Winter puts our endurance to the test. To withstand the cold effectively, your body requires impeccable sports nutrition specially adapted to this demanding season.
- Your body expends more energy to maintain its body temperature
- Dehydration occurs discreetly, without a pronounced feeling of thirst
- The immune system is more vulnerable to viruses
This guide answers 10 crucial questions to help you properly prepare for your winter efforts. Our goal: to give you everything you need to stay as enduring as a mule despite the biting cold.
Ready to discover our tips? Let’s get started.
Why do you burn more calories during intense exercise in the cold?
After a long outing in cold weather, you probably feel intense fatigue and ravenous hunger—far more pronounced than after the same effort at 20°C. This feeling isn’t imaginary; it’s a normal physiological response.
Your internal furnace is running at full capacity
Your body functions like a well-insulated house that must maintain its body temperature at 37°C. In winter, your metabolism works harder to compensate for heat loss, drawing on your precious glycogen stores.
During a winter effort, you experience a double energy expenditure:
- The energy required for physical effort
- The energy needed to warm yourself up
Studies show that this overconsumption can increase from 10% to more than 40%, depending on the intensity of the cold and your equipment.
The trap: running out of fuel without warning
The main mistake? Applying the same nutrition strategy as in summer. Your glycogen stores, expected to last 3 hours, may run out in 2 hours 30 minutes, or even sooner, because of this invisible overconsumption.
Result: the famous runner’s “wall” or the cyclist’s terrible hunger pangs that turn the end of a ride into an ordeal.
Nutrition strategy adapted to cold weather
The solution? “Fuel your internal furnace” more generously:
- Anticipate your energy intake: start eating 30 minutes earlier than you would in summer.
- Increase your carbohydrate intake by 10–20%/h (e.g., increase from 60g to 70g/h).
- Never neglect your pre-exercise meal: optimal glycogen stores are your best protection against the cold.
Mulebar energy bars provide this ideal energy density thanks to their blend of rice syrup, oat flakes, and date paste—carbohydrates with gradual release, perfect for prolonged efforts in the cold.
The winter tip: Slip your energy bar into an inner pocket close to your body. Your natural warmth will keep it soft and easy to eat, even in very cold weather.
Hydration in winter: why does your body lie to you?
Here is one of the major pitfalls of winter sports. During exercise, everything seems normal: no dry mouth like in summer. But afterward, headaches appear, your urine is dark, and your performance has inexplicably declined.
In winter, your body misleads you about your water needs. Knowing how to overcome these false signals is essential for maintaining performance in the cold.
The great paradox of winter thirst
The cold disrupts your internal sensors. Two main mechanisms occur:
- Peripheral vasoconstriction: To protect your organs, your body reduces blood flow to your extremities (hands and feet). This reaction increases central blood volume, which the brain interprets as excess fluid. The result: less thirst but a greater urge to urinate—this is "cold-induced diuresis."
- Hidden respiratory losses: Because winter air is dry, your lungs have to humidify it. With every exhalation, you therefore lose water without realizing it.
The trap of silent dehydration
Don't think that only sweating matters. In winter, even if you sweat less, dehydration still occurs. It is simply less noticeable.
Losing just 2% of your body weight in water can reduce your performance by 20%.
Consequences: heart rate racing during the same effort, increased risk of cramps, and slower muscle recovery.
Smart hydration protocol
Rely on a strategy rather than your sensations:
- Anticipate thirst: Drink 300 to 500 ml of low-mineral water before exercise, then 150–250 ml every 15–20 minutes during physical activity.
- Use reminders: Set alerts on your watch every 20 minutes.
- Weigh yourself: Every kilogram lost after a long outing is equivalent to approximately 1 liter of uncompensated water loss.
- Add electrolytes: Your drink should contain sodium, magnesium, and potassium, especially for efforts lasting more than 2 hours.
Drinking ice-cold water at 0°C is hardly enjoyable. Our powdered Mulebar energy drinks become invaluable in winter: they hydrate, replace lost electrolytes, and provide the carbohydrates needed to face the cold.
The winter tip: Prepare your drink with water at 40°C before setting off. This delays cooling and prevents it from freezing in the bottle.
Hot drink in a thermos: good or bad idea?
