Not Drinking Enough Water Increases Stress Hormone Levels

Staying hydrated is important for many aspects of our health, and new research now shows it may play a crucial role in how our bodies respond to stress. A recent study conducted by experts at Liverpool John Moores University has revealed that people who do not drink enough water experience stronger biological responses to stress, even if they do not feel thirstier than those who stay well-hydrated.

The Study and Its Participants

The study included a total of 32 participants, divided into two groups. One group consisted of 16 people who drank less than 1.5 litres of water per day, which is considered below the recommended daily intake. The second group consisted of 16 people who followed the recommended daily fluid intake guidelines. These guidelines were based on recommendations from the European Food Safety Authority (EFSA), which advises that men should drink 2.5 litres of water daily, while women should drink around 2 litres.

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In addition to EFSA guidelines, in the United Kingdom, the Eatwell Guide recommends that adults consume six to eight cups of fluid daily, which is approximately 1.5 to 2 litres. It is important to note that fluid intake needs can change depending on certain factors. For example, people may need more water in hot weather, if they are physically active, recovering from illness, or if they are pregnant or breastfeeding.

Key Findings of the Research

The researchers found that participants who drank less water regularly had higher levels of cortisol, a hormone released in response to stress. Cortisol plays an important role in the body’s “fight or flight” response, but consistently high levels can have negative effects on health, including problems with sleep, digestion, immune function, and weight management.

Interestingly, the participants who drank less water did not report feeling thirstier than the people who drank the recommended amount of fluids. This suggests that people may underestimate their need for water, relying only on the feeling of thirst, which may not accurately reflect the body’s actual hydration needs.

Why Hydration Helps Manage Stress

Experts suggest that keeping a water bottle nearby, especially during stressful periods, can have long-term health benefits. Hydration helps the body regulate stress hormones, support brain function, maintain energy levels, and keep organs functioning properly. By drinking enough water regularly, the body is better prepared to handle stressful situations without overproducing stress hormones.

How Much Water Do We Really Need?

Hydration needs vary from person to person, but the general recommendations are:

• Men: 2.5 litres of water per day (around 10 cups)

• Women: 2 litres of water per day (around 8 cups)

• Adults (UK Eatwell Guide): 1.5–2 litres daily, about 6–8 cups

These are general guidelines and should be adjusted based on individual needs. For example, people who are active, exposed to heat, sick, pregnant, or breastfeeding may need to consume more water to stay properly hydrated.

Signs of Dehydration

Dehydration occurs when the body loses more water than it takes in. Common signs include:

• Dry mouth and lips

• Dark-colored urine

• Fatigue or low energy

• Dizziness or lightheadedness

• Headaches

Even mild dehydration can increase stress levels and affect mood, concentration, and overall health.

Tips for Staying Hydrated

Experts recommend a few simple strategies to make sure we drink enough water every day:

1. Carry a water bottle: Keeping water nearby makes it easier to drink throughout the day.

2. Drink regularly: Don’t wait until you feel thirsty; sip water at regular intervals.

3. Eat water-rich foods: Fruits like watermelon, oranges, and cucumbers add fluids to your diet.

4. Set reminders: Use phone alarms or apps to remind yourself to drink water.

5. Adjust for activity and climate: Drink extra water during hot weather, after exercise, or when ill.

This study highlights the important connection between hydration and stress management. People who do not drink enough water may experience a stronger biological stress response, even if they do not feel thirsty. Drinking enough water can help regulate stress hormones like cortisol, protect long-term health, and improve overall wellbeing.

Experts recommend making hydration a daily habit by keeping water within reach, especially during stressful times. By paying attention to fluid intake and listening to your body’s needs, you can better manage stress, stay healthy, and improve your quality of life.