Electrolytes, Hydration and Energy

If you often find that your energy dips during the summer months, it can be easy to assume it’s just because you are busy, tired from the heat or not sleeping well. And, yes of course, those things could be part of the picture. But there may be another basic factor that you have missed: hydration.

In warmer weather, during travel, after exercise, or on days when you are rushing around and drinking less than usual, your fluid and electrolyte balance can shift. This can leave you feeling tired, headachy, light-headed, sluggish, constipated, foggy or even more prone to cravings.

It’s good to note that hydration is not just about drinking lots of plain water. Your body also relies on electrolytes, these are minerals such as sodium, potassium, magnesium, calcium and chloride, to help regulate fluid balance, nerve signalling, muscle function and normal cellular processes.

That doesn’t mean everyone needs to be popping expensive electrolyte powders every day. For most of us, the best place to start is much simpler: regular fluids, water-rich foods, balanced meals and a little more attention to salt and minerals when the weather is hot, you are sweating more, travelling, exercising (or losing fluid through diarrhoea or vomiting!).

Why Hydration Affects Energy and Digestion

Water is involved in almost every system in the body. It helps regulate body temperature, supports circulation, carries nutrients, helps remove waste products, supports concentration and helps keep the digestive system moving.

So when your fluid intake drops, your body has to work much harder. Blood volume may reduce slightly, which can contribute to feeling light-headed, tired or less able to concentrate. Your mouth may feel dry, your urine may become darker, and you may notice headaches or a general sense of feeling below par.

Digestion can also be affected. If you are prone to constipation, dehydration can make stools harder and more difficult to pass. The bowel draws water back into the body when fluid intake is low, which can leave stools drier and slower moving.

Hydration also matters if you are prone to diarrhoea. Loose stools do not just mean water loss. They can also mean loss of electrolytes, particularly sodium and potassium. This is one reason why oral rehydration salts are often recommended when diarrhoea is more than mild, especially when travelling, in hot weather, or if you are at higher risk of dehydration.

This is where the “just drink more water” advice can be too simplistic. Water matters, but if you are losing fluid through sweat or diarrhoea, you may also need to think about the minerals being lost alongside it.

Signs You May Need More Electrolytes

Electrolytes are minerals that carry an electrical charge when dissolved in fluid. They help your body maintain fluid balance and support normal nerve and muscle function.

The main electrolytes people tend to hear about are sodium and potassium, but magnesium, calcium, chloride, phosphate and bicarbonate are also part of the picture. You get these through food and fluids, and your kidneys play a major role in keeping levels balanced.

You may need to pay more attention to electrolytes if you are sweating heavily, exercising for longer periods, spending time in hot weather, travelling in a hot climate, drinking more alcohol than usual, or losing fluid through vomiting or diarrhoea.

That does not automatically mean you need a sports drink. It means your hydration strategy may need to be more than a few sips of water.

Sweating, Fatigue and Dizziness

Sweat contains water and electrolytes, especially sodium. Some people lose more salt through sweat than others. You may notice this if your clothes have white marks after exercise, your skin tastes salty, or you feel unusually wiped out after sweating heavily.

The NHS advises that heat exhaustion can happen during hot weather or exercise. Symptoms may include tiredness, dizziness, headache, feeling sick, excessive sweating, cramps and intense thirst. If someone does not improve after cooling down, or symptoms become more serious, medical help is needed.

This is particularly important for older adults, children, pregnant women, people with heart or kidney conditions, those taking certain medications, and anyone who is unwell. In these situations, dehydration and heat illness can become more serious more quickly.

For most healthy adults, prevention is practical rather than complicated. Drink regularly across the day, keep an eye on urine colour, increase fluids in hot weather or after sweating, and include mineral-rich foods rather than relying on coffee, alcohol or occasional large glasses of water.

Food-First Hydration Strategies

For most people, hydration support should start with food and routine, rather than supplements.

The NHS recommends aiming for around 6 to 8 cups or glasses of fluid per day, although you may need more if you are in a hot environment, physically active, pregnant or breastfeeding. Water is the obvious choice, but it is not the only one. Herbal teas, milk, smoothies, soups and water-rich foods can all contribute to fluid intake. Tea and coffee can contribute too, although relying heavily on caffeine may not be ideal if you are anxious, sleep deprived or prone to reflux or loose stools.

Water-rich foods can be particularly helpful in summer. Cucumber, tomatoes, courgettes, lettuce, watermelon, strawberries, citrus fruits, peppers, soups, yoghurt and smoothies all provide fluid as well as nutrients.

Electrolyte-rich foods can also be built into normal meals:

• Potassium is found in foods such as:
  • potatoes, bananas, avocado, spinach, beans, lentils, yoghurt, fish and dried fruit. 
• Magnesium is found in:
  • nuts, seeds, wholegrains, dark chocolate, leafy greens and legumes. 
• Calcium comes from:
  • dairy foods, calcium-set tofu, fortified plant milks, tinned fish with bones and some leafy greens. 
• Sodium is usually easy to obtain from the diet, but if you are sweating heavily or losing fluid, you may need a little salt with meals rather than eating very low salt all the time.

A practical summer hydration day might look like this:

Have water on waking, then breakfast with fluid and minerals, such as Greek yoghurt with berries and seeds, or eggs with sourdough and spinach.