It is easy to imagine the runner stopping to enjoy a sip of hot tea straight from their thermos—a fairly classic image.
On paper, the idea seems perfect: stay hydrated while warming up with a hot drink. But it is crucial to find the right balance between psychological comfort and actual effectiveness for the body.
The temperature battle
During exercise, your body must simultaneously manage fluid absorption and maintain its internal temperature.
The advantage of warmth: A drink at 40–50°C provides genuine psychological comfort and warms the body, temporarily easing the demands of thermoregulation.
The problem with drinks that are too hot: The stomach cannot process scalding liquids efficiently. For rapid absorption, the ideal temperature is between 10 and 15°C. A drink that is too hot therefore remains in the stomach longer.
Hybrid temperature-management strategy
Adapt your approach to the conditions:
- For continuous effort: Choose lukewarm drinks at around 40°C—the perfect compromise between comfort and rapid absorption.
- For long, low-intensity outings: A thermos becomes very useful. An infusion (ginger, thyme) or simply hot water lightly sweetened with honey is excellent during breaks.
- Avoid diuretics: Forget coffee and regular tea in your thermos, as they increase dehydration.
If you don’t have the time or inclination to carry a thermos, our Mulebar energy gels are a practical alternative.
Their texture remains fluid even in very cold weather, and they provide readily available carbohydrates without requiring very cold water.
A winter tip: Keep your gels in a pocket close to your body. Take one five minutes before a long climb: this quick energy boost will help your body produce more heat.
Fats: your little-known allies for long efforts in winter
In the world of sport, the word “fat” often makes people grimace. It is immediately associated with weight gain, which every athlete seeks to avoid. Yet some high-quality fats can become valuable allies for getting through the winter season.
Your body has two fuel tanks
Imagine your body as a hybrid car equipped with two separate tanks:
- The “Performance” tank (carbohydrates): Like a small tank of premium gasoline. It provides explosive energy for accelerations. Its capacity is limited—around 90 minutes at full speed, or even less in winter.
- The “Endurance” tank (fats): A huge, almost inexhaustible tank. It is the ideal energy source for prolonged efforts at moderate intensity. Omega-3s provide their valuable anti-inflammatory properties.
Don’t rely on sugar alone
During a sports session lasting more than 3–4 hours, focusing only on carbohydrates can cause digestive problems, nausea, and even a feeling of disgust caused by being overwhelmed by sweet flavors.
By neglecting fats in your diet, you deprive your body of a powerful energy source and reduce its ability to manage inflammation.
Winter fat strategy
Adopt this two-pronged approach:
- Develop your “fat-burning engine”: Include low-intensity endurance sessions. Like a water-powered mill, your body learns to draw efficiently on its fat reserves.
- Prioritize healthy fats every day: Choose oily fish (salmon, mackerel), nuts (walnuts, almonds), and virgin oils (olive, rapeseed) for their omega-3s and long-lasting energy.
- Make the most of omega-3s: Essential for fighting inflammation, they are particularly valuable for recovery after exercise during the winter.
For athletes, especially during the cold season, managing low-grade inflammation is crucial. That’s why we developed our omega-3 dietary supplement, made from wild fish oils and concentrated in EPA and DHA.
Practical tip: Take your omega-3s at breakfast. This way, you can benefit from their anti-inflammatory properties all day long and get through the winter in top form.
Turn your nutrition into an anti-virus shield for the winter
During winter, your intensive training sessions are aimed at preparing for your spring goals, but this period is also conducive to colds, gastroenteritis, and other viruses that could disrupt your training plan.
Your nutrition then becomes a strategic weapon: it provides your immune system with everything it needs to withstand attacks and regenerate effectively.
The "open-door" effect of intense training
Imagine your immune system as the guards of a fortress. After prolonged exertion in the cold, these defenders grow weaker and leave certain areas vulnerable for several hours. Scientists call this phenomenon the "open immune window," a period of 3 to 72 hours during which your body is more susceptible to infections.
The cold makes the situation worse by extending this window of vulnerability.
Don't just think about your muscles; think about your defenses
The classic mistake? Focusing solely on muscle recovery while forgetting to strengthen your immune defenses.
Even with legs in peak condition, a weakened immune system will prevent you from maintaining regular training.
