8 Ways to Boost Your Immunity

Eight habits do more for your immune system than any single product: eating a nutrient-rich diet, sleeping seven to nine hours, moving your body regularly, managing stress, staying hydrated, getting enough vitamin D, staying current on vaccines, and staying connected to people. None of them work overnight, and each one is backed by a source you can check.

Updated November 5, 2026.

Anyone who trains through winter learns that staying well is rarely luck. It comes down to whether you’re really sleeping, really eating real food instead of whatever’s fastest, and really taking a rest day instead of pushing through when you’re worn out. Most of us know the feeling of a busy week, a drive-through dinner and a plan to “eat better tomorrow.” The habits below are the ones that hold up when you look at what’s been studied.

Eat a Nutrient-Rich Diet

Banner Health recommends a diet full of vitamins, minerals and antioxidants. It names berries, leafy greens, citrus fruit, chicken, fish, beans and lentils, garlic, ginger, turmeric and yogurt as foods to include. No single food does the work. What counts is the overall pattern: lean protein, whole grains, nuts, seeds and plenty of colorful fruits and vegetables, plus minerals like magnesium that many people run short on. Think of the colors on your plate like a quick check. If everything is beige, there’s room to add something.

Get Seven to Nine Hours of Sleep

Banner Health says adults should get seven to nine hours of good, solid sleep and wake up no more than once a night. The practical steps are simple. Cut screen time an hour before bed, and keep the bedroom cool, dark and quiet. If your mind won’t slow down at night, a few simple wind-down tricks are worth a try.

Move Your Body to Boost Your Immunity

Aim for at least 150 minutes of moderate exercise a week, the number Banner Health gives. That’s about 30 minutes, five days a week, and it doesn’t have to be a gym session. Walking, cycling, swimming, dancing and hiking all count. Don’t overdo it, though. Too much exercise may weaken your immune function, so aim for steady, moderate work with real rest days. Most of us have gone hard for a week, burned out and quit. Slow and steady wins here.

Manage Stress

Chronic stress wears down your immune system, according to Banner Health, which points to exercise, yoga, meditation and deep breathing as ways to push back. Stress is usually easy to spot once you look. Your body reacts to it, and so does your mind. Small problems feel huge, simple tasks look hard, and your motivation drains away. If you can name what’s stressing you, get ahead of it. Try a meditation or breathing class, or sessions with a therapist. Here’s more on how chronic stress affects long-term health.

Stay Hydrated

Water plays a big part in how your body works. Your lymph system needs it to move immune cells around, and you lose water all day through sweat, exercise and normal bathroom trips. There’s no hard-and-fast rule for how much to drink, Banner Health notes, so keep a water bottle within reach and refill it. Anyone who’s filled a bottle in the morning and found it still full at dinner knows how easy it is to forget. That habit sticks better than counting ounces.

Get Enough Vitamin D

“Your immune system needs vitamin D to fight off invading bacteria and viruses,” according to the National Institutes of Health’s Office of Dietary Supplements. Adults 19 to 70 need 600 IU a day, and adults 71 and older need 800 IU. Fortified milk has about 120 IU per cup, and fatty fish such as trout, salmon, tuna and mackerel are good food sources. Talk to a doctor before adding a supplement.

Stay Current on Vaccinations

Banner Health lists flu, COVID-19, RSV, pertussis and measles as contagious or dangerous illnesses that vaccines help guard against. The right shots depend on your age and health history. This is the one habit on the list aimed at specific infections. Pair it with the everyday tips for not getting sick during flu season.

Stay Connected to Boost Your Immunity

It sounds odd on a list about immunity, but having a lifeline to other people matters for your health. About 1 in 3 U.S. adults report feeling lonely, according to the CDC. The CDC links social isolation and loneliness to a higher risk of heart disease and stroke, type 2 diabetes, depression and anxiety, dementia and earlier death. If you’ve ever put off calling a friend for weeks, you know how easily the people we like slip down the list. Whatever you can add to your social life, take it. A standing call, a class or a group you show up to all count.

No single habit here does the job alone. Start with sleep and diet, since both affect the other six, and add the rest as they fit your schedule. If stress or loneliness feels like more than you can handle, talk to a doctor or a counselor.

FAQ: How to Boost Your Immunity

Can supplements replace diet and sleep for immune support?

No. Supplements can fill a gap, but they don’t replace the basics. The NIH Office of Dietary Supplements says your immune system needs vitamin D, and food covers much of it: fortified milk, fatty fish and some fortified cereals. Ask a doctor whether you need a supplement before taking one.

How much exercise does the immune system need?

Banner Health recommends at least 150 minutes of moderate exercise a week, which works out to about 30 minutes, five days a week. Walking counts, and so do cycling and swimming. Steady, moderate work with rest days matters more than occasional all-out sessions.

Does loneliness affect physical health or just mood?

Both. The CDC links social isolation and loneliness to a higher risk of heart disease and stroke, type 2 diabetes, dementia and earlier death, as well as depression and anxiety. About 1 in 3 U.S. adults report feeling lonely, so it’s a common problem worth taking seriously.

How much vitamin D do adults need each day?

The NIH Office of Dietary Supplements recommends 600 IU a day for adults 19 to 70 and 800 IU a day for adults 71 and older. Fortified milk has about 120 IU per cup, and fatty fish like salmon, trout, tuna and mackerel are among the best food sources.

This article is for general information only and is not medical advice. Talk to a licensed clinician about your own situation.