1. Get enough sleep
Sleep and immunity are closely tied.
In fact, inadequate or poor quality sleep is linked to a higher susceptibility to sickness.
In a study in 164 healthy adults, those who slept fewer than 6 hours each night were more likely to catch a cold than those who slept 6 hours or more each night.
Getting adequate rest may strengthen your natural immunity. Also, you may sleep more when sick to allow your immune system to better fight the illness
2. Eat more whole plant foods
Whole plant foods like fruits, vegetables, nuts, seeds, and legumes are rich in nutrients and antioxidants that may give you an upper hand against harmful pathogens.
The antioxidants in these foods help decrease inflammation by combating unstable compounds called free radicals, which can cause inflammation when they build up in your body in high levels.
3. Eat more fermented foods or take a probiotic supplement
Fermented foods are rich in beneficial bacteria called probiotics, which populate your digestive tract (12Trusted Source).
These foods include yogurt, sauerkraut, kimchi, kefir, and natto.
Research suggests that a flourishing network of gut bacteria can help your immune cells differentiate between normal, healthy cells and harmful invader organisms.
In a 3-month study in 126 children, those who drank just 2.4 ounces (70 mL) of fermented milk daily had about 20% fewer childhood infectious diseases, compared with a control group
4. Manage your stress levels
Relieving stress and anxiety is key to immune health.
Long-term stress promotes inflammation, as well as imbalances in immune cell function.
In particular, prolonged psychological stress can suppress the immune response in children.
Activities that may help you manage your stress include meditation, exercise, and journaling