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immune booster against virus

How to boost your immune system to fight COVID-19

Several key healthy lifestyle habits can help keep your immune system working to stave off illness and infection.

You can make several lifestyle and dietary changes today to strengthen your immune system.

immune booster against virus

These include reducing your sugar intake, staying hydrated, working out regularly, getting adequate sleep, and managing your stress levels.

If you want to boost your immune health, you may wonder how to help your body fight off illnesses.

While bolstering your immunity is easier said than done, several dietary and lifestyle changes may strengthen your body’s natural defenses and help you fight harmful pathogens, or disease-causing organisms.

Tips to Keep Your Immune System Healthy

1. Get enough sleep

Inadequate sleep may increase your risk of getting sick. Most adults should get at least 7 hours of sleep per night.

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.

Adults should aim to get 7 or more hours of sleep each night, while teens need 8–10 hours and younger children and infants up to 14 hours

If you’re having trouble sleeping, try limiting screen time for an hour before bed, as the blue light emitted from your phone, TV, and computer may disrupt your circadian rhythm, or your body’s natural wake-sleep cycle

Other sleep hygiene tips include sleeping in a completely dark room or using a sleep mask, going to bed at the same time every night, and exercising regularly.

2. Cut down on smoking cigarettes

Like alcohol, cigarette smoking can also affect immune health. “Anything that’s a toxin can compromise your immune system,” Kaplan says.

In particular, the chemicals released by cigarette smoke — carbon monoxide, nicotine, nitrogen oxides, and cadmium — can interfere with growth and function of immune cells, like cytokines, T cells, and B cells, according to a November 2016 review in Oncotarget.

Smoking also worsens viral and bacterial infections (especially those of the lungs, like pneumonia, flu, and tuberculosis), post-surgical infections, and rheumatoid arthritis (an autoimmune disease in which the immune system attacks the joints), according to the CDC.

“Don’t smoke,” Lin says. And avoid secondhand smoke whenever possible.

If you currently smoke, there are many resources available to help you kick your habit, including counseling, nicotine replacement products, prescription non-nicotine medications, and behavioral therapy, according to the CDC.

3. Eat more healthy fats

Healthy fats like olive oil and omega-3s are highly anti-inflammatory. Since chronic inflammation can suppress your immune system, these fats may naturally combat illnesses.

Although low-level inflammation is a normal response to stress or injury, chronic inflammation can suppress your immune system.

Olive oil, which is highly anti-inflammatory, is linked to a decreased risk of chronic diseases like heart disease and type 2 diabetes. Plus, its anti-inflammatory properties may help your body fight off harmful disease-causing bacteria and viruses.

Omega-3 fatty acids, such as those in salmon and chia seeds, fight inflammation as well.

4. Limit added sugars

Added sugars contribute significantly to obesity, type 2 diabetes, and heart disease, all of which can suppress your immune system. Lowering your sugar intake may decrease inflammation and your risk of these conditions.

Emerging research suggests that added sugars and refined carbs may contribute disproportionately to overweight and obesity.

Obesity may likewise increase your risk of getting sick.

According to an observational study in around 1,000 people, people with obesity who were administered the flu vaccine were twice as likely to still get the flu than individuals without obesity who received the vaccine.

Curbing your sugar intake can decrease inflammation and aid weight loss, thus reducing your risk of chronic health conditions like type 2 diabetes and heart disease.

Given that obesity, type 2 diabetes, and heart disease can all weaken your immune system, limiting added sugars is an important part of an immune-boosting diet.

You should strive to limit your sugar intake to less than 5% of your daily calories. This equals about 2 tablespoons (25 grams) of sugar for someone on a 2,000-calorie diet.

5. Eat more fermented foods or take a probiotic supplement

Fermented foods are rich in beneficial bacteria called probiotics, which populate your digestive tract.

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.

If you don’t regularly eat fermented foods, probiotic supplements are another option.

In a 28-day study in 152 people infected with rhinovirus, those who supplemented with probiotic Bifidobacterium animalis had a stronger immune response and lower levels of the virus in their nasal mucus than a control group.

6. Engage in moderate exercise

Although prolonged intense exercise can suppress your immune system, moderate exercise can give it a boost.

Studies indicate that even a single session of moderate exercise can boost the effectiveness of vaccines in people with compromised immune systems.

What’s more, regular, moderate exercise may reduce inflammation and help your immune cells regenerate regularly.

Examples of moderate exercise include brisk walking, steady bicycling, jogging, swimming, and light hiking. Most people should aim for at least 150 minutes of moderate exercise per week.

7. Stay hydrated

Hydration doesn’t necessarily protect you from germs and viruses, but preventing dehydration is important to your overall health.

Dehydration can cause headaches and hinder your physical performance, focus, mood, digestion, and heart and kidney function. These complications can increase your susceptibility to illness.

