The arrival of the rains and relatively cold weather often signals the start of flu season, bringing with it a rise in coughs, cold, and other respiratory problems. There are even reports of the resurgence of COVID-19, is making rounds in the media. The focus is once again on practical steps to protect public health. While wearing masks, maintaining physical distancing, and improving ventilation remain essential, the role of good nutrition in supporting the immune system cannot be overlooked. In this article, we explore how a balanced diet can help the body defend itself against infectious respiratory diseases including colds, flu and COVID-19, and what this means for individuals and families seeking to stay healthy in the current climate.

Understanding The Immune System

The immune system is your body’s natural defence against infections. It is a complex network of cells, tissues, and organs that work together to detect and destroy harmful invaders like bacteria, viruses, and parasites. When this system is strong and balanced, it can fight off most infections efficiently and speed up recovery. However, when it is weakened due to poor nutrition, stress, or chronic illness the risk of prolonged or severe infections increases. Good nutrition supports:

• Immune cell production and function
• Wound healing and tissue repair
• Antioxidant defence against inflammation
• Energy for fever, coughing, or other symptoms

Key Nutrients for Fighting Infections

• Protein: This is essential for the production of immune cells and antibodies. During infections, protein needs increase. Eggs, poultry, fish, beans of all kinds, dairy, and lean meats are sources of protein.
• Vitamin C: This enhances immune cell function and acts as an antioxidant, reducing inflammation caused by infections. Sources of vitamin C are; oranges, bell peppers, pawpaw (papaya), tomatoes, guava, and strawberries.
• Zinc: It helps the immune system function properly and is involved in wound healing and fighting viral infections. Sources of zinc are meat, shellfish, beans, seeds, whole grains and groundnuts.
• Vitamin A: It maintains the integrity of the skin and mucous membranes which are the body’s first line of defence. Carrots, sweet potatoes, dark leafy greens, mangoes, eggs, and liver are good sources of vitamin A.
• Fluids and Electrolytes: Hydration is crucial, especially during fever or diarrhoea. It helps flush out toxins and supports all body functions. You can get this from drinking water, coconut water, clear broths, herbal teas, fresh fruit juices
• Healthy Fats: Good fats help absorb fat-soluble vitamins (A, D, E, K) and provide energy during times of poor appetite. Sources of healthy fats are avocados, nuts, seeds, olive oil, coconut water, palm oil in moderation.

Nutrition considerations when fighting an infection

When your body is fighting an infection, what you eat can make a big difference in how quickly you recover. It is best to limit sugary foods and drinks, as they may weaken your immune response. Highly processed snacks often lack the nutrients your body needs and may contain ingredients that promote inflammation. Alcohol and too much caffeine can also contribute to dehydration and lower your body’s ability to fight illness. If you have a poor appetite, which is common during illness, try eating small, frequent meals. Nutrient-rich options like smoothies, soups, and porridges are often easier to tolerate, and you can boost their energy content with ingredients like nut butter, eggs, or milk. If eating is too difficult, focus on staying hydrated until your appetite returns. Once you start to feel better, continue paying attention to your nutrition. Eating well after an infection helps to rebuild nutrient stores, repair body tissues, and restore any weight or strength you may have lost.

In summary

Good nutrition though not a substitute for medication can certainly support the immune system before, during, and after respiratory infections. Whether you are battling the flu, a cold or COVID-19, a nourishing balanced diet with a focus on the key nutrients discussed is one of your best tools for a quicker and stronger recovery. If you are dealing with a chronic infection or are unsure what to eat while sick, speak with a registered dietitian for a personalized nutrition plan.

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Written by Dr. Laurene Boateng (PhD, RD)
Dr. Laurene Boateng is a Registered Dietitian and Senior Lecturer in the Department of Dietetics, University of Ghana. She is the founder and editor-in-chief of Full Proof Nutrition, a website committed to providing reliable, evidence-based, and practical healthy eating advice. Click here to join Full Proof Nutrition WhatsApp channel and send us a mail at fullproofnutrition@gmail.com.

References

1. Calder, P. C. (2020). Nutrition, immunity and COVID-19. BMJ nutrition, prevention & health, 3(1), 74.