What are some things that can make a person valnerable to illness?

* Age: The risk of illness increases with age. This is because the immune system weakens as we get older, making us more susceptible to infection.

* Genetics: Some people are more likely to get sick than others due to their genes. This is because genes control how our immune system works.

* Stress: Stress can take a toll on the immune system, making us more likely to get sick. This is because stress hormones can suppress the immune system's ability to fight off infection.

* Poor nutrition: A diet that is lacking in nutrients can weaken the immune system, making us more vulnerable to illness. This is because nutrients are essential for the proper functioning of the immune system.

* Lack of sleep: Sleep is essential for the immune system to function properly. When we don't get enough sleep, our immune system is less able to fight off infection.

* Chronic health conditions: People with chronic health conditions, such as heart disease, diabetes, and cancer, are more likely to get sick. This is because these conditions can weaken the immune system, making it more difficult to fight off infection.

* Medications: Some medications, such as chemotherapy drugs and corticosteroids, can suppress the immune system. This can make people more vulnerable to illness.

* Environmental factors: Exposure to pollutants, such as smoke and chemicals, can damage the immune system. This can make people more likely to get sick.