To prevent dehydration, you should drink enough fluid daily to make your urine pale yellow. Water is recommended because it’s free of calories, additives, and sugar.

While tea and juice are also hydrating, it’s best to limit your intake of fruit juice and sweetened tea because of their high sugar contents.

As a general guideline, you should drink when you’re thirsty and stop when you’re no longer thirsty. You may need more fluids if you exercise intensely, work outside, or live in a hot climate.

It’s important to note that older adults begin to lose the urge to drink, as their bodies do not signal thirst adequately. Older adults need to drink regularly even if they do not feel thirsty.

8. Supplement wisely

It’s easy to turn to supplements if you hear claims about their ability to treat or prevent COVID-19.

However, these assertions are unfounded and untrue.

According to the National Institutes of Health (NIH), there’s no evidence to support the use of any supplement to prevent or treat COVID-19.

However, some studies indicate that the following supplements may strengthen your body’s general immune response:

  • Vitamin C. According to a review in over 11,000 people, taking 1,000–2,000 mg of vitamin C per day reduced the duration of colds by 8% in adults and 14% in children. Yet, supplementing did not prevent the cold to begin with.
  • Vitamin D. Vitamin D deficiency may increase your chances of getting sick, so supplementing may counteract this effect. Nonetheless, taking vitamin D when you already have adequate levels doesn’t seem to provide extra benefits.
  • Zinc. In a review in 575 people with the common cold, supplementing with more than 75 mg of zinc per day reduced the duration of the cold by 33%.
  • Echinacea. A study in over 700 people found that those who took echinacea recovered from colds slightly more quickly than those who received a placebo or no treatment, but the difference was insignificant.
  • Elderberry. One small review found that elderberry could reduce the symptoms of viral upper respiratory infections, but more research is needed.
  • Garlic. A high quality, 12-week study in 146 people found that supplementing with garlic reduced the incidence of the common cold by about 30%. However, more research is needed.

While these supplements demonstrated potential in the studies mentioned above, that doesn’t mean they’re effective against COVID-19.

Furthermore, supplements are prone to mislabeling because they aren’t regulated by the Food and Drug Administration (FDA).

Thus, you should only purchase supplements that have been independently tested by third-party organizations like United States Pharmacopeia (USP), NSF International, and ConsumerLab.

9. Practice alcohol intake moderation

Drinking high amounts of alcohol is associated with a range of negative health effects, including lowered immune function. When you drink high amounts of alcohol, your body is too busy trying to detoxify your system to bother with normal immune system function, Kaplan explains.

According to a review published in the journal Alcohol Research in 2015, high levels of alcohol consumption can weaken your body’s ability to fight infection and slow down your recovery time. As a result, people who drink high amounts of alcohol face a greater likelihood of pneumonia, acute respiratory distress syndrome, alcoholic liver disease, and certain cancers, according to the same review.

If you don’t already drink, don’t start. If you drink occasionally, limit your alcohol consumption to one drink (equivalent to a 4-ounce glass of wine) per day if you’re a woman, and two drinks per day if you’re a man, as recommended by the NIH.

10. 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, journaling, yoga, and other mindfulness practices. You may also benefit from seeing a licensed counselor or therapist, whether virtually or in person.

11. Keep symptoms of chronic conditions under control

Chronic conditions like asthma, heart disease, and diabetes can affect the immune system and increase risk of infections.

For example, when people with type 2 diabetes don’t manage their blood sugar properly, this can create a chronic, low-grade inflammatory response that weakens the body’s defense system, according to an October 2019 review in Current Diabetes Reviews.

Similarly, people with asthma are more susceptible to catching — and even dying from — the flu, and often experience worse flu and asthma symptoms as a result of the infection, according to a study published in the July 2017 issue of the Journal of Allergy and Clinical Immunology.

Living with a chronic condition can be like trying to drive a car that has only three tires, Kaplan says. “If you get sick with a virus, it’s going to take more effort for your body to recover,” he explains.

If you manage your chronic conditions better, you’ll free up more reserves to help your body fight off infection, Lin says. So be sure to stay on top of any medications, doctor visits, and healthy habits that keep your symptoms at bay. Your immune system will thank you.

12. 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 combatting unstable compounds called free radicals, which can cause inflammation when they build up in your body in high levels.

Chronic inflammation is linked to numerous health conditions, including heart disease, Alzheimer’s, and certain cancers.

Meanwhile, the fiber in plant foods feeds your gut microbiome, or the community of healthy bacteria in your gut. A robust gut microbiome can improve your immunity and help keep harmful pathogens from entering your body via your digestive tract..

Furthermore, fruits and vegetables are rich in nutrients like vitamin C, which may reduce the duration of the common cold.

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