Every year around this time, the same question comes up.
How do you actually support your immune system when the colder months hit?
By 2026, most people already understand the basics. Sleep matters. Stress plays a role. Hygiene helps. But diet is still one of the most consistent ways to support how your body responds day to day.
Not in a quick-fix way, and not in a “one superfood solves everything” way, but through small, consistent choices.
“A lot of people look for one thing to boost their immune system,” says Madeline Calfas, nutritionist and registered nurse. “But it really comes down to giving your body the nutrients it needs to function properly over time.”
Here are a few foods that are worth keeping in regular rotation.
Kiwi fruit
It’s simple, but effective.
Kiwi fruit is naturally high in vitamin C, which plays a role in supporting how your immune system responds to stress, illness, and everyday exposure.
“Vitamin C supports the function of immune cells and helps the body respond more effectively,” Madeline explains. “It’s not about mega-dosing, it’s about consistent intake.”
It’s also easy to include. Add it to breakfast, slice it into yoghurt, or just keep it on hand as a quick snack.
Turmeric
Turmeric has been used for years, but it’s still relevant for a reason.
The active compound, curcumin, is known for its anti-inflammatory properties, which can support how the body responds when it’s under pressure.
“When inflammation is high, the immune system doesn’t work as efficiently,” says Madeline. “Supporting that balance can make a difference.”
It doesn’t need to be complicated. Add it to soups, rice, or warm drinks. Even small amounts used regularly can be beneficial.
Green tea
Green tea is one of those habits that adds up over time.
It contains antioxidants that help protect cells from everyday stress and support overall immune function.
“It’s a simple addition that fits easily into a routine,” Madeline says. “You’re supporting your body without having to think too much about it.”
Swapping one coffee for green tea during the day is often enough to start.
Shellfish (for zinc)
Zinc plays a key role in how the immune system functions, but it’s also one of the nutrients people tend to overlook.
Shellfish, particularly oysters and mussels, are rich sources.
“Zinc is essential for how immune cells develop and respond,” Madeline explains. “If levels are low, that response can be compromised.”
If shellfish isn’t your thing, other sources like seeds, nuts, and legumes can also help support intake.
Fatty fish
Fatty fish like salmon, tuna, and mackerel are often recommended for overall health, but they’re also relevant here.
They’re a natural source of vitamin D, which plays a role in regulating immune responses.
“Vitamin D is one of the most common deficiencies,” says Madeline. “And it’s closely linked to how the body handles infections, particularly during winter.”
Including fatty fish a few times a week can help support levels, especially when sun exposure is limited.
Spinach and leafy greens
Leafy greens tend to be underrated, especially in colder months.
But they provide a mix of vitamins and minerals that support immune function, including vitamins A and C, along with other key nutrients.
“It’s less about one nutrient and more about the combination,” Madeline says. “These foods support the system as a whole.”
If salads aren’t appealing in winter, adding greens into soups, pasta, or warm dishes is an easy alternative.
What actually makes a difference
There’s no single food that will “boost” your immune system overnight.
And focusing on one ingredient at a time usually misses the bigger picture.
“It’s about consistency,” Madeline says. “What you’re doing most of the time matters far more than what you do occasionally.”
A balanced approach, with a variety of whole foods, will always do more than chasing individual trends.
Because when it comes to supporting your immune system, it’s not about doing more. It’s about doing the basics well, and doing them regularly.
