Summer invites us to spend more time outdoors, but the heat also brings its own challenges: increased sweating, changes in appetite and hydration, slower digestion, and even less motivation to cook.
To maintain energy and physical performance, we need to eat strategically. This means ensuring nutrients that support training, enhance recovery, and help the body cope with heat stress. Without adjusting our diet, we are at greater risk of hypoglycemia, dehydration, cramps, or even heat exhaustion.
🥗 How to adapt your diet to maintain energy and performance?
The heat forces the body to work harder to regulate temperature, increasing water and mineral loss through sweat. Additionally, many people prefer lighter, fresher meals— which can be beneficial if planned strategically, to ensure:
✅ Sufficient energy for training and daily activities.
✅ Adequate protein to maintain and recover lean mass.
✅ Proper hydration and micronutrient intake.
For those engaging in high-intensity or long-duration outdoor training (trail running, cycling, outdoor CrossFit, etc.), it's important to:
✅ Boost complex carbohydrates in pre-workout meals to maximize glycogen stores.
✅ Use homemade isotonic drinks (water or coconut water + natural orange juice + pinch of salt + honey) or commercial sugar-free options to replenish electrolytes.
✅ Opt for gels, squeezes, or 100% fruit purées for quick energy during races or long trails.
✅ Break down meals throughout the day for easier digestion and steady energy.
✅ Prioritize lean proteins for muscle repair and regeneration.
✅ Plan cold meals that are well stored.
✅ Always carry fresh water or electrolyte drinks in coolers — food safety equals long-term performance.
✅ Purchase and use seasonal products.
Which foods are best to avoid fatigue in summer?
Foods rich in water, electrolytes (potassium, magnesium), vitamins, and fiber, considering seasonality, which not only guarantees more flavor but also more nutrients.
Seasonal fruits, rich in water and electrolytes:
👉 Watermelon, melon, and cantaloupe
👉 Peach, nectarine, apricot, plum
👉 Berries, citrus fruits
👉 Figs, grapes, Rocha pear
Seasonal vegetables:
👉 Beefsteak or cherry tomatoes, cucumber, bell pepper
👉 Carrot, zucchini, eggplant
👉 Curly lettuce, arugula, watercress, lamb's lettuce
Complex and traditional carbohydrates:
👉 Brown/basmati/wild rice
👉 New potatoes and local sweet potatoes
👉 Whole wheat pasta/legumes
👉 Quinoa, millet
👉 Mixed flour bread or corn bread
Lean and easy-to-digest proteins:
👉 Sardines, horse mackerel, mackerel
👉 White fish (gilt-head bream, sea bass)
👉 Chicken and turkey
👉 Eggs
👉 Legumes (chickpeas, black-eyed peas, lentils)
Fats:
👉 Extra virgin olive oil, avocado, seeds (flaxseed, sunflower, pumpkin), nuts (almonds, walnuts...)
What to eat before and after training in summer to maintain energy and recover?
Training in summer is no excuse to skip meals or eat "just anything." In fact, it requires more planning.
Before training, the goal is to ensure stable energy to avoid dips and some protein to prevent catabolism, and of course, foods that are easy to digest to avoid discomfort.
Suggestions (30–90 minutes before):
👉 Banana or apricot with a little peanut or almond butter
👉 Dates stuffed with walnuts or almonds
👉 Bread or corn bread with hummus or almond butter and plant-based yogurt
👉 Protein liquid yogurt with rice or corn crackers
👉 Fresh fruit or 100% fruit squeezes
👉 Light smoothie with seasonal fruit and liquid yogurt
After training, it's time to replenish glycogen, rebuild muscle, and rehydrate.
Suggestions (within 2 hours):
👉 Protein shake with cereals and fresh fruit
👉 Greek yogurt or skyr with fresh fruit and seeds
👉 Oatmeal with honey, banana, and nuts
👉 Chicken breast or tuna in a cold pasta salad with vegetables
👉 Whole grain bread with egg, fresh cheese, and tomato
👉 Yogurt or egg with fresh fruit and crackers
How to ensure effective hydration in summer, especially for outdoor training?
Water "is not just to quench thirst": it transports nutrients, oxygen, and helps eliminate waste.
In heat, we sweat more to cool down the body, and sweat carries not only water but also minerals (sodium, potassium, magnesium). Even a mild loss of 2–3% of body weight in fluids can reduce muscle strength, endurance, and even affect concentration.
Therefore, it is important to:
• Not drink only when thirsty — thirst is already a warning sign.
• During long or intense training, drink 150–300 ml every 15–20 minutes (ACSM).
• Drink fluids regularly throughout the day.
• Include electrolyte drinks (homemade or commercial sugar-free).
• Gradually introduce salty snacks (like lupins or pickles) to replenish sodium.
• Prefer fresh water, unsweetened iced teas, or even flavored water with lemon, cucumber, and mint.
What are the risks of not adjusting diet and hydration during summer?
The risk is not just "being thirsty": dehydration can cause dizziness, cramps, heat exhaustion, hyponatremia, decreased strength, reduced endurance, increased perception of effort, gastrointestinal problems—situations incompatible with health or performance.
Summer is to be enjoyed to the fullest, both inside and outside of training, and eating well is not just about eating less: it means eating better, more consciously, and more adapted to the season and the effort the body requires.
And for those seeking results—whether aesthetic, health, or performance-related—this makes all the difference.
❓ FAQ - Frequently Asked Questions about Summer Nutrition
1. What should I eat before an intense workout in summer?
A light meal with complex carbohydrates is recommended to ensure stable energy and some protein to avoid muscle catabolism. Examples include banana with peanut butter or dates stuffed with nuts.
2. What is the best drink to hydrate during training?
Drinks with electrolytes are ideal to replenish minerals lost through sweat. You can opt for homemade isotonic drinks made with coconut water, orange juice, and a pinch of salt.
3. How can I maintain energy during long outdoor workouts in the heat?
For long workouts, it's important to split meals, consume gels or 100% natural fruit purées for quick energy, and drink liquids with electrolytes during training.
4. Which foods are most effective to avoid fatigue in summer?
Foods like watermelon, cucumber, peach, and tomato are rich in water and electrolytes, essential for hydration and preventing cramps. Additionally, lean proteins like sardines and chicken breast aid muscle recovery.
5. Should I drink water during training even if I'm not thirsty?
Yes! Not waiting for thirst to hydrate is fundamental, as thirst is already a sign of dehydration. Try to drink between 150-300 ml of water every 15-20 minutes during long or intense workouts.
📌 About the author
Rita Marques is a nutritionist passionate about helping people find balance between body, mind, and diet. With practical experience in the sports world and an individual-focused approach, she writes for BOOMFIT on topics of functional nutrition, performance, and well-being.
