Eating for Immune Health

It’s that time of year when people are often under the weather, and our attention turns to staying healthy. Most immune work happens quietly - at the table, not at the pharmacy. Your immune system relies on steady energy, key nutrients, and metabolic balance to function well. Food supplies the raw materials your immune system uses every day to respond, repair, and recover.

Functional foods are whole foods that provide naturally occurring compounds—vitamins, minerals, fibers, healthy fats, and plant compounds—that help support immune balance and resilience.

Here are a few evidence-backed categories of functional foods to support immune health.

Fermented Foods

A large portion of the immune system lives in the gut, making digestive health central to immune regulation. Fermented foods like yogurt, kefir, sauerkraut, kimchi, and miso help support a diverse gut microbiome and a strong intestinal barrier.

Regular consumption has been linked to lower inflammation and more balanced immune responses—key for protecting against pathogens without overreacting.

Allium Vegetables

Garlic, onions, leeks, and shallots contain sulfur compounds that support immune cell activity and healthy inflammatory signaling.

Garlic in particular is associated with enhanced function of immune cells involved in early defense. While raw garlic is most potent, cooked garlic still provides meaningful benefits.

Colorful Fruits & Vegetables

Berries, citrus, leafy greens, cruciferous vegetables, and herbs provide polyphenols that help regulate inflammation and oxidative stress.

They also nourish beneficial gut microbes, reinforcing the connection between plant diversity and immune resilience.

Omega-3 Fatty Acids

Fatty fish such as salmon, sardines, and mackerel provide omega-3 fats that support healthy immune signaling.

These fats help resolve inflammation after an immune response, supporting recovery and long-term immune health.

Mushrooms  

Mushrooms like shiitake, maitake, and reishi contain beta-glucans, fibers that interact directly with immune cells.

Research suggests they support immune surveillance and may help reduce susceptibility to common infections, particularly during stress.

Micronutrient-Dense Whole Foods

Whole foods provide essential nutrients—zinc, selenium, iron, vitamins A, C, D, E, and B6—in natural combinations the body absorbs efficiently.

These nutrients support immune cell development, antibody production, and regulation of inflammatory responses.

Putting It Together

Supporting immune health is about consistent patterns—meals built around whole, minimally processed foods that provide microbial support, key nutrients, and metabolic stability.

And let’s not forget that quality sleep, regular movement, and stress management strategies are also essential to supporting our immune health.

References

Wastyk HC, Fragiadakis GK, Perelman D, et al. Gut-microbiota-targeted diets modulate human immune status. Cell. 2021;184(16):4137-4153.e14. doi:10.1016/j.cell.2021.06.019

Calder PC. Feeding the immune system. Proc Nutr Soc. 2013;72(3):299–309. Wastyk HC et al. Gut-microbiota-targeted diets modulate human immune status. Cell. 2021;184(16):4137–4153.

Arreola R, Quintero-Fabián S, López-Roa RI, et al. Immunomodulation and anti-inflammatory effects of garlic compounds. J Immunol Res. 2015;2015:401630. doi:10.1155/2015/401630