Fruits that boost your immune system are packed with Vitamin C (citrus, kiwi, strawberries), antioxidants (blueberries, pomegranate, mango), and beta-carotene (papaya), all crucial for increasing infection-fighting white blood cells, reducing inflammation, and protecting cells from damage, with colorful options like red bell peppers (even more Vitamin C than oranges!) also being top contenders for strong immunity.
Most citrus fruits such as oranges, grapefruits, tangerines, lemons, and limes contain high levels of vitamin C, which is thought to help fight infection by increasing your white blood cells. Whether you eat them whole, or squeeze the juice onto your food, don't forget to add these tangy fruits to your regular diet.
These include citrus fruits, berries, leafy greens, garlic, ginger, yogurt, nuts, and seeds which offer unique benefits, from providing an array of bioactive compounds to boost human immunity.
“Bananas are rich in important nutrients and antioxidants,” says Rottinger. “Including them regularly in a healthy diet is one of the best ways to reduce inflammation and support your immune system.”
Serve healthy foods
One of the best ways to boost immunity and strengthen your white blood cells is to eat a balanced diet. For children ages 5 to 18, this means: Lots of fruits and veggies: Experts recommend children eat at least five servings of fruits and vegetables every day.
Five signs of a weak immune system include frequent infections, slow-healing wounds, persistent fatigue, ongoing digestive issues, and getting sick with things that last a long time, like a cold that lingers or severe infections requiring strong treatment. These indicate your body struggles to fight off pathogens or repair itself effectively.
Your child's immune system can be temporarily weakened by certain drugs, such as chemotherapy or other drugs used to treat cancer, or medication to prevent organ rejection following transplant. Also, infections like the flu virus, mononucleosis (mono) and measles can weaken the immune system for a brief time.
Antiviral herbs such as oregano, tulsi, fennel, peppermint, pokeweed, black nightshade, and aloe vera boost defense and may be used to treat respiratory diseases such as mucus congestion, which can be a breeding ground for germs and viruses.
- Citrus Fruits (Oranges, Grapefruits, Lemons)
Citrus fruits are a powerhouse when it comes to fighting off coughs and colds. Oranges, grapefruits, and lemons pack a punch with their high vitamin C content. This essential nutrient is known for boosting the immune system and helping your body fend off infections.
Also, infections like the flu virus, mono (mononucleosis), and measles can weaken the immune system for a brief time. Your immune system can also be weakened by smoking, alcohol, and poor nutrition.
Ginger is a great source of vital vitamins and minerals, including iron, magnesium, vitamins B6 and C, and zinc. These vitamins and minerals along with ginger's antioxidant properties can help strengthen your immune system. Gingerol helps ease common cold symptoms, like muscle fatigue and sore throat.
Harvard Health Publishing's 6-Week Plan for Healthy Eating
Foods loaded with vitamin C, vitamin A, antioxidants, and zinc are particularly beneficial in promoting WBC production. Seek fruits like oranges and kiwifruits, vegetables like carrots and spinach, and other wholesome foods like garlic and almonds to amplify your diet's immune-boosting potential.
On the flip side are beverages and foods that reduce inflammation, and with it, chronic disease, says Dr. Hu. He notes in particular fruits and vegetables such as blueberries, apples, and leafy greens that are high in natural antioxidants and polyphenols — protective compounds found in plants.
See six tips below.
Fresh fruit has important vitamins and minerals your body needs when you're sick. Apples, bananas and pomegranates are all good choices. Eat citrus if it sounds good but be careful if you are nauseous or have a sore throat; too much of these high-acidity fruits may make you feel worse.
So load up on vitamin C-rich foods like oranges, grapefruits, lemons, limes, strawberries, tomatoes, and broccoli.
Avoid greasy, fatty, spicy or strong smelling foods as they may make you feel worse. Have plain, bland foods such as potatoes, pasta or rice with plain chicken, fish, or cold cuts of meat, and try milky puddings, ice lollies or ice-creams. Salty foods like crisps, salted biscuits, cheese or soup may be easier to eat.
Another early-acting immune defence mechanism involves a type of white blood cells called Natural Killer cells (NK cells) – a group of lymphocytes that have the innate ability to recognise virally-infected cells and cause them to die so that the virus can no longer replicate.
A peanut butter and jelly sandwich (PB&J) adds about 33 minutes to your healthy lifespan per serving, according to a University of Michigan study that measured life expectancy impacts of over 5,850 foods using the Health Nutritional Index (HNI). This sandwich tops the list for adding time, with nuts and seeds also being highly beneficial (around 25 mins) and processed items like hot dogs subtracting time.
The resilience built in youth gradually depletes until around 50 years of age, when the risk of infection and more serious outcomes starts to become more and more obvious.
Nourishing Your Child's Body: The Power of Diet
Berries: Blueberries, strawberries, and raspberries are rich in antioxidants and vitamin C, which support the immune system. Leafy greens: Spinach, kale, and broccoli are loaded with vitamins A, C, and E, as well as antioxidants that help protect cells from free radicals.
Yes, it's widely accepted in health and science that a vast majority, often cited as around 70% or more (even 70-80%), of your immune system resides in your gut, specifically in the gut-associated lymphoid tissue (GALT), making gut health crucial for overall immune function as it's where the body constantly interacts with food, microbes, and potential pathogens.