Vomiting, diarrhea, and fever can cause fluid losses very quickly in young children.
People With Diabetes
Uncontrolled diabetes can cause frequent urination and increase fluid loss.
People Taking Diuretics
Some medications increase urination and can make dehydration more likely.
People Exercising or Working in Heat
Heavy sweating increases fluid needs, particularly in hot and humid conditions.
How Much Water Do You Actually Need?
There is no single number that is perfect for everyone.
Fluid needs vary according to:
Body size
Climate
Exercise
Pregnancy
Diet
Illness
Medications
Kