What summer is actually doing to your body

Summer in Dubai puts our bodies under a kind of sustained stress that most wellness writing does not acknowledge. The heat itself, the disrupted sleep, the changed eating patterns, the reduced movement, the indoor air, the travel, the broken routines. None of these on their own are dramatic, but together they shift our physiology in ways that often take until September to fully reveal themselves, by which point the gap between where our bodies are and where we think they are has become wide.

This trilogy is for the residents who stay in the UAE, the residents who travel, and everyone in between. Across the next six weeks we will write about what extreme heat actually does to our physiology, what disrupted summer routines do to the systems beneath our awareness, and what the slower months make possible for the foundational health work that the active season rarely has room for.

Today we begin with the most visible signal. A body that is not holding water and electrolytes the way it should be.

The weekly theme. Heat, hydration, and the summer body

The popular framing of summer health in this region is to drink more water. It is not bad advice, but it is incomplete to the point of having a feeling of being misleading. Hydration is not the volume of water we put into our bodies. It is the proportion of that water our bodies actually hold onto, distribute, and use to support cellular function. The two are not the same thing, and in extreme heat the difference becomes large.

Our body in 40 plus degree heat with high humidity behaves differently from our body in temperate conditions. Our kidneys work harder, our sweat losses include significantly more sodium, potassium, and magnesium than people realise. Our blood volume shifts. Our heart rate runs higher at rest. Our cortisol curve flattens slightly under sustained heat stress. Our sleep becomes shallower as our core temperature struggles to drop appropriately overnight. Our appetite changes, sometimes in ways that further unbalance our electrolyte intake. None of this is pathological. It is our body adapting to a real environmental load. But the adaptations have consequences, and the consequences accumulate.

By July, many residents in Dubai are showing signs and biomarker signatures that a functional medicine team can read clearly. Afternoon dips in energy, headaches, brain fog, and muscle cramps are not normal; they may be signs of dehydration. On lab tests, sodium status may be drifting high or, paradoxically, drifting low in those drinking large volumes of plain water without electrolyte replacement. Magnesium is often low across the board, while potassium remains variable. Cortisol patterns may shift, and sleep biomarkers including HRV, resting heart rate trends, and deep sleep percentage where wearables are tracking them, often show the same kind of background pressure.

This is not just because of seasonal weakness, it is the predictable physiology of our body under sustained heat stress, and it is responsive to inputs that are easy to overlook.

Dr. Saida Pseunokova

Case of the Week

Cases are composite portraits drawn from common presentations at Joint Space. They are not individual patient records.

A 44 year old woman came in describing what she called the usual summer pattern. Sleeping poorly through the warm nights despite the air conditioning. A fatigue she could not shake even on rest days, headaches she was attributing to dehydration, and a general sense that her body was working harder to do the same things it usually did with ease. She had been drinking what she considered adequate water through the day, had her sleep environment set up sensibly, and she had reduced her training intensity for the summer. However, none of it was helping.

The assessment included a full bloodwork panel and a urine collection. Her sodium status was running low, which surprised her given how much water she had been drinking. Her potassium was at the lower end of normal, magnesium was below the optimal range, and her urine analysis showed highly concentrated urine with an acidic pH. The lab results also showed that her cortisol curve was flatter than it had been on a previous workup three years earlier, her ferritin had dropped over the past few months, and her sleep markers were reflecting the pattern of a body under low-grade heat stress every night, never quite reaching the deep recovery states it needed. Her hydration strategy had been doing the opposite of what she intended: Drinking large volumes of water through the day had been diluting her electrolyte status, increasing her urinary losses, and leaving her actually less well hydrated than she would have been with a more considered approach. The headaches were a direct expression of the electrolyte picture. The poor sleep was downstream of the cortisol pattern, the magnesium status, and her core temperature regulation through the night. The fatigue was the sum of all of it put together.

The plan was straightforward once the picture was clear. A daily electrolyte protocol matched to her sweat losses. Targeted supplementation for magnesium, potassium, and a brief course of iron. A revised evening protocol including a cooler bedroom with a humidifier to ensure the air was not too druy from the air conditioning, and a small electrolyte intake before bed to support overnight hydration. Two Recovery Space sessions weekly using cold immersion for autonomic support at 14 degrees C. Six weeks later her markers had moved meaningfully and her subjective experience had shifted with them. The summer she had been told she had to endure had become a season she could function inside.

Functional medicine. The lead perspective this week

Many people enter the summer months believing they are doing hydration correctly. They drink more water, carry a bottle through the day, and respond to fatigue or headaches by increasing their fluid intake. Sometimes that helps, but often, especially in sustained heat, it is not enough.

This is why the question should not only be, “How much water are you drinking?” It should also be, “Are you absorbing and retaining it?”

Many people think hydration means adding salt to water, and sometimes it does. Sodium can be useful after heavy sweating, sauna use, intense exercise, low-carbohydrate diets, or prolonged outdoor heat exposure. But for optimal hydration we should think beyond sodium only. There are much more important players in fluid retention and right body distribution.

Potassium is one of the key minerals involved in helping water move into the cells. For most people, it is best increased through food rather than aggressive supplementation.

Good food sources include avocado, spinach and leafy greens, sweet potato, potato, lentils and beans, coconut water, banana, tomato, beetroot, yogurt, salmon, and other fish.

