Overcoming summer fatigue: 7 tips and the most important vitamins

Summer fatigue: why warm days can leave you feeling drained

Longer days, warm evenings and plenty of sunlight, summer sounds like the perfect season for more energy. Yet many people feel exactly the opposite. Heavy tiredness, poor concentration, a sluggish body and that typical afternoon dip can all be signs of summer fatigue.

Summer fatigue is more common than you might think. Heat, sweating, lighter meals and changes in your daily rhythm can all place extra demands on your body. In this blog, we explain why you may feel more tired during summer, what you can do about it and which vitamins and minerals can help support your energy metabolism.

What is summer fatigue?

Most people have heard of spring fatigue, but summer fatigue is just as real. It can feel like your body simply does not have the same energy as usual, even when the weather is bright and sunny.

Common signs of summer fatigue include:

• ongoing tiredness, even after enough sleep
• difficulty concentrating or a foggy feeling in your head
• dizziness, low blood pressure or a weak circulation
• low motivation or irritability
• a noticeable drop in energy during the afternoon

The important thing to remember: summer energy is not automatic. Heat, sweating and longer active days can ask a lot from your body. That is exactly where the causes of summer fatigue often begin.

Why does summer make you tired?

There are several reasons why your body may feel more tired during the warmer months. Often, it is not one single cause, but a combination of factors.

1. Heat puts extra pressure on your circulation

When temperatures rise, your blood vessels widen to help release heat from the body. This can lower your blood pressure and make your heart work a little harder. For people who already have low blood pressure, this can quickly lead to tiredness, dizziness or a heavy feeling in the body.

2. Warm nights can affect your sleep

Sleep is one of the first things to suffer during hot weather. When your bedroom is too warm, deep sleep can become shorter and less restorative. Less deep sleep means less physical and mental recovery, which can leave you feeling tired the next day.

3. You lose more fluids and electrolytes

When you sweat, your body does not only lose water. It also loses important electrolytes such as sodium, potassium and magnesium. Even mild dehydration can contribute to fatigue, headaches and difficulty concentrating.

4. Your eating pattern may change

In summer, many people eat lighter, more irregularly or reach more often for fruit, ice cream, soft drinks or quick snacks. This can lead to blood sugar fluctuations and a lower intake of protein, B vitamins and iron, all of which play a role in normal energy metabolism.

5. Your body clock may shift

Long evenings and more daylight can make it tempting to stay active later than usual. At the same time, bright light can influence your natural sleep rhythm. The result: shorter nights, less recovery and more fatigue during the day.

6. More plans, less recovery

Summer often means holidays, social plans, barbecues, day trips and outdoor activities. All lovely things, of course, but they still require energy. If your body does not get enough time to recover, tiredness can build up quickly.

What helps against summer fatigue?

The good news: with a few simple adjustments, you can support your energy levels during warm periods. These tips are easy to apply in everyday life.

1. Hydrate properly, not just more

During hot weather, drinking 2 to 3 litres per day can be realistic for many people. Choose water, unsweetened tea or water with added minerals. If you sweat a lot, electrolytes can help replenish minerals that are lost through perspiration.

2. Eat balanced meals with enough protein

Try to include a source of protein with each main meal. Good options include eggs, fish, chicken, yoghurt, quark, legumes, tofu or tempeh. Protein helps keep your meals more satisfying and supports recovery and daily energy needs.

3. Keep your bedroom cool and dark

A cooler bedroom can make a big difference to your sleep quality. Keep windows, curtains and blinds closed during the hottest hours of the day. Air the room in the evening or early morning when it is cooler outside. Blackout curtains can also help reduce early morning light.

For most people, a bedroom temperature between 16 and 19 °C is ideal, although this can be difficult to achieve during a heatwave.

4. Move during the cooler parts of the day

Exercise can support your energy, but intense activity during the hottest hours can be exhausting. Try to move in the early morning or later in the evening. Swimming, cycling or a brisk walk are gentle ways to stay active without putting too much pressure on your circulation.

5. Use the afternoon dip wisely

A short power nap of 15 to 20 minutes can help you feel more alert in the afternoon. Try not to sleep too long, as this may make it harder to fall asleep at night.

6. Be mindful with caffeine and alcohol

Coffee can give a quick energy boost, but too much caffeine, especially later in the day, can disturb your sleep. Alcohol can also affect hydration and sleep quality. During hot weather, it is smart to be extra conscious of both.

7. Get morning daylight

Bright natural light in the first hour after waking helps support your circadian rhythm. This can make you feel more awake during the day and naturally more tired in the evening. A short morning walk can already make a difference.

Which vitamins and minerals are important during summer fatigue?