The architecture of your immune shield
To build your defenses, provide your body with the best building materials:
- A palette of colors on your plate: Seasonal fruits and vegetables (kiwis, citrus fruits, carrots, squash, beets) are packed with fiber, antioxidants, and essential minerals to neutralize harmful invaders.
- Zinc, your secret ally: This valuable trace element, found in seafood, legumes, and pumpkin seeds, plays a key role in your immunity.
- A well-nourished microbiome: Did you know that 70% of your defenses are located in your intestines? Yogurt, kefir, garlic, and leek nourish this precious flora.
- Spices, your health allies: Turmeric (with pepper to help absorption), thyme, ginger, and garlic provide anti-inflammatory and protective benefits.
Vitamin C, which is vital for producing white blood cells, is not stored by the body. Our Organic Acerola offers a 100% natural solution because it is one of the richest fruits in vitamin C in the world.
Our winter tip: Take your vitamin C just after tough sessions, during that famous "open window." Mix it into your recovery drink made with water for optimal absorption and a quick boost for your body's defenses.
Keep your energy bars from becoming as hard as bricks
Every athlete knows this winter mishap: you take out your energy bar and there it is, hard as a rock. Not only do you risk breaking a tooth, but you also waste precious time and can't eat. The direct consequence: you're at risk of hitting the wall.
In reality, the problem does not come from the bar itself but from a simple physical principle.
The science of the freezing point
An energy bar combines syrups, dried fruit, cereals, and oilseeds, all of which react differently to the cold. The main culprit? The water contained in the syrups and fruit. As soon as the thermometer drops below 0°C, it turns into ice, creating microcrystals that freeze all the ingredients in place. The more the bar contains fast-acting sugars or saturated fats, the more quickly it hardens.
Take control of your nutrition instead of letting it control you
Biting into a frozen bar directly threatens your performance. Without a rapid nutritional boost, you risk a sudden drop in energy and a loss of concentration that could prove dangerous.
Effective anti-freezing tips
- Kangaroo strategy: store your energy bars in pockets close to your body. Your natural warmth will keep them at the ideal temperature.
- Planning ahead: move your bars from outer pockets to inner pockets 30 minutes before eating them.
- Preparation: cut your bars into pieces in advance if you are worried about them freezing; it will be easier to eat small pieces as you warm them in your mouth.
- Wise choice: choose textures better suited to the cold based on their composition.
- Smart substitutes: bring alternatives such as homemade cake, gingerbread, or compotes.
Faced with this recurring problem, we developed a range of energy compotes. Their semi-liquid texture prevents any unpleasant surprises, even when wearing gloves and at -10°C.
Our winter advice: compote remains your best nutritional insurance. Even if your bars have frozen, this easy-to-consume source of energy will always save the day.
Sugar or salt: the perfect balance during winter exercise
When we talk about sports nutrition, the first instinct is often to think of carbohydrates.
Salt, meanwhile, generally suffers from a less positive image.
Yet if you have ever experienced a dislike of sweet flavors that went as far as nausea, or suffered cramps despite an optimal intake of carbohydrates, you have neglected its valuable partner.
In winter endurance sports, pitting sugar against salt is a fundamental mistake: they are actually an inseparable duo.
A story of balance and overload
your body functions like a sophisticated machine that requires several elements simultaneously:
- Carbohydrate overload: After 2–3 hours of effort with only sugary intake, your taste buds reach their limit.
- Your brain then triggers rejection, ranging from simple weariness to genuine nausea, compromising your outing.
- The crucial importance of sodium: This mineral regulates the circulation of water in the body, maintains hydration, and is essential for muscle contraction.
- Even in winter, sweating causes significant sodium losses.
- A deficiency can lead to dehydration and muscle cramps.
Creating the perfect balance
Learn to make them work together rather than setting them against each other:
- The 3-to-1 rule: For every three sweet servings (gel, compote), plan one savory option (pretzels, broth).
- Anticipate fatigue: Start alternating from the 2nd hour of effort, even if everything seems normal.
- Monitor the composition of your drink: Make sure it contains enough sodium and electrolytes to compensate for losses.
