Heat waves place real stress on the body. When temperatures climb, your heart works harder, fluid needs increase, appetite often drops, and dehydration can sneak up quickly — even if you don’t feel particularly thirsty. For many people, heat can also worsen fatigue, headaches, dizziness, digestive discomfort, and concentration.
The good news is that staying well during hot weather doesn’t require complicated rules or extreme changes. With a few nutrition and hydration strategies, you can support your body to cope better with heat, maintain energy, and reduce the risk of dehydration and heat-related illness. At Feed Your Future Dietetics, these are the practical foundations we focus on during extreme weather periods.
Hydration Is More Than Just “Drink More Water”
When it’s hot, your body loses fluid through sweat — and along with it, important electrolytes such as sodium and potassium. Drinking water is essential, but hydration works best when fluids are spread evenly across the day and supported by food.
Helpful hydration strategies include:
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Sip regularly, rather than waiting until you feel thirsty
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Keep a water bottle visible and within reach
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Aim for pale yellow urine as a general hydration guide
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Increase fluids during physical activity, time outdoors, or air travel
If plain water feels unappealing in the heat, try:
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Sparkling water with lemon or lime
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Water infused with berries, cucumber, or mint
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Iced herbal teas
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Diluted fruit juice (half juice, half water)
Don’t Forget Electrolytes
Excessive sweating without replacing electrolytes can increase the risk of headaches, weakness, and cramps. Electrolytes such as sodium, potassium, and magnesium help regulate fluid balance, muscle function, and nerve signals.
Foods that naturally support electrolyte intake include:
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Yoghurt or milk
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Cheese in small amounts
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Olives
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Soups and broths
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Bananas, oranges, and kiwi fruit
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Tomatoes and avocado
In some situations — such as prolonged heat exposure, heavy sweating, outdoor work, illness, or high physical activity — store-bought electrolyte drinks or powders may be helpful. However, electrolyte products vary widely in their sodium, sugar, and mineral content. The right option and amount depends on individual needs, medical conditions, medications, and activity levels.
This is why electrolyte use should be intentional rather than automatic, and tailored where possible.
Eat Light, But Eat Enough
Many people notice their appetite drops during hot weather. Skipping meals can worsen fatigue and make it harder for your body to regulate temperature.
Instead of heavy meals, aim for:
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Smaller, more frequent meals
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Foods that are easy to digest
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Cold or room-temperature options
Heat-friendly meal ideas:
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Greek yoghurt with fruit and nuts
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Wholegrain toast with cottage cheese and tomato
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Cold roast chicken with salad
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Tinned tuna or salmon with crackers and vegetables
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Smoothies with milk, fruit, oats, and seeds
At Feed Your Future Dietetics, we often remind clients that eating something regularly in the heat is far better than pushing through on empty.
Use Food to Boost Fluid Intake
Fluids don’t only come from drinks — many foods contain significant water and contribute to hydration.
High-water foods to include:
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Watermelon, rockmelon, strawberries
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Oranges and citrus fruit
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Cucumber, lettuce, zucchini
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Tomatoes
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Yoghurt and custard
Including these foods can help maintain hydration without needing to constantly drink large volumes.
Timing Matters in Extreme Heat
When temperatures peak, digestion can feel sluggish. Adjusting when you eat can help.
Consider:
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Eating larger meals earlier in the day
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Keeping dinners lighter
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Choosing cooling foods during the hottest hours
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Avoiding large, heavy meals late at night
Alcohol and excess caffeine can increase dehydration, so keeping these minimal during heat waves is protective.
Extra Care for Higher-Risk Groups
Some people are more vulnerable during heat waves, including:
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Older adults
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Children
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People with chronic illness
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Those taking certain medications
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People who struggle to recognise thirst
If this applies to you or someone you care for, proactive hydration and regular meals are especially important. Feed Your Future Dietetics frequently supports individuals and families to create simple heat-safe eating and drinking routines that feel manageable.
Take Home Message
Heat waves challenge the body, but consistent hydration, electrolyte support, and regular nourishing meals can significantly reduce their impact. Water, food-based electrolytes, and — when appropriate — carefully chosen electrolyte products can all play a role. The key is matching intake to your individual needs rather than following a one-size-fits-all approach.
If you’d like personalised support to manage hydration, energy, and nutrition during extreme weather, Feed Your Future Dietetics offers Telehealth consultations across Australia.
👉 Get in touch with Feed Your Future Dietetics to create a practical, personalised plan that keeps you feeling well, supported, and resilient — even when the temperature soars.
