Health observers have raised concerns that a large proportion of Nigerians may be living with chronic dehydration without realising it, warning that widely repeated advice to drink “eight glasses of water a day” fails to reflect individual hydration needs or the realities of the country’s hot climate.
Specialists note that daily fluid requirements vary significantly depending on body weight, physical activity, and environmental conditions. In tropical regions such as Nigeria, where heat and humidity are high year-round, hydration needs can exceed standard global recommendations.
Why Dehydration Is So Common
Many people rely heavily on sugary soft drinks, caffeinated beverages, or occasional sachet water consumption rather than consistent water intake. Medical guidance indicates that thirst is not an early warning sign but a late one — meaning the body may already be mildly dehydrated by the time a person feels thirsty.
Mild dehydration can manifest through fatigue, headaches, poor concentration, and dark-coloured urine. Over longer periods, insufficient fluid intake may place strain on the kidneys and increase the likelihood of developing kidney stones.
Calculating Actual Water Needs
Health professionals commonly estimate daily water requirements using body weight as a baseline measurement. A widely accepted guideline recommends approximately 35 millilitres of water per kilogram of body weight per day.
For example:
A person weighing 70kg requires about 2.45 litres daily as a base level.
An additional 500ml should be added for every 30 minutes of moderate exercise.
In hot or humid climates, experts advise adding 500ml to 1 litre beyond the baseline.
Under these conditions, a 70kg individual engaging in light activity in a hot city environment could require up to 3.5 litres daily, considerably higher than the commonly cited two-litre standard.
Warning Signs of Inadequate Hydration
Health professionals highlight several indicators that fluid intake may be insufficient:
Dark yellow or strong-smelling urine
Recurring headaches with no clear cause
Afternoon fatigue despite adequate sleep
Dry lips and skin
Constipation or infrequent bowel movements
Practical Hydration Strategies
Experts recommend simple daily habits to maintain proper hydration:
Drink about 500ml of water first thing in the morning
Carry a reusable bottle to monitor intake
Consume water-rich fruits and vegetables such as watermelon, cucumber, oranges, and tomatoes
Drink at regular intervals rather than waiting for thirst
Increase intake by at least 1 litre when consuming alcohol, which has dehydrating effects
Drink an extra 500ml before outdoor exercise, especially in afternoon heat
Call for Personalised Hydration Targets
Health advocates emphasise that personalised hydration planning is more reliable than generic advice. Calculating daily fluid needs based on weight, lifestyle, and climate conditions can provide a more accurate target and help prevent both short-term symptoms and long-term health risks.
Public Health Question: Do you monitor how much water you drink each day, or do you rely solely on thirst as your guide?
