Final answer:
Cancer and diabetes both have hereditary components, but many cases stem from lifestyle and environmental factors. Genetic testing can reveal a person's risk, but prevention often includes making healthy lifestyle choices.
Step-by-step explanation:
The statement "Cancer and diabetes are two common hereditary diseases" can be considered true to an extent. While both conditions can have hereditary components, they are also influenced by lifestyle choices and environmental factors. For instance, certain types of cancer such as breast and ovarian cancer can be caused by inherited mutations in the genes BRCA1 and BRCA2. Additionally, having a family history of type 1 or type 2 diabetes does increase the risk of developing the disease. However, type 2 diabetes is also highly associated with lifestyle factors like diet and exercise.
It is important to note that not all cancers or cases of diabetes are hereditary. Many noninfectious chronic diseases including heart disease, stroke, and some forms of diabetes can largely be prevented through healthy lifestyle choices. Regular screening examinations and lifestyle modifications can help reduce the risk of developing these diseases, particularly for those with a family history.