Although cramps have multiple causes, an electrolyte imbalance remains a key factor. In cold weather, muscles contract more easily, increasing the risk. Our Mulebar Magnesium Bisglycinate, used during intensive training periods, can significantly improve your muscular comfort.
Does recovery really start with a hot drink?
After crossing the finish line, as your physical effort comes to an end, the appeal of a good hot drink is particularly strong in the middle of winter. But is it really the best way to start your recovery?
While the comforting aspect is important, it is above all the nutritional content of your drink that proves crucial. Don’t view recovery as a simple break, but rather as the foundation for your next training session.
The famous “metabolic window”
Immediately after exercise, your muscle cells enter an accelerated absorption phase lasting 30 to 45 minutes. During this optimal period:
- Carbohydrates are absorbed at an exceptional rate to replenish glycogen stores depleted by exertion.
- The protein is used immediately to repair damaged muscle fibers. Ideally, consume 20 to 25g of protein within an hour after exercise.
After this window, nutrient absorption becomes less efficient, further extending your recovery time.
Don’t just think about comfort—think about rebuilding
A simple tea or coffee may provide a feeling of warmth, but it offers no nutrients useful for rebuilding muscle. Worse, coffee has a diuretic effect that can compromise rehydration. By neglecting this nutritional intake, you deprive your muscles of the resources they need, delaying recovery and affecting your future performance.
Combine comfort and effectiveness
- Adopt the optimal 3:1 ratio: Within half an hour of exercise, aim for 3g of carbohydrates for every 1g of protein—a scientifically validated proportion.
- Choose a hot drink: A warm or hot drink helps you rehydrate, warm up, and optimize nutrient absorption. Chocolate milk is a perfect option that meets this ratio.
- Plan ahead: Prepare your recovery snack before heading out so you can eat it immediately when you return.
Our Mulebar protein bars have been specially designed to provide this ideal carbohydrate-to-protein ratio. They deliver both the protein needed for muscle rebuilding and the carbohydrates needed to restore your energy stores as glycogen.
Our special winter tip: Pair your bar with an herbal tea or rooibos (naturally caffeine-free) to combine nutrition with the pleasure of a comforting drink. An optimal and enjoyable recovery strategy.
Vitamin D: much more than a case of the winter blues
As the days grow shorter in winter, vitamin D is often associated with a lack of sunlight and low mood. But for athletes, its importance goes far beyond that. A vitamin D deficiency can seriously affect performance, recovery, and overall health.
Focusing solely on vitamin D’s psychological impact during winter means overlooking its major role in athletic performance.
The conductor vitamin
Acting as a prohormone, vitamin D regulates many biological processes. For athletes, three essential functions stand out:
- Pillar of the immune system: It activates your natural defenses, particularly T cells. A deficiency makes your body more vulnerable to infections.
- Guardian of bone strength: Essential for calcium absorption. Crucial for runners whose bones endure repeated impacts, it reduces the risk of stress fractures.
- Catalyst for muscle strength: Vitamin D stimulates the synthesis of muscle proteins, particularly in fast-twitch fibers (power and explosiveness). Good vitamin status improves strength and speeds up recovery.
At our latitudes, the angle of the winter sun means that the skin can barely synthesize vitamin D anymore, even during outdoor training in the middle of the day.
Outdoor training is not enough
From October to April, the majority of European athletes are deficient in vitamin D. Ignoring this fact increases the risk of infections, weakens bones under training loads, and limits muscle potential.
Preventive vitamin D strategy
- Have a blood test: Consult your doctor to measure your vitamin D level (25-OH-D) from autumn onward.
- Choose the right food sources: Include the few foods rich in vitamin D in your diet: oily fish (salmon, sardines, mackerel), egg yolks, and mushrooms exposed to UV light. Helpful, but rarely sufficient.
- Consider suitable supplementation: During winter, appropriately dosed supplementation (800–2,000 IU/day) becomes essential after consulting a doctor.
A good vitamin D status ensures strong bones. But don't forget that your joints, tendons, and ligaments, composed mainly of collagen, also suffer in harsh winter conditions. Our Marine Collagen from Mulebar protects this “flexible framework” of the athlete.
The winter tip: Think of nutrition as a puzzle. Vitamin D and calcium strengthen bone structure, while collagen nourishes connective tissues. A course of collagen during your major training cycles is an excellent way to prevent joint problems.