A lack of certain micronutrients can contribute to tiredness or make fatigue worse. During summer, the following nutrients are especially relevant.

Magnesium

Magnesium contributes to normal energy-yielding metabolism and to the reduction of tiredness and fatigue. Because magnesium can be lost through sweating, your body may need extra support during warm periods or when you are very active.

B vitamins

B vitamins, including vitamin B12, vitamin B6 and folate, play an important role in energy metabolism. They help the body release energy from carbohydrates, fats and proteins. Vitamin B12 deserves extra attention if you eat vegetarian or vegan, or after bariatric surgery.

Iron

Iron contributes to normal oxygen transport in the body and to the reduction of tiredness and fatigue. Low iron levels can show up as fatigue, paleness, shortness of breath or reduced performance. Women, athletes and people with reduced food intake may be at higher risk of low iron levels.

Vitamin D

Even in summer, vitamin D levels are not always optimal. Many people spend much of the day indoors or use sun protection carefully, which is of course important for the skin. Vitamin D supports normal muscle function and the immune system.

Potassium and sodium

Potassium and sodium are important electrolytes for fluid balance, muscle function and nerve function. When you sweat a lot, these minerals can become unbalanced. This is an often-overlooked factor in summer tiredness.

Coenzyme Q10

Coenzyme Q10 is involved in energy production within the cells. The body produces Q10 naturally, but this production can decrease with age. For this reason, Q10 is often chosen by people who want to support their daily energy levels.

Tip: If your fatigue lasts longer or feels unusual, it is always wise to have your values checked by a doctor. That way, you know what your body actually needs instead of guessing.

Summer fatigue after bariatric surgery or while using GLP-1 medication

After a gastric bypass, gastric sleeve or another bariatric procedure, the body absorbs less food and often fewer micronutrients. This can increase the risk of deficiencies, especially when intake is already reduced during warm weather.

This can also be relevant for people using GLP-1 medication, such as semaglutide or liraglutide. Because appetite and portion sizes are often reduced, it may become harder to get enough vitamins, minerals and protein through food alone.

In these situations, targeted supplementation is not just a nice extra. It is an important part of daily support. Nutrients that often deserve extra attention include:

• vitamin B12, often in a high-dose or well-absorbable form
• iron in a gentle and well-tolerated form
• vitamin D3, often combined with vitamin K2
• magnesium in an organic form, such as bisglycinate or citrate
• a multivitamin complex tailored to increased needs

At WLS Products, you will find supplements that are carefully developed for these specific needs, with well-considered dosages and forms that fit daily use after bariatric surgery or during periods of reduced intake.

When should you seek medical advice?

Summer fatigue is usually harmless and often improves with rest, hydration, better sleep and balanced nutrition. However, it is important to contact a doctor if:

• fatigue lasts longer than 4 weeks
• you experience shortness of breath, heart palpitations or dizziness
• you lose weight without a clear reason
• your sleep, mood or daily performance clearly worsens

Persistent fatigue can sometimes be related to thyroid problems, iron deficiency, diabetes or other underlying causes that should be checked and treated properly.

FAQ about summer fatigue

How long does summer fatigue last?

For many people, summer fatigue lasts a few days to around two weeks, while the body adjusts to warmer temperatures. If tiredness continues for longer, it is worth looking at sleep, hydration, nutrition and possible nutrient deficiencies.

Which vitamins help with tiredness?

B vitamins, iron and magnesium are important nutrients for normal energy metabolism. If there is a proven deficiency, restoring your levels may help improve tiredness over time.

Why am I more tired in summer than in winter?

Heat causes the blood vessels to widen, which can lower blood pressure and make your circulation work harder. At the same time, you may lose more minerals through sweating and sleep less well because of warm nights. Together, this can quickly affect your energy.

Does coffee help against summer fatigue?

Coffee can help you feel more alert for a short time, but it is not a long-term solution. Too much caffeine can affect sleep and may make fatigue worse if it replaces proper hydration and balanced meals.

What should I eat during hot weather to feel less tired?

Choose light but nourishing meals with enough protein, plenty of vegetables, healthy fats and complex carbohydrates. Foods such as cucumber, berries, yoghurt, legumes, eggs, salads and soups can be helpful during warm days.

Conclusion: more energy in summer starts with the right support

Summer fatigue is not a sign of weakness. It is often a logical response from your body to heat, sweating, lighter sleep and a higher need for fluids and minerals. With enough hydration, cooler sleep, balanced meals and targeted support from vitamins and minerals, you can help your body feel more energised again.

Do you want to know which supplements suit your situation, for example after bariatric surgery or during GLP-1 therapy? At WLS Products, you will find a carefully selected range and personal advice to help you choose what fits your needs best.