If you're showing symptoms of an illness, it's a strong indicator that you're contagious. Symptoms like coughing, sneezing, or a runny nose are not just signs of your body fighting the infection; they also mean you're likely to spread the germs to others. These symptoms often involve the release of airborne particles or bodily fluids that can carry the virus or bacteria, making it easier to transmit the illness to those around you. Therefore, when experiencing such symptoms, it's important to take precautions to prevent spreading the infection to others.

You Are Contagious If You Have Symptoms 

Short Bursts of Exercise Boost Immunity, While Marathon-Like Exertion Can Weaken It.Moderate to high-intensity exercise, lasting about 60 minutes or less, can be highly beneficial for the innate immune system. This duration and intensity of physical activity help to stimulate and strengthen the body's defense against pathogens. However, it's important to note that prolonged, intense exercise, such as running a marathon, may have the opposite effect. Extended physical exertion can lead to a temporary decrease in immune system efficiency making the body more susceptible for infections.

Taking three 15-minute sauna sessions can significantly improve your innate immune system. The heat from the sauna stimulates the body's immune response, enhancing the activity of white blood cells and increasing production of heat shock proteins, which play a crucial role in immune system regulation. These short, repeated exposures to high heat not only help in stress relief and relaxation but also bolster the body's first line of defense against pathogens, thereby supporting overall immune health. Regular sauna use, therefore, can be a valuable addition to a healthy lifestyle.

Triple 15-Minute Sauna Sessions: A Warm Boost for Your Innate Immune System

To support your gut microbiome, consider a simple routine of swishing and swallowing a small amount of water before sleeping and immediately after waking up, but prior to brushing your teeth. This practice helps in transferring the beneficial oral bacteria to your gut. The oral microbiome, containing a diverse range of bacteria, plays a role in overall health, and transferring these microbes to the gut can aid in maintaining a balanced gut microbiome. This balance is crucial for digestion, immunity, and overall well-being.

Swish and Swallow Water Before Sleep and Pre-Brushing to Boost Gut Microbiome Health

The adaptive immune system is highly specialized and tailored to recognize specific pathogens. Unlike the innate immune system, which responds immediately but generally to threats, the adaptive system remembers past invaders and prepares the body for stronger and quicker responses to future attacks. It involves specialized cells like T-cells and B-cells. B-cells produce antibodies that target specific pathogens, while T-cells destroy infected cells and help coordinate the immune response. This system's ability to adapt and remember makes it crucial for long-term immunity.

Adaptive Immune System: Tailored Defense with Memory for Long-Term Immunity

Contrary to common belief, the flu is not directly caused by cold weather. It's actually the influenza virus that's responsible. Cold, dry conditions in winter aid the spread of the virus, as people gather indoors, increasing the likelihood of transmission. While cold weather can weaken immune defenses, making us more susceptible, it's the virus, not the temperature, that leads to flu.

The flu is not caused by cold weather

The common cold virus is often transmitted when a person touches surfaces contaminated with the virus and then touches their eye area. This contact allows the virus to enter the body through the mucous membranes in the eyes, leading to infection. Regular hand washing and avoiding touching the face, especially the eyes, can significantly reduce the risk of contracting the common cold.

Avoid Touching Your Eyes to Prevent Infection

The primary pathways for viruses to enter the body are through the eyes and mouth, where protective barriers are less robust compared to other entry points. In contrast, areas like the nose and anus are fortified with mucous membranes and host beneficial bacteria, which form a defensive line against pathogens. The mucus acts as a trap for invading organisms, while the healthy bacteria present compete with harmful microbes, reducing the likelihood of infection. This distinction highlights the importance of protecting the eyes and mouth from exposure to viruses.

Eyes & Mouth Is The Weakest Part

When a virus enters the body, it's quickly detected as a foreign invader. The immune system responds by tagging these viral cells with an "eat me" signal. This signal alerts the body's defense cells to identify and destroy the invaders. White blood cells, such as macrophages, then engulf and digest these marked cells, effectively eliminating them. This process is a crucial part of the body's innate defense mechanism against viral infections, helping to prevent the spread of the virus within the body and aiding in the overall immune response.

What Happens When a Virus Enters Your Body?

The human skin acts as the largest barrier against infections, serving as a primary line of defense. Additionally, the eyes, being an extension of the brain, are equipped with their own protective mechanisms. They contain antibacterial chemicals that actively combat invading pathogens. The yellowish discharge often found in the corners of the eyes upon waking. This material is actually the residue left behind after these antibacterial agents have engaged with harmful microorganisms during sleep, essentially the aftermath of a microscopic battle waged to protect your eyes from infection.

