Explain how lifestyle and medical risk factors increase the chance of developing CHD.

Coronary Heart Disease (CHD) is a condition where the coronary arteries, the major blood vessels that supply the heart with blood, become clogged with deposits of cholesterol. This can lead to a heart attack. There are several lifestyle and medical risk factors that can increase the chance of developing CHD.

1. Lifestyle Risk Factors:

   • Smoking: Nicotine in cigarettes constricts blood vessels, making it harder for blood to reach the heart. Additionally, carbon monoxide in smoke replaces some of the oxygen in the blood, forcing the heart to work harder to get enough oxygen.
   • Poor Diet: A diet high in saturated fat can lead to high cholesterol, which can cause the arteries to clog. A diet high in salt can lead to high blood pressure, which can damage the arteries and make it easier for them to clog.
   • Lack of Exercise: Regular exercise helps maintain a healthy weight and lowers blood pressure and cholesterol levels. Lack of exercise can lead to obesity, high blood pressure, and high cholesterol, all of which increase the risk of CHD.
   • Excessive Alcohol: Drinking too much alcohol can raise blood pressure and cholesterol levels, and contribute to weight gain, all of which increase the risk of CHD.

2. Medical Risk Factors:

   • High Blood Pressure: Over time, high blood pressure can damage the arteries, making them more likely to clog.
   • High Cholesterol: High levels of cholesterol in the blood can lead to the formation of plaques in the arteries, which can clog them.
   • Diabetes: Diabetes significantly increases the risk of CHD. High blood sugar can damage the arteries, making them more likely to clog.
   • Family History: If a close family member has CHD, you are more likely to develop it. This is likely due to shared genetic factors.

By managing these risk factors, through lifestyle changes and medical treatment if necessary, the risk of developing CHD can be significantly reduced.