Immune System Support and Disease Prevention

There is no single symptom that confirms an immune deficiency. However, frequent or unusually persistent infections may warrant medical evaluation. Possible warning signs include recurrent respiratory infections, slow recovery from infections, severe or repeated infections, and infections that are unusually difficult to treat.

These symptoms can have several different causes, so taking immune supplements or medications without identifying the underlying cause is not recommended.

When immune function is impaired because of an underlying medical condition or certain treatments, the body may become more susceptible to infections such as respiratory infections, pneumonia, and certain bacterial, viral, or fungal infections.

Young children, older adults, people with chronic conditions, and individuals receiving treatments that affect immune function may also face a higher risk of complications from infections.
WHO identifies older adults and young children among the populations particularly vulnerable to the impact of infections and antimicrobial resistance.

Maintaining healthy immune function starts with an overall healthy lifestyle. Key measures include:

1. Eating a varied diet rich in vegetables, fruits, whole grains, and healthy sources of protein.
2. Getting sufficient, regular sleep.
3. Engaging in regular physical activity.

4. Maintaining a healthy weight and avoiding smoking.

1. Staying adequately hydrated.
2. Keeping recommended vaccinations up to date.
3. Washing hands regularly and limiting close contact with people who are sick.

NIH research indicates that deficiencies in nutrients such as vitamins A, C, D and E, zinc, and selenium can impair immune function. However, supplements generally do not prevent infections in people who already receive adequate amounts of these nutrients and do not have a deficiency.

Children and older adults should meet their nutritional needs primarily through a balanced diet, with assessment for specific deficiencies when necessary. Important nutrients for normal immune function include vitamin C, vitamin D, vitamin A, vitamin B6, vitamin B12, zinc, and selenium.

The appropriate intake varies according to age and individual health needs. High-dose vitamin supplementation should therefore not be given to children or older adults without medical advice.

To reduce the spread of colds and respiratory infections during winter, the MCC Clinic team recommends washing your hands regularly, covering your mouth and nose when coughing or sneezing, avoiding touching your eyes, nose, and mouth, limiting close contact with people who are sick, and maintaining good indoor ventilation.

Annual influenza vaccination is also an important preventive measure, particularly for people at higher risk of complications. Both WHO and CDC identify vaccination as one of the most important ways to prevent seasonal influenza and reduce its complications.