Winter can place extra strain on the immune system – less sunlight, more exposure to bugs, and a slip in sleep, nutrition, and lifestyle habits. Infections can linger longer. The good news is our immune defences are built to be brilliant, working in two important layers: the innate system provides fast, front-line protection through skin, mucous membranes, and immune cells; the adaptive system follows, producing antibodies and immune memory to improve future responses.

 

The Innate System

 

The fast, first response that blocks and destroys germs. Physical barriers such as skin and mucous membranes, along with innate immune cells like neutrophils, macrophages, and natural killer (NK) cells, provide immediate defence against pathogens. These mechanisms help prevent infection and contain early threats before they spread.

 

The Adaptive System 

 

Relies on B cells and T cells, which generate antibodies and immunological memory after exposure to pathogens. This enables faster and more effective responses to previously encountered infections, forming the basis of long-term protection and vaccine effectiveness.

But both systems struggle if we don’t give them what they need - increasing the chance of catching infections and slows recovery. 

Spot the Signs Your Immunity Needs Help

If you notice any of these, it may be time to act.

 

Sign	What It Looks Like	Why It Happens
Frequent infections	3-4 colds a year, recurring sinus or skin infections	Reduced antibody activity or slow immune cells
Slow-healing cuts	Wounds that take more than two weeks to heal	Low zinc or vitamin A, needed for tissue repair
Constant fatigue	Feeling drained even after a full night’s sleep	Inflammation or low blood cell support
Digestive issues	Bloating, diarrhoea, or frequent tummy troubles	Gut immunity is out of balance
Skin problems	Eczema, rashes, or stubborn spots	Skin defences may be weak or overactive
Lingering colds	Symptoms hit hard or last longer than usual	Early immune response is sluggish

 

If these signs stick around, it’s worth checking in with your GP.

Eat Smart This Winter

Up to 80% of your immune cells are housed in your gut. Feed your body with foods that support your defences:

 

• Vitamin C: Oranges, kiwi, berries - help fight off viruses
• Leafy greens: Kale, broccoli - strengthen gut and skin barriers
• Orange vegetables: Carrots, sweet potatoes - keep your skin and mucous membranes healthy
• Fermented foods: Yoghurt, kefir - train your gut bacteria to support immunity
• Zinc sources: Almonds, seeds, legumes - energise your germ-fighting cells
• Omega-3 fats: Mackerel, sardines, eggs - reduce chronic inflammation

Six Simple Lifestyle Boosters

Sleep well: 7-9 hours a night fuels immune cells and antibody production. Anything less than 7 hours at night and you are 3 x more likely to catch a cold

Move daily: 150 minutes a week of brisk walks or light exercise improves circulation and reduces inflammation

Manage stress: Just 10 minutes of meditation, yoga, or deep breathing lowers cortisol that can weaken immunity

Stay hydrated: About 2 litres of water a day keeps lymph and toxins flowing

Wash hands properly: 20 seconds of soap can prevent up to 30% of infections.  

Lactoferrin: Keeps viral particles away from their target, acting like a bouncer for your body. Your body produces around 60mg per day, but Leapfrog IMMUNE supplements that with 250mg lactoferrin in a tablet

Socialise and laugh: Endorphins help boost antibody production

 

This winter isn’t about boosting immunity. It’s about supporting your defences at a cellular level.

Leapfrog IMMUNE supports a balanced immune system, giving the body more of what it needs to defend you.

 

 

Reference list

 

Barreto, I.C.D.P., Barreto, B.A.P., Cavalcante, E.G. do N. and Condino Neto, A. (2021). Immunological deficiencies: more frequent than they seem to be. Jornal de Pediatria, 97, pp.S49–S58. doi:https://doi.org/10.1016/j.jped.2020.10.009.

 

Clinic, C. (2024). What To Do for a Weak Immune System. [online] Cleveland Clinic. Available at: https://health.clevelandclinic.org/weak-immune-system.

 

Irwin, M., Mascovich, A., Gillin, J.C., Willoughby, R., Pike, J. and Smith, T.L. (1994). Partial sleep deprivation reduces natural killer cell activity in humans. Psychosomatic Medicine, 56(6), pp.493–498. doi:https://doi.org/10.1097/00006842-199411000-00004.

 

Méndez López, L.F., González Llerena, J.L., Vázquez Rodríguez, J.A., Medellín Guerrero, A.B., González Martínez, B.E., Solís Pérez, E. and López-Cabanillas Lomelí, M. (2024). Dietary Modulation of the Immune System. Nutrients, 16(24), p.4363. doi:https://doi.org/10.3390/nu16244363.

 

Monye, I. and Adelowo, A.B. (2020). Strengthening immunity through healthy lifestyle practices: Recommendations for lifestyle interventions in the management of COVID‐19. Lifestyle Medicine. doi:https://doi.org/10.1002/lim2.7.

 

NHS (2022). How to get more fibre into your diet. [online] NHS. Available at: https://www.nhs.uk/live-well/eat-well/digestive-health/how-to-get-more-fibre-into-your-diet/.

 

Passos, G.S., Poyares, D., Santana, M.G., Teixeira, A.A. de S., Lira, F.S., Youngstedt, S.D., Santos, R.V.T. dos, Tufik, S. and de Mello, M.T. (2014). Exercise Improves Immune Function, Antidepressive Response, and Sleep Quality in Patients with Chronic Primary Insomnia. BioMed Research International, 2014, pp.1–7. doi:https://doi.org/10.1155/2014/498961.

 

Rondanelli, M., Miccono, A., Lamburghini, S., Avanzato, I., Riva, A., Allegrini, P., Faliva, M.A., Peroni, G., Nichetti, M. and Perna, S. (2018). Self-Care for Common Colds: The Pivotal Role of Vitamin D, Vitamin C, Zinc, and Echinacea in Three Main Immune Interactive Clusters (Physical Barriers, Innate and Adaptive Immunity) Involved during an Episode of Common Colds—Practical Advice on Dosages and on the Time to Take These Nutrients/Botanicals in order to Prevent or Treat Common Colds. Evidence-Based Complementary and Alternative Medicine, [online] 2018, pp.1–36. doi:https://doi.org/10.1155/2018/5813095.

 

Shao, T., Verma, H.K., Pande, B., Costanzo, V., Ye, W., Cai, Y. and Bhaskar, L.V.K.S. (2021). Physical Activity and Nutritional Influence on Immune Function: An Important Strategy to Improve Immunity and Health Status. Frontiers in Physiology, 12(751374). doi:https://doi.org/10.3389/fphys.2021.751374.

 

Wintergerst, E.S., Maggini, S. and Hornig, D.H. (2006). Immune-enhancing role of vitamin C and zinc and effect on clinical conditions. Annals of Nutrition & Metabolism, [online] 50(2), pp.85–94. doi:https://doi.org/10.1159/000090495.