Today's Tuesday • 8 mins read
You know this popular catchphrase: “A healthy life is a happy life.” Let’s turn that around: “A happy life is a healthy life.”
Both are true. There is a two-way connection between health and happiness. Pursuing activities that bring joy can act as a hidden boost for your health. Conversely, prolonged sadness can negatively affect physical health, increasing the risk of conditions like heart disease and diabetes.
Interestingly, scientists revealed links between happiness and immune function. Your immune system plays a crucial role in defending against germs like bacteria and diseases like cancer.
Your emotions do more than influence your mood; they can also impact your immune system. So how can you boost your happiness to strengthen your immunity?
How Emotions Reach Your Immune System
Research indicates that the brain and immune system are in constant communication. Your immune system responds to your emotions, and your feelings can send signals that can augment or weaken your body’s natural defenses.
By the way, your immune system is a complex defense system, with three lines of defense:
- Innate Immunity: first line, present at birth, acts as a rapid response team.
- Adaptive Immunity: second line, develops over time, triggered by vaccines, forms our immune system’s memory.
- Passive Immunity: third line, temporary shield, borrowed from a source, like the immunity that babies get from their mothers’ milk and placenta.
These are 5 ways to build stronger immunity by focusing on your happiness and well-being:
1. Have More Positive Emotions
Humor and laughter have been linked to higher salivary IgA, an antibody that helps protect the body from infections. Positive emotions trigger biological changes that boost your body’s ability to fight illness.
- This study found that salivary IgA (Immunoglobulin A) levels increased considerably after participants were shown a hilarious video, but not after they watched an educational video.
- Researchers from the Center for Advancement of Health found that energetic, happy, and relaxed people are less likely to catch colds. While depressed, nervous, or angry people are more likely to complain about cold symptoms, whether or not they picked up the cold virus.
- This study at Carnegie Mellon University found happy students were three times less likely to catch a cold. Some students had their happiness levels boosted before being exposed to a cold virus. These students were found to be less likely to catch the cold virus, and those who did catch it had milder symptoms compared to the students who did not receive the happiness boost.
Practical steps: Make space for some positive emotions in everyday life. Watch or share something genuinely funny.
Do activities that leave you feeling energetic, relaxed, or happy, such as watching a comedy, listening to uplifting music, spending time with supportive people, moving your body, or taking health breaks that you enjoy.
Small, regular moments of enjoyment help your body cope better with everyday stress and illness. Seek help if you frequently feel stress, anger, or low mood.
Add some laughs to your day.
2. Build A Positive Outlook
A positive and optimistic outlook can improve your immunity. Researchers see optimism as a buffer against stress-related changes in the immune system.
- People with a positive outlook, despite a family history of heart disease, were one-third less likely to have an adverse heart-related event within 5 to 25 years than those with a negative outlook (Lisa R. Yanek, Johns Hopkins Medicine). So, there is a link between a positive outlook and better protection against the inflammation caused by stress.
- This study suggests that optimism can protect against stress-related immune changes when people do not face major goal conflict, though it may have short-term immune costs when they keep pursuing conflicting goals.
- Optimists tend to live 11-15% longer than pessimists. They also tend to live longer, having a greater chance of achieving “exceptional longevity” of 85+ years.
Practical steps: Build an optimistic outlook by replacing thoughts like “I will fail” with more realistic and hopeful ones, such as, “This is challenging, but I can prepare, learn, and improve.”
Focus on the one next step you can control rather than trying to manage everything at once. Notice what went well each day and keep a journal of small successes. See setbacks as information about what needs to change, not as proof that you are incapable.
Finally, keep supportive people close, as encouragement and connection can make it easier to stay hopeful during stressful times.
The glass-half-full people look for the silver lining in dark clouds.
3. Nurture Your Close Relationships
Marital quality is linked to a couple’s immunity. Ongoing marital stress may weaken the body’s immune response over time, while supportive, respectful relationships can benefit both partners’ emotional and physical health.
- A 2013 study found that unhappy marriages can weaken the immune system over time, with distressed spouses having worse immune function than those in happy marriages.
- Dr. Anna Phillips’ research showed that losing a loved one in the past year is linked to a weaker response to the flu vaccine. And people in happy marriages are better protected against the flu.
- The Gottman Institute found that showing contempt (predictably the most destructive behavior to cause breakups in couples) towards a partner can harm their ability to fight off viruses and cancers.
- Greta Hysi’s research found that higher levels of negativity in marriages, which contribute to marital dissatisfaction, directly harm a couple’s physical health.
Practical steps: Keep disagreements focused on the issue and away from attacks on your partner’s character. Try to reduce negative patterns such as frequent criticism, hostility, and especially contempt.
Communicate each other’s concerns calmly, listen to your partner’s perspective, and make room for appreciation, affection, and repair after disagreements.
If grief or relationship difficulties feel overwhelming, seek support from trusted people or a professional to help reduce stress and promote overall well-being.
Having friends is an important predictor of happiness and life satisfaction (Demir & Orthel-Clark, 2015).
4. Manage Stress, Anxiety, and Low Mood
Stress and anxiety can reduce our body’s natural immune defenses.
- In 1993, Kiecolt-Glaser and Glaser found that medical students’ immunity weakened during the stress of exams, resulting in fewer NK cells, reduced gamma-interferons, and low T-cell counts.
- In 2002, Layne McGuire, Kiecolt-Glaser, and Glaser discovered that even mild, long-term depression can weaken the immune system.
- In 2004, Suzanne Segerstrom found that stress lasting from days to months can significantly weaken the immune system in older people.
- In 2005, Sarah Pressman and Sheldon Cohen reported that social isolation and loneliness reduced the immunity of students at CMU in Pittsburgh, Pennsylvania.
Practical steps: The idea is to manage your stress in a healthy way, not avoid it. Build small calming habits into your day, such as regular sleep, gentle exercise, slow breathing, time outdoors, or short breaks away from work and screens.
Staying socially connected also matters: regular conversations, shared activities, and reaching out when you feel isolated can reduce loneliness and help you cope better during demanding periods. Reach out to a friend when loneliness builds.
If stress lasts for weeks or begins to affect your mood, energy, or daily routine, talk with someone you trust or seek professional support rather than trying to carry it alone.
Not every problem has a solution. Learn to let go.
5. Practice Compassion
Studies link kindness and compassion to higher levels of protective antibodies. Practicing kindness and compassion can be a simple way to strengthen the body’s natural defenses.
- In one study, volunteers who watched a video of Mother Teresa performing acts of kindness and compassion had significant increases in their protective antibody (IgA) levels.
- In another study, volunteers who were asked to feel care and compassion for 5 minutes had IgA levels that rose by roughly 50%.
Practical steps: Make small acts of care part of your day, such as helping someone, checking in on a friend, offering encouragement, or taking a few quiet minutes to think warmly about another person.
You can also direct compassion toward yourself when you are struggling, rather than responding with harsh self-criticism. These moments of genuine care may help reduce stress and promote positive emotional states that are linked to healthier immune functioning.
Build compassion into a routine, such as a monthly volunteer shift or a five-minute daily practice of focusing on care for someone you know. Do a random act of kindness without expecting anything in return.
There is no sense in punishing your future for the mistakes of your past.
Final Words
We may safely suggest there is a positive relationship between the body’s immunity and our happiness.
- People are happier when they are in good health and not dealing with illnesses.
- To prevent illnesses and recover fast, we rely significantly on our immune system.
- When our immune system is working well, we have a better chance of being happier.
√ Also Read: 10 Ways To Be Happy: Tips From Happiness Science
√ Please share this with someone.
» You deserve happiness! Choosing therapy could be your best decision.
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