Keep a bottle with you during the day, especially if travelling, commuting or spending time outdoors.

Include a water-rich lunch, such as a chicken and avocado salad with potatoes, a lentil and vegetable soup, or a salmon rice bowl with cucumber and peppers.

Add mineral-rich snacks where needed, such as fruit with yoghurt, oatcakes with hummus, a handful of nuts and seeds, or watermelon with feta.

This is simple, but it can make a real difference. Many people do not need a complicated hydration plan. They need regular fluids, enough minerals, enough food and a better awareness of when their needs increase.

When Electrolyte Drinks May Be Useful

Electrolyte drinks can be useful, but they are not all created equal and they are not automatically needed every day.

For general hydration, most people can meet their fluid and mineral needs through regular drinks, balanced meals and electrolyte-rich foods. But there are situations where electrolytes may be genuinely helpful, particularly when fluid losses are higher.

This includes endurance exercise, such as long runs, cycling, hiking, triathlon training or events lasting longer than around 60 minutes. It can also include exercising in hot or humid weather, heavy sweating, long travel days in hot climates, diarrhoea or vomiting, working outdoors, or feeling light-headed, headachy or unusually wiped out after sweating.

During endurance exercise, you are not just losing water. Sweat contains electrolytes, particularly sodium, and the longer you exercise, the more relevant this becomes. This is why plain water may not always be enough for longer or hotter sessions. If you are sweating heavily and drinking lots of plain water, but not replacing electrolytes, you may still feel flat, headachy or depleted.

I generally recommend a mineral-only electrolyte rather than a sugary sports drink for most clients. Many sports drinks and electrolyte powders contain added sugars, dextrose, glucose syrups, artificial sweeteners, flavourings, colourings or other additives that may not suit a sensitive gut. For some people, especially those with IBS, bloating, reflux, diarrhoea tendency, PCOS or blood sugar instability, these ingredients can be unhelpful.

This does not mean carbohydrate is not relevant for endurance exercise. It can be. But in practice, I often prefer clients to get their fuelling from real food wherever possible and use electrolytes separately for mineral replacement. This allows you to tailor hydration and fuelling more carefully, rather than relying on a brightly coloured sports drink that may not be right for your gut or your blood sugar.

For example, someone doing a long walk, run, cycle or hike might use a mineral-only electrolyte in water, then fuel with tolerated foods such as a oatcakes or rice cakes with nut butter, potatoes with salt, a simple homemade flapjack, sourdough with nut butter, or another carbohydrate-rich food that suits their digestion. For people with IBS, this can be much easier to personalise than using a standard sports drink.

For a short gym session, gentle walk, Pilates class or easy 30-minute jog, you probably do not need a special electrolyte drink. Water and normal meals are usually enough. But for longer runs, long bike rides, hot-weather training, races, long hikes or heavy sweat sessions, a more structured hydration plan may be useful.

How to Choose a Good-Quality Electrolyte Supplement

If you do decide to use an electrolyte product, it is worth reading the label carefully rather than assuming all products are created equal.

Some electrolyte supplements are good quality and can be genuinely useful in the right context. Others are little more than sugary flavoured drinks, or contain sweeteners, colours and additives that may aggravate bloating, reflux or loose stools.

A good-quality electrolyte product is usually one that has:

• A simple ingredient list
  Ideally, you want minerals without lots of flavourings, colourings, sweeteners, preservatives or “wellness” extras. The more sensitive your gut, the more important this becomes.
• Meaningful mineral content
  Sodium is often the most relevant electrolyte for sweat losses, but potassium, magnesium and chloride may also be included. Be aware that some products are marketed as electrolytes but contain very small amounts of minerals.
• No unnecessary sugar or dextrose
  Dextrose and glucose can be useful in specific oral rehydration products for diarrhoea, where the glucose-sodium ratio helps absorption. But for everyday hydration or mineral replacement during summer activity, many people do not need added sugar in their electrolyte drink. If you need carbohydrate for endurance exercise, it may be better to add this from food that suits you.
• No gut-irritating sweeteners or sugar alcohols
  Some products contain sorbitol, xylitol, mannitol or other polyols, which can aggravate bloating or diarrhoea in people with IBS. Some also contain high-dose vitamin C, caffeine, strong acids or flavourings that may not suit reflux-prone clients.
• A format that works for real life
  Drops, sachets or powders can all work. Liquids such as mineral electrolyte drops can be useful because they are easy to add to water and do not necessarily contain flavourings or sweeteners. The best product is the one you tolerate and will actually use.

It is also important to be wary of exaggerated “wellness” claims. You do not need an electrolyte drink to detox, cleanse, alkalise or magically fix fatigue. Electrolytes support normal fluid balance, nerve signalling and muscle function. That is useful and important, but it should not be overpromised.

Electrolyte products are not appropriate for everyone to use regularly without advice. If you have kidney disease, heart failure, high blood pressure requiring salt restriction, are on fluid restriction, or take medications that affect fluid or potassium balance, such as some diuretics, ACE inhibitors or ARBs, check with your GP or pharmacist before using electrolyte supplements regularly.

A Simple Summer Hydration Reset

If you suspect you are not drinking enough, keep it simple for a week.