14) Risk factors: Non-communicable diseases:

1. Risk Factors Increase Disease Risk

• Risk factors are lifestyle or environmental factors that increase the chance of developing a disease.

• Examples include smoking, alcohol consumption, and exposure to harmful substances like asbestos, which can cause respiratory diseases like cancer.

2. Disease from Multiple Risk Factors

• Many non-communicable diseases result from a combination of risk factors rather than just one.

• Factors may vary by region due to differences in lifestyle and income:

  • Developed countries: higher income can lead to high-fat diets.

  • Deprived areas: higher rates of smoking, poor diet, and lack of exercise, increasing risks for cardiovascular disease and Type 2 diabetes.

3. Risk Factors that Directly Cause Diseases

• Some risk factors have a direct effect on disease development:

  • Smoking: Causes cardiovascular and lung diseases, including cancer, by damaging arteries and lung lining.

  • Obesity: Increases risk of Type 2 diabetes by making the body less responsive to insulin.

  • Alcohol: Leads to liver disease and brain damage by harming nerve cells.

  • Smoking/Alcohol During Pregnancy: Causes health problems in unborn babies.

  • Carcinogens: Exposure to substances or radiation (e.g., X-rays) can directly cause cancer.

4. Correlation vs. Causation in Risk Factors

• Not all risk factors directly cause diseases.

• Example: A high-fat diet and lack of exercise are linked to cardiovascular disease but do not directly cause it; they lead to high blood pressure and cholesterol, which are the direct causes.

5. Economic and Social Costs of Non-Communicable Diseases

• These diseases impact millions globally, reducing quality of life and life expectancy.

• Families are also affected by the need to care for loved ones with such diseases.

• Treatment is costly, and governments face high expenses for healthcare.