A simple daily strategy is to include at least one potassium-rich food with two meals per day. Eggs with avocado, lunch with leafy greens and lentils, dinner with salmon and sweet potato, or a smoothie with coconut water and spinach. These are small inputs, but repeated consistently, they change the mineral environment the body is working with.

Magnesium is often overlooked in hydration conversations, but it is central to muscle function, nervous system regulation, energy production, and sleep quality. Low magnesium intake may contribute to cramps, tension, poor recovery, lighter sleep, and the feeling that our body cannot fully relax.

Food sources include pumpkin seeds, almonds, cashews, dark leafy greens, lentils, beans, cacao, whole grains, avocado, and some mineral waters.

When supplementation is appropriate, magnesium glycinate, malate, or citrate are often better tolerated than magnesium oxide. Magnesium citrate may loosen the bowels, which can be helpful for some people with constipation but too much for others. A common practical range is 100–200 mg in the evening, adjusted to tolerance and clinical context.

There are also nutrients that support hydration beyond simply replacing water and minerals. Taurine acts like a volume regulator inside the cells. When cells shrink because of dehydration, taurine helps pull water back in. When cells swell too much, it helps release water back out. In this way, taurine supports the body’s ability to fine-tune intracellular hydration rather than simply pushing more fluid into the bloodstream.

Creatine works differently, but toward the same goal. It helps shift water from outside the cells to inside the cells, supporting intracellular hydration. This matters because water inside the cell is linked to better protein synthesis, mobility, recovery, and physical performance. For someone who feels depleted despite drinking enough water, this is an important distinction. The goal is not just fluid intake. It is better cellular water retention and better recovery at the tissue level.

How to Choose an Electrolyte Product

Many electrolyte products are marketed as hydration support, but the formulas vary widely. Some are mostly sodium with very little potassium or magnesium. That may be appropriate for endurance athletes or heavy sweaters, but it is not always ideal for daily hydration.

For general daily use, look for an electrolyte formula that includes meaningful potassium, magnesium in a well-absorbed form, moderate sodium rather than very high sodium, no unnecessary sugar, no artificial colors, and third-party testing where possible.

For intense sweating, endurance training, sauna use, or outdoor summer activity, a higher-sodium formula may be appropriate. For everyday indoor hydration, especially in someone already eating salty foods, a lower-sodium formula with potassium and magnesium support may make more sense.

A simple rule is to match the electrolyte formula to the situation.

Daily hydration is different from marathon hydration.
Office fatigue is different from two hours of outdoor training.
A salty restaurant diet is different from a whole-food, low-sodium diet.

Hydration is not about forcing more water into the body, it is about giving the body the right conditions to hold and use that water well. In the heat, this becomes one of the most important foundations for energy, sleep, recovery, and resilience.

Clinical: A brief supporting view

Clinically, summer in Dubai shifts how presentations show up. Muscle cramps and night cramps spike in residents who are under hydrated and low in the right balance of electrolytes. Headaches climb, heat related skin presentations show up, and slow tissue healing in those training indoors with insufficient mineral support. The clinical team treats the local presentation, but increasingly we refer to the functional medicine team in parallel when the picture suggests the underlying mineral and hormonal state is contributing.

Recovery: A brief supporting view

The Recovery Space becomes one of the most useful tools available in the heat months. The low light, mutli services, structured environment gives our nervous system the kind of downregulation that a Dubai summer outside the space does not naturally provide. Members who use the space two or three times a week through July and August often describe the difference as the season feeling shorter than it usually does.

Movement: A brief supporting view

Summer movement should look different from autumn or winter movement. Lower intensity for most of the working week, earlier morning or later evening sessions, indoor when possible and strength work over conditioning. The training that compounds across the active season is built in the summer, but it is built with respect for the conditions, rather than against them.

Insight of the Week

Hydration is not how much you drink. It’s what your body keeps

Volume is the input, and status is the output. The relationship between the two depends on electrolytes, kidney function, heat, hormonal context, and the patterns we cannot see from the outside. This is what makes a proper functional medicine workup unusually high impact in a Dubai summer.

Education. A brief supporting view

The most useful frame for anyone living in this region across the summer months is to treat the season as something that asks for adjustment rather than endurance. Our bodies are responsive. The adjustments do not need to be heroic. But ignoring the season and trying to run our regular winter rhythm into 45 degree weather is a strategy that compounds against us.

What’s new at Joint Space

Summer hours in the Recovery Space continue through July and August, with extended evening sessions running later than the standard winter schedule. Functional medicine appointment slots are open through the next two months, and for those staying here in the UAE over the summer, the slower months allowing for an opportunity to embed the protocols that are sometimes difficult to do during the usual busy periods before and after summer.

Book Functional Medicine appointment

Community at Joint Space

The Recovery Space has been busy with members managing the heat months. The conversations across the past fortnight have been telling. Almost everyone describes some version of the pattern in this issue. Most have not had it named in this way before.

This week’s invitation

If anything in this piece resonated, the long form version is the most useful place to start. Reply to this email if you would like to share your own version of this experience. We read every response, and what comes back from readers across July and August shapes what we write next.

Next issue we move from the body to the broader picture of what summer routines actually do to the systems beneath our awareness, with travel and disrupted rhythms as the worked example.

With warmth,
Dr Saida & the functional medicine team

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