Flu Cases Surge 5x in Korea: Boost Immunity with These Fruits & Veggies

Influenza cases are currently surging in South Korea, with rates exceeding epidemic thresholds and raising concerns about a potentially severe flu season. Data from the Korea Disease Control and Prevention Agency (KDCA) indicates that the influenza-like illness (ILI) rate reached 13.6 cases per 1,000 outpatients during the week of October 19-25, 2025 – a figure 3.5 times higher than the same period in 2024.

This surge is particularly pronounced among children. The KDCA reports that children aged 7 to 12 are experiencing 31.6 cases per 1,000 outpatients, while those aged 1 to 6 have an incidence rate of 25.8 – the highest this season. Other age groups are also affected, with rates of 16.4 per 1,000 among infants under 1, 15.8 per 1,000 among teenagers aged 13 to 18, and 11.8 per 1,000 among adults aged 19 to 49.

The dominant strain circulating is influenza A (H3N2), known for its ability to infect both humans and animals and its potential to cause global pandemics. Health officials project that this year’s epidemic peak could match the severity of the 2024-25 season, which was the largest influenza outbreak in the past decade.

Amidst this increase in cases, pharmacies are reporting disruptions in the supply of key antiviral medications. The early onset of the season, coupled with larger-than-usual outbreaks in countries in the southern hemisphere like Australia, are contributing factors to the current situation.

Supporting Immune Health Through Diet

While medical interventions are important, bolstering the immune system through nutrition is a proactive step individuals can take during flu season. Fruits and vegetables are naturally rich in vitamins, minerals, and phytochemicals that support immune function. Adequate hydration and a fiber-rich diet are also crucial components of a healthy immune response.

Several fruits and vegetables stand out for their immune-boosting properties. Tomatoes, for example, are high in water content and potassium, contributing to hydration and electrolyte balance. They also contain lycopene, an antioxidant that may help protect against lung damage and respiratory illnesses. Consuming tomatoes with a source of fat, such as olive oil, enhances lycopene absorption.

Grapes, particularly when consumed with the skin and seeds, provide resveratrol, an antioxidant with potential benefits for cancer prevention and skin health. However, individuals with kidney disease should exercise caution when consuming grapes due to their sugar content. A daily intake of 10-15 grapes is generally recommended, with those managing diabetes limiting their intake to 10 or fewer.

Watermelon is another excellent source of hydration, composed of 92% alkaline water, which aids in detoxification and supports kidney function. It also contains lycopene and citrulline, the latter of which can help lower blood pressure and reduce swelling. The white part of the watermelon, often discarded, contains even higher levels of citrulline than the red flesh.

Cherries are rich in antioxidants and melatonin, a hormone that promotes sleep. Their low glycemic index makes them a suitable choice for individuals with diabetes or those monitoring their blood sugar levels. However, dried or canned cherries have a higher glycemic index and are best avoided.

Carrots, particularly those harvested during the winter months, are a good source of beta-carotene, which the body converts into vitamin A. Vitamin A is essential for vision and immune function. Consuming carrots with a source of fat, or cooking them, improves beta-carotene absorption.

These fruits and vegetables, along with a balanced diet and healthy lifestyle, can play a role in supporting the immune system during flu season. Maintaining adequate hydration, consuming sufficient fiber, and prioritizing nutrient-rich foods are all important steps in protecting against illness.

As of February 3, 2026, the situation in South Korea remains fluid, and continued monitoring by the KDCA is essential. Individuals experiencing flu-like symptoms should consult with a healthcare professional.