Winter is about more than cold mornings and extra layers. The drop in temperature sets off a series of physiological changes that affect everything from your circulation and hydration to your energy levels and immune system. “Winter doesn’t just make us feel uncomfortable,” says Keri Rudolph, CEO of IV Bar. “It changes how our cells function, how our immune system responds and even how our mood and energy are regulated.”
Research suggests respiratory viruses spread more efficiently in cold, dry air, while spending more time indoors increases exposure to germs. At the same time, reduced sunlight disrupts your circadian rhythm, increasing melatonin production and lowering serotonin levels, leaving many people feeling sluggish, tired and mentally foggy. South Africa’s flu season also peaks during winter. Surveillance data from 2025 found influenza accounted for nearly 97% of detected respiratory virus infections, highlighting the additional strain colder months can place on your immune system.
Why the Cold Makes Your Body Feel Slower
When temperatures drop, your body shifts into survival mode. “Your blood vessels tighten to keep your core warm, reducing circulation to your hands, feet and skin,” Rudolph explains. “That’s why many people feel stiff or slow before they’ve even started the day.”
Your metabolism also works harder to maintain body temperature, while muscles naturally contract more in the cold, making movement feel heavier and increasing the likelihood of stiffness. Fortunately, supporting your body through this seasonal shift does not require complicated interventions.
“Staying hydrated helps maintain blood volume, which supports circulation. Regular movement, even short bursts, keeps blood flowing and muscles warm. Layering properly also makes a bigger difference than most people realise.”
Why Winter Fatigue Feels So Real
If you find yourself struggling to get going during winter, biology may be to blame. “With fewer daylight hours, your body produces more melatonin, the hormone that signals sleep, and less serotonin, which helps keep you energised and mentally sharp,” says Rudolph.
Colder temperatures, an increased immune workload and spending more time indoors all contribute to lower energy levels. Simple habits can help restore your body’s natural rhythm. Getting outside for early morning sunlight, maintaining a consistent sleep schedule and eating regular meals that include quality protein can all help stabilise energy throughout the day.
Your Immune System Has More Work to Do
Winter does not automatically weaken your immune system, but it creates conditions that make infections more likely. “Cold, dry air weakens the mucosal barrier in your nose and throat, which is your first line of defence against viruses,” Rudolph says. “Because people spend more time indoors, exposure to germs also increases dramatically.”
Supporting immunity starts with evidence-based habits rather than quick fixes. Eating nutrient-dense foods, washing your hands regularly and adding moisture to dry indoor air can all help reduce your risk of illness during winter.
You’re Probably More Dehydrated Than You Think
Many people associate dehydration with hot weather, but winter can be just as problematic. “Cold temperatures blunt your thirst response, so you simply don’t feel the urge to drink,” says Rudolph. “But your body continues losing fluid through breathing, temperature regulation and indoor heating.”
READ MORE: The Best Winter Skincare Routine for Men, According to a Medical Therapist
Even mild dehydration can contribute to headaches, fatigue, poorer concentration and slower recovery after exercise. Rather than trying to drink large volumes at once, Rudolph recommends building hydration into your daily routine through regular water intake, herbal teas and water-rich foods such as soups, fruit and vegetables.
Why Your Muscles and Joints Ache More
Reduced circulation affects more than just cold hands. “When blood vessels constrict, muscles tighten and joints become stiffer,” Rudolph explains. “Even healthy, active people notice the difference because cold weather reduces elasticity in soft tissue.”
Those living with arthritis or existing inflammatory conditions may experience worsening symptoms during winter, but anyone can benefit from keeping their body moving. Warm baths, regular stretching and consistent exercise all help improve circulation and reduce stiffness. “You don’t need intense workouts to feel better,” Rudolph says. “Winter rewards people who stay active, even in small ways.”
Winter Can Increase Inflammation
Emerging research suggests winter may also contribute to increased low-grade inflammation. Reduced physical activity, disrupted sleep, dietary changes and stress can all contribute to higher inflammatory markers, affecting recovery, muscle soreness and joint comfort.
“For many men, this shows up as joint discomfort, muscle tightness or slower recovery after training,” says Rudolph. She recommends prioritising sleep and including anti-inflammatory foods such as berries, leafy greens, turmeric and omega 3-rich foods as part of a balanced diet.
Build Your Winter Routine Around the Basics
According to Rudolph, the most effective winter wellness strategies remain the simplest. “The fundamentals of quality sleep, hydration, nutrient-dense food, moderate exercise and stress management are consistently backed by research. These habits support hormone balance, immune function and energy production.”
READ MORE: 3 Lean-Eating Winter Recipe Soups You Need To Try Now
She adds that many people also fall short on nutrients including vitamin D, magnesium, zinc and antioxidants during winter, making colourful vegetables, lean proteins, healthy fats, soups, broths and citrus fruits valuable additions to your plate.
Where Does IV Therapy Fit?
While Rudolph believes IV vitamin therapy can support recovery during periods of high stress, illness or fatigue, she emphasises that it should complement, not replace, healthy daily habits. “Think of IV therapy as your boost, and sleep, hydration, nutrition and movement as your foundation,” she says. “It works best when paired with strong daily habits.”
Ultimately, winter resilience is built long before you feel run down. “Wellness isn’t about waiting until you’re exhausted or ill,” Rudolph says. “Small, consistent actions make the biggest difference. Winter may change the environment, but it doesn’t have to define how you feel.”
Meet Keri Rudolph
Keri Rudolph is the founder and CEO of The IV Bar Group, one of South Africa’s largest IV vitamin therapy providers. With more than 20 years’ experience in corporate communications, marketing and business leadership, she has built a national wellness brand focused on preventative health and functional wellbeing. Rudolph is a passionate advocate for proactive healthcare, encouraging people to prioritise nutrition, hydration, recovery and lifestyle habits to support long-term health and resilience.