Skin Is Your Ultimate Protection Against Infections

The innate immune system is the body's initial line of defense against pathogens, offering a rapid, generalized response to foreign invaders. Unlike the adaptive immune system, which learns and remembers specific pathogens, the innate system responds immediately to a wide range of threats. It includes physical barriers like skin and mucous membranes, as well as various immune cells such as macrophages and neutrophils that identify and eliminate pathogens. This system's non-specific, quick-action approach is crucial for early protection.

Innate Immune System: The Body's Immediate, Generalized Line of Defense

Andrew Huberman's latest podcast explores effective immune-boosting strategies against colds and flu, debunking myths and evaluating remedies like vitamins and exercise, while emphasizing overall immune health.

In this episode, I explain the biology of the common cold and flu (influenza) and how the immune system combats these infections. I describe behavior, nutrition and supplementation-based tools supported by peer-reviewed research to enhance immune system function and better combat colds and flu. I also dispel common myths about how the cold and flu are transmitted and when you and those around you are contagious. I explain if common preventatives and treatments such as vitamin C, zinc, vitamin D and echinacea work. I also highlight other compounds known to reduce contracting and duration of colds and flu.  I discuss how to use exercise and sauna to bolster the immune response. This episode will help listeners understand how to reduce the chances of catching a cold or flu and help people recover more quickly from and prevent the spread of colds and flu. For show notes, including referenced articles and additional resources, please visit hubermanlab.com. Thank you to our sponsors AG1: https://drinkag1.com/huberman Joovv: https://joovv.com/huberman Helix Sleep: https://helixsleep.com/huberman ROKA: https://roka.com/huberman InsideTracker: https://insidetracker.com/huberman Momentous: https://livemomentous.com/huberman Timestamps (00:00:00) Avoid Colds & Flu (00:01:58) Sponsors: Joovv, Helix Sleep & ROKA (00:06:00) Common Cold: Source & Transmission; Cold Temperature Myth (00:13:48) Spreading a Cold; Symptoms & Contagious Myths (00:17:43) Flu Virus & Transmission; Flu Shots (00:23:56) Tools: Injections & Safety; Charting Health Trends & Sickness (00:27:16) Sponsor: AG1 (00:28:44) Spreading Cold & Flu, Symptoms (00:30:43) Immune System, Physical Barriers (00:39:33) Tool: Social Connection & Touch, Avoiding Flu & Cold (00:45:14) Innate Immune System (00:53:13) Sponsor: InsideTracker (00:54:15) Adaptive Immune System; Lymphatic System (01:00:19) Tools: Enhance Innate Immune System (01:06:19) Tool: Microbiome & Nasal Breathing (01:10:58) Tools: Enhance Gut Microbiome: Foods & Water Protocol (01:16:13) Exercise When Feeling Sick?, Sleep (01:21:39) Tool: Exercise & Preventing Sickness (01:28:13) Exercise When Sleep Deprived? (01:32:24) Tool: Exercise Recovery & Carbohydrates (01:34:52) Tool: Sauna & Enhance Immune System (01:42:20) Supplements: Vitamin C, Vitamin D (01:50:58) Echinacea, Zinc (01:55:08) N-acetylcysteine (NAC), Decongestants (02:03:42) Zero-Cost Support, Spotify & Apple Reviews, YouTube Feedback, Sponsors, Momentous, Social Media, Neural Network Newsletter Title Card Photo Credit: Mike Blabac Disclaimer

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Huberman Lab discusses neuroscience: how our brain and its connections with the organs of our body control our perceptions, our behaviors, and our health. We also discuss existing and emerging tools for measuring and changing how our nervous system works. Dr. Andrew Huberman is a tenured professor of neurobiology and ophthalmology at Stanford School of Medicine. His laboratory studies neural regeneration, neuroplasticity, and brain states such as stress, focus, fear, and optimal performance. For more than 20 years, Dr. Huberman has consistently published original research findings and review articles in top-level peer-reviewed journals, including Nature, Science, Cell, Neuron, and Current Biology. He is a regular member of several National Institutes of Health review panels and a Fellow of the McKnight Foundation and the Pew Charitable Trusts. Dr. Huberman regularly consults for technology development companies, professional athletic organizations, and various units of U.S. and Canadian Special Operations.