Can you copy and paste your summer nutrition plan for winter?
After months of fine-tuning, your summer nutrition strategy is now perfectly established. But is it wise to apply it as is during the winter season?
This is a common mistake: the equivalent of using road shoes for a mountain trail covered in snow. Your diet must adapt because winter completely changes the situation.
Winter rewrites all the rules
The cold season is not simply a cooler summer. It is a radically different environment with its own demands:
- Increased energy needs: your body uses more carbohydrates simply to maintain its temperature at 37°C in the cold.
- Reduced thirst sensation: dry air and the diuretic effect of the cold promote dehydration without triggering a natural warning signal.
- Vulnerable immune system: the well-known “immunity window” that follows exercise widens in winter, increasing the risk of infection.
- More complex nutrition logistics: energy bars harden and drinks can freeze, making your fueling strategy more complicated.
- Common vitamin D deficiency: lack of sunlight affects the production of this essential vitamin for bones, muscles, and immunity.
Your body is not unaffected by the seasons
Reproducing your summer diet exactly in winter means ignoring your nutritional needs, neglecting hydration, and exposing yourself to hunger pangs, colds, and chills. A combination that could turn your progress into stagnation.
Adapt your nutrition strategy like your gear
Approach your nutrition like your outdoor clothing: no one dresses the same way at -2°C as they do at 25°C:
- Increase your calorie intake: aim for 10–20% more carbohydrates per hour and a slight daily surplus to compensate for the energy expended fighting the cold.
- Hydrate proactively: schedule regular intake of electrolyte-enriched water without waiting until you feel thirsty.
- Adapt the textures: favor compotes and gels, and keep your energy bars protected from the cold.
- Boost your natural defenses: focus on foods rich in nutrients and micronutrients to support your immune system.
- Strengthen your nutritional foundation: supplement intelligently with omega-3s, magnesium, vitamin C, and collagen.
Example of an adapted winter menu:
- Breakfast: hot porridge with oats, banana, and nuts
- Lunch: lentil chili and salmon with roasted vegetables
- Snack: apple compote and a few nuts
- Dinner: hot vegetable soup and eggs
Since our beginnings, our philosophy has been to offer a complete range to support the athlete regardless of the season. Think of our products as a nutritional wardrobe:
- Our bars: your base energy, your first layer
- Gels and fruit purées: your energy windbreaker
- Drinks: your continuous hydration
- Protein bars: your recovery puffer jacket after exercise
- Supplements: your body's annual maintenance
Key advice: rather than looking for a miracle product, build your ideal nutrition system according to the duration, intensity, and weather conditions of your activity.
The time has come to put this into practice. Test, analyze, adapt. This guide provides benchmarks to help you listen to your body more closely. Nothing compares to that feeling of power and control when conditions become more challenging.
We sincerely hope these tips help you enjoy a memorable winter filled with exceptional sporting achievements.
All the tools you need to create your ideal nutrition strategy are available at www.mulebar.com
Frequently asked questions
What is the best diet for an athlete in winter?
When the cold sets in, a specially adapted diet becomes crucial for athletes. Prioritize:
- Complex carbohydrates (whole grains, legumes) as a long-term source of energy
- Healthy fats (oily fish, nuts and seeds) for their omega-3s
- Seasonal fruits and vegetables (citrus fruits, pumpkin) for an optimal intake of vitamins
Plan for energy expenditure to be 10–20% higher than in summer and pay particular attention to your hydration.
How should you adapt your nutritional needs for winter sports?
Winter sports such as skiing place significant demands on the body. To optimize your performance:
- Have a hot snack before the activity
- Keep energy bars warm against your body
- Drink regularly, even when you are not thirsty
After exercise, have a meal rich in protein and carbohydrates within 30 minutes for better muscle recovery.
Which dietary supplements should you take for winter sports?
During the cold season, certain supplements can be invaluable:
- Vitamin D (800–2,000 IU/day) to make up for the lack of sunlight and strengthen the immune system
- Omega-3s (1–2 g/day) for their anti-inflammatory properties
- Magnesium (200–400 mg/day) for cramps
- Vitamin C (500–1,000 mg/day) to support your defenses
Always consult a dietitian before starting supplementation.
