Can What You Eat Help You Stay Cool? The Surprising Science Of Summer Foods

When temperatures soar in the UK, most of us instinctively reach for a cold drink, find the nearest patch of shade, and complain loudly about how our homes were clearly designed to trap heat indefinitely.

But what if your lunch could help too?

While no food can magically turn you into an air-conditioned human, nutrition experts say that what you eat can affect hydration levels, energy, digestion and how comfortable you feel during hot weather. In fact, around 20% of our fluid intake comes from food, not just drinks.

So, if you're looking for another excuse to eat watermelon this summer, you're in luck.

Why Food Matters When It's Hot

When the weather heats up, your body works harder to regulate its temperature, primarily through sweating. This means you lose both fluid and minerals more quickly than usual, making hydration especially important.

The good news is that many fruits and vegetables contain surprisingly high amounts of water and can help support hydration throughout the day. Nutrition experts also suggest choosing lighter meals during hot weather, as heavy, rich foods can leave you feeling sluggish and uncomfortable.

In other words, there may be an actual scientific reason why nobody craves a roast dinner when it's 32°C outside.

Watermelon: Summer's MVP

Let's start with the obvious hero.

Watermelon contains more than 90% water, making it one of the most hydrating foods you can eat during a heatwave. It's refreshing, easy to digest and packed with flavour.

It also has the added benefit of being socially acceptable to eat in enormous quantities.

Whether you enjoy it sliced, blended into smoothies or tossed into a salad with feta, watermelon is probably doing more for your hydration than you realise.

Cucumbers Deserve More Respect

Cucumber isn't exactly exciting (unless you’re a cat).

And we appreciate nobody has ever rushed to a family barbecue shouting, "Quick, bring out the cucumbers!"

But perhaps they should.

According to Bupa UK, cucumbers are made up of around 96% water, making them one of the most hydrating foods available.

Add them to salads, sandwiches or infused water and you'll quietly boost your fluid intake while pretending you're the sort of person who makes healthy choices all the time.

Tomatoes Are Secret Hydration Champions

Tomatoes are roughly 95% water and provide useful nutrients, including vitamin A.

And the beauty of tomatoes is their versatility. They work in salads, wraps, pasta dishes and cold summer lunches, helping you increase hydration without feeling like you're eating too healthily.

They're basically the undercover agents of the fruit and vegetable world. Get chopping!

Yoghurt: The Unexpected Summer Essential

If you're looking for a cooling snack, yoghurt is worth keeping stocked in the fridge.

Experts highlight yoghurt as a food that contributes to hydration while also providing protein and other nutrients. It can be enjoyed on its own or combined with fruit to create a refreshing summer breakfast or dessert.

Also, unlike ice cream, it's slightly easier to justify having before 10am.

What About Spicy Food?

Here's where things get interesting.

Many hot countries have cuisines packed with spicy foods, leading people to wonder whether chilli peppers can actually help cool you down.

In a way, they can.

Spicy foods can increase sweating, which is one of the body's natural cooling mechanisms. However, if you're already feeling overheated, a fiery vindaloo might not be the relaxing summer meal you're hoping for.

Proceed with caution and keep a glass of water nearby.

Foods That May Make You Feel Hotter

While there aren't many foods you need to avoid completely, nutritionists generally recommend choosing lighter meals during hot weather, rather than rich, heavy dishes. Digestion itself generates heat, so very large meals can leave you feeling warmer and more sluggish.

This doesn't mean you have to abandon burgers, pizzas or fish and chips.

It simply means that eating three portions while sitting in direct sunlight might not be your finest decision.

Don't Forget Actual Drinks

As helpful as hydrating foods can be, they shouldn't replace drinking fluids.

The NHS recommends aiming for around six to eight glasses of fluid per day, with extra liquids often needed during hot weather. Water is an excellent choice, but tea, coffee, milk and sugar-free drinks can also contribute to your daily intake.

A good reusable water bottle can make staying hydrated much easier, especially when you're on the move.

Food For Thought

Can food actually help keep you cool?

Not in the sense that eating a cucumber instantly turns your living room into an Iceland freezer aisle. But choosing water-rich foods such as watermelon, cucumber, tomatoes and yoghurt can support hydration and help you feel more comfortable during hot weather.

So, next time the UK experiences another heatwave, don't just think about what's in your glass.

Think about what's on your plate too.