What You Should Know About How Much Water to Drink
Hydration advice is often presented as a simple rule, but in reality, how much water a person needs varies from one individual to another. In a recent episode of CNA938 Wellness Hour, DJ Cheryl Goh spoke with Dr Fiona Wu, Senior Consultant Urologist and Medical Director at AARE Urocare, on common hydration myths and how they may affect kidney and urinary health.
Listen to the full episode here!
Is eight glasses a day the right amount
The commonly quoted “eight glasses a day” guideline is a general reference point rather than a strict requirement. Hydration needs depend on factors such as body size, activity level, environment, and overall health.
For example, individuals who exercise regularly, spend long hours outdoors, or live in humid climates may require more fluids. On the other hand, excessive fluid intake beyond the body’s needs does not necessarily provide additional benefit and may place unnecessary strain on the body.
Can drinking more water improve kidney health
Water plays an important role in supporting kidney function by helping the body remove waste products through urine. Adequate hydration may also reduce the risk of certain conditions such as kidney stones in some individuals.
However, more is not always better. Drinking excessive amounts of water does not “flush” the kidneys beyond their natural capacity. Instead, the body regulates fluid balance through complex physiological mechanisms involving the kidneys and hormones.
Are all fluids equal
Hydration does not come from water alone, but not all beverages have the same effect on health.
Dr Fiona Wu highlighted that drinks such as:
- Sweetened beverages
- Bubble tea
- Energy drinks
- Sugary coffee or tea
may contribute to overall fluid intake but also introduce added sugars and calories. Regular consumption of these drinks may have broader health implications, including metabolic effects, which can indirectly affect kidney and urinary health over time.
How do you know if you are drinking enough
Rather than following a fixed number, individuals can look for general signs of adequate hydration. These include:
- Passing urine regularly
- Light coloured urine
- Absence of persistent thirst
Hydration needs may also change during illness, physical activity, or exposure to heat.
Can too much water be harmful
While uncommon, excessive water intake over a short period may dilute the body’s sodium levels, leading to an imbalance known as hyponatremia. This highlights the importance of maintaining balance rather than aiming for excessive intake.
Hydration and urinary health
From a urological perspective, maintaining appropriate hydration supports:
- Regular urine flow
- Dilution of waste products
- Reduction of urinary irritation in some individuals
However, urinary symptoms such as frequency, urgency, or discomfort should not be managed by increasing fluid intake alone. These symptoms may require proper assessment to determine the underlying cause.
Key takeaway
Hydration is important, but it is not one size fits all. General rules such as “eight glasses a day” may be useful as a guide, but individual needs vary. Both insufficient and excessive fluid intake can affect the body.
As shared by Dr Fiona Wu, understanding how hydration works helps individuals make informed decisions rather than relying on common myths.
Medical Disclaimer
This article is for general educational purposes only and does not replace professional medical advice, diagnosis, or treatment. The suitability of any lifestyle or medical advice should be determined by a licensed medical practitioner following an individual consultation.