What Happens When You Don't Drink Enough Water? 10 Hidden Effects on Your Body

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1. What happens to your blood when you become dehydrated?


Blood contains:

  • Red blood cells.

  • White blood cells.

  • Platelets.

  • Plasma, which is mostly water.

  • Proteins, electrolytes, nutrients and other substances.

When the body loses too much water, plasma volume can decrease. This can cause hemoconcentration, meaning some substances in the blood appear more concentrated.

Possible effects include:

  • Increased blood viscosity under some circumstances.

  • Reduced circulating blood volume.

  • Increased strain on the cardiovascular system.

  • Reduced blood flow to organs in severe dehydration.

This is different from having excessive cholesterol or fatty deposits in arteries.

NCBI+2

2. Does dehydration increase cholesterol readings?

This is where our article can become particularly interesting.

A small human study involving 15 healthy participants found that fasting without fluid replacement produced higher measured total cholesterol, LDL cholesterol and HDL cholesterol than fasting with water and salt replacement.

The researchers suggested that hydration status can influence lipid measurements.

PubMed+1

Therefore, we can explain three important distinctions:

  1. Dehydration can concentrate substances in blood because plasma volume decreases.

  2. Cholesterol readings may fluctuate with hydration status.

  3. This does not establish that inadequate water intake causes persistently high LDL cholesterol or creates cholesterol plaques.

What about oily-looking blood?

Blood that looks cloudy or milky can sometimes indicate lipemia, often associated with elevated triglyceride-rich particles. It is not a reliable visual indication of high cholesterol, and dehydration alone does not establish this condition.

A laboratory lipid profile is needed to assess cholesterol and triglycerides.

3. Ten ways insufficient water intake affects the body

 

 1. Brain function : headache,dizziness, difficulty concentrating, and impaired mental performance

2. Heart and blood circulation
Reduced blood volume, faster heartbeat and cardiovascular strain.

3. Kidney function
Concentrated urine, reduced urine output and increased risk of kidney stones. Severe dehydration can cause acute kidney injury.

4. Digestive system
Constipation and difficulty maintaining normal bowel movements.

5. Skin health
Dryness and reduced skin elasticity can accompany dehydration.

6. Joint lubrication
Water contributes to synovial fluid and normal joint function.


8. Muscle performance
Fatigue, reduced physical performance and increased risk of heat-related problems.

9. Blood composition
Reduced plasma volume and hemoconcentration, potentially affecting measured blood values.
10. Cellular functions
Water is essential for chemical reactions, nutrient transport and maintaining the balance inside and outside cells.

4. How much water does your body need daily?

There is no single amount that suits everyone.

As a general reference, the US National Academies gives the following adequate intake estimates for total daily water:

Adult

Total water per day

Men

3.7 litres

Women

2.7 litres

These figures include drinking water, other beverages and moisture from food. They are not requirements to drink that entire quantity as plain water.

National Academies+2

In Malaysia, hot and humid weather, sweating and physical activity can increase fluid requirements.

5. Warning signs that you may not be drinking enough


  • Frequent thirst.

  • Dark yellow urine.

  • Dry mouth and lips.

  • Headaches.

  • Dizziness, particularly when standing.

  • Unusual tiredness.

  • Reduced frequency of urination.

Severe dehydration can cause confusion, fainting and shock, requiring urgent medical attention.

NIH News in Health+1

6. How to maintain healthy hydration

  • Drink water regularly throughout the day.

  • Drink more when sweating heavily or spending time outdoors.

  • Eat water-rich fruits and vegetables.

  • Avoid relying heavily on sugary beverages.

  • Pay attention to thirst and urine colour.

  • Do not wait until you feel extremely thirsty.

People with heart failure, kidney disease or certain other medical conditions may need individual fluid restrictions rather than simply increasing their water intake.

7. The bigger picture: Water and long-term health

This is an important message to conclude our article with.

Water does not directly dissolve cholesterol, clean clogged arteries or cure cardiovascular disease.

However, adequate hydration supports blood volume, circulation, kidney function, temperature regulation and normal cellular processes.

Maintaining good hydration is one part of a healthy lifestyle, alongside balanced nutrition, physical activity and monitoring blood pressure, blood glucose and cholesterol.



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