Question

noninfectious diseases
noninfectious diseases are not contagious. they result from a variety of factors, including genetics, aging, poor diet, and environmental influences.
some diseases are passed from parent to child through genes that carry the genetic code for the specific disease. some of these diseases are noticeable at birth, but others may not be discovered until later in life. muscular dystrophy and cystic fibrosis are examples of genetic diseases. sometimes genetics may simply make a person susceptible to getting a particular disease. the occurrence of heart disease in a persons family, for example, is a good indication that certain genes will make that person susceptible to heart disease. however, that person can minimize the risk through a healthy lifestyle which includes a nutritious diet, adequate exercise, and not smoking.
some noninfectious diseases result from the deterioration of tissues and organs that occurs as a person ages. one type of arthritis which affects older adults is caused by the deterioration of joints, especially the knee, hip, and finger joints.
a poor diet can result in a number of diseases. in many undeveloped countries, people suffer from malnutrition because they cannot get enough to eat. lack of vitamins can cause diseases such as rickets and scurvy. in the united states, obesity is a condition which typically results from people eating too much \junk\ food. obesity can contribute to heart disease and diabetes mellitus.
exposure to certain environmental factors can also cause various diseases. for example, a person exposed to radiation, specific chemicals, and tobacco smoke, would be more likely to develop cancer or heart disease.
although there are no cures for most noninfectious diseases, certain behaviors can make living with these illnesses easier. taking proper medication, eating a well - balanced diet, exercising, and controlling stress can contribute to a healthier life.

1. how are infectious and noninfectious diseases different?
2. will a person definitely develop heart disease if there is a history of the disease in his or her family? explain.
3. describe the relationship between diet and disease.

Explanation:

The answers are based on the information provided in the text about non - infectious diseases, including their differences from infectious diseases, the role of genetics and lifestyle in disease development, and the impact of diet on health.

Answer:

1. Infectious diseases are contagious, while non - infectious diseases are not. Non - infectious diseases result from factors like genetics, aging, poor diet, and environmental influences.
2. No. Although a family history of heart disease indicates that certain genes may make a person susceptible, the person can minimize the risk through a healthy lifestyle, including a nutritious diet, adequate exercise, and not smoking.
3. A poor diet can lead to many diseases. In undeveloped countries, malnutrition due to lack of food can occur. Lack of vitamins causes diseases like rickets and scurvy. In the US, over - eating "junk" food can lead to obesity, which can contribute to heart disease and diabetes mellitus.