a variety of foods can support overall cardiovascular health. Foods such as fruit, vegetables, pulses and wholegrain cereals provide fibre and other nutrients. Replacing some foods high in saturated fat with sources of unsaturated fat, such as vegetable oils, nuts, seeds and oily fish, may be a more heart-friendly choice. Portion size and the overall pattern of eating also matter.
Applying the theory in practical food work
When adapting or designing a dish, think about how changes affect both nutrition and acceptability. For example, you could:
- compare the saturated fat and salt content of similar ingredients using nutrition labels;
- choose leaner cuts of meat or remove visible fat where appropriate;
- use beans, lentils or vegetables to replace some of a higher-fat meat ingredient;
- use herbs, spices, garlic, citrus or other flavourings to reduce reliance on salt;
- choose wholegrain ingredients where suitable for the dish and its intended consumer;
- measure oils, cheese and other energy-dense ingredients carefully rather than adding them automatically.
A healthier modification must still meet the brief. Consider flavour, texture, appearance, cost, preparation skills, cooking methods, dietary needs and the target consumer. For example, simply removing salt may produce a bland dish, so plan alternative flavour carefully and evaluate the final result through sensory testing.
Exam-ready summary
- Cardiovascular disease affects the heart and circulatory system.
- Coronary heart disease involves narrowed or blocked coronary arteries.
- Atherosclerosis is the build-up and hardening of fatty deposits in artery walls.
- Too much saturated fat may contribute to raised LDL cholesterol and fatty deposits.
- Too much salt can contribute to high blood pressure.
- High blood pressure places extra strain on the heart and blood vessels.
- Excess energy intake can lead to excess weight, which may increase cardiovascular risk.
- A balanced diet, suitable portion sizes and appropriate ingredient choices can support health, but diet is only one risk factor.
Retrieval checklist
Can you define cardiovascular disease, coronary heart disease, hypertension, LDL cholesterol and atherosclerosis? Can you explain two ways diet may affect cardiovascular risk? Can you suggest three realistic changes to a recipe and explain how each change could improve its nutritional profile?
For the specification wording, use the official AQA specification. Health and dietary guidance can change, so check current information from AQA, the NHS, the Food Standards Agency or GOV.UK when revising.
Frequently asked questions
Is cardiovascular disease the same as coronary heart disease?
No. Cardiovascular disease is the wider group of conditions affecting the heart and blood vessels. Coronary heart disease is one condition within this group.
Does all fat increase the risk of cardiovascular disease?
No. Fat is needed in the diet, but different fats have different effects. The focus is on limiting foods high in saturated fat and choosing suitable sources of unsaturated fat as part of a balanced diet.