9 Everyday Habits That May Be Sabotaging Your Immune System

Your Immune System

Your immune system protects your body against infection, illness, and disease. However, many lifestyle factors contribute to how well it works over time. Some habits, like lack of sleep and a diet high in processed foods, can wreak havoc on or weaken your immune system over time.1 Here are nine everyday habits that may be sabotaging your immune system, along with how you can best support it.

1. Staying Indoors Too Often

If you work indoors or stay inside for most of the day, you’re missing out on the immune-boosting benefits of light exposure. Daily exposure to sunlight is important for vitamin D production, which is essential for immune system regulation.

Additionally, daily light exposure helps regulate the body’s circadian rhythm, your internal 24-hour clock that regulates the sleep-wake cycle. This supports your immune system health and helps regulate inflammation in the body.

2. Not Managing Stress

Feeling stressed on occasion is normal, but chronic stress can significantly impact your immune system.6 Stress can be managed, but if it’s left unchecked, studies show it can increase your chances of illness.

To better cope with stress, science shows that healthy habits such as meditation, journaling, and outdoor walks can help.

3. Eating Late at Night

Eating too late in the evening (after 9 p.m., or within two to three hours before bedtime) can disrupt your metabolism and lead to circadian misalignment, which negatively impacts inflammation, hormonal rhythm, and immune system cells.

To keep everything in check, eat dinner earlier to better support your immune system and metabolic health.

4. Not Drinking Enough Water

Hydration is key to immune system support. Studies show that dehydration can impair immunity and delay recovery from illness.10

To ensure you’re drinking enough water, experts recommend at least 9 cups (72 ounces) per day for women and 13 cups (104 ounces) per day for men.

5. Eating in a Calorie-Deficit

If you’re eating in a calorie-deficit to lose weight, research shows that limiting calories too much (a 40% reduction) is associated with impaired immune function.

When eating fewer calories, it’s also important to consume nutrient-rich foods that can support your immune system. For example: vitamin C, such as citrus fruits, berries, and kale.

6. Not Socializing Enough

Research shows that socializing helps with healthy aging and longevity. Loneliness can impact your emotional well-being, and it’s also associated with inflammatory immune responses that can increase your risk of heart disease.

To support your immune system, plan regular time with friends and family, or volunteer in your local community to meet other like-minded people.

7. Eating Processed Foods

Studies show that ultra-processed foods can increase inflammation and immune dysregulation, which increases the risk of inflammatory bowel disease (IBD) and autoimmune diseases.

To mitigate your risk, eliminate or reduce intake of ultra-processed foods and opt for whole foods whenever possible.

8. Worrying

Excessive worrying thoughts may indicate an anxiety disorder. Research has found that anxiety can disrupt how the body regulates the immune system, and it can also impact inflammatory activity and neurotransmitter balance in the body.

Having a deregulated immune system can increase your risk of chronic diseases. If you are experiencing worrying thoughts that are affecting your ability to function daily, see a healthcare provider for diagnosis and treatment.

9. Overtraining

While regular exercise is key for supporting a healthy immune system, excessive exercise (overtraining) can negatively impact immune function.

To better regulate the immune system, support immune function, and boost overall health, researchers recommend implementing balanced training sessions with ample recovery time.