Three Layers of Defense
Immune System 101
The immune system has three main layers of defense: the physical barrier (skin and mucus lining), the innate immune system, and the adaptive immune system. The physical barrier acts as a filter, trapping bacteria and viruses, while the innate immune system provides a rapid response to infection. The adaptive immune system generates antibodies to recognize specific invaders.
- The physical barrier is the first line of defense against infection.
- The innate immune system provides a rapid response to infection.
- The adaptive immune system generates antibodies to recognize specific invaders.
- Maintain a Healthy Physical BarrierKeep the mucus lining in good shape by maintaining a healthy microbiome and avoiding touching your eyes after touching other people or surfaces.Pro tipNasal breathing is a better filter for viruses and bacteria than mouth breathing.WarningNot maintaining a healthy physical barrier can lead to increased risk of infection.
- Support the Innate Immune SystemConsume fermented foods, such as sauerkraut and kimchi, to enhance the proliferation of good gut microbiota.Pro tipLow sugar fermented foods are more effective.WarningA weakened innate immune system can lead to increased risk of infection.
- Understand Sickness BehaviorRecognize the signs of sickness behavior, such as lethargy, loss of appetite, and photophobia, and understand that it is a motivated state designed to help the body recover from infection.Pro tipThe vagus nerve plays a key role in signaling the brain to engage sickness behavior.WarningIgnoring sickness behavior can lead to prolonged illness and increased risk of complications.
A person who practices nasal breathing is less likely to get infected with a virus than someone who breathes through their mouth.
A person who consumes fermented foods regularly has a stronger innate immune system and is less likely to get sick.
The concept of the three layers of defense is based on the understanding of how the immune system functions to protect the body against infections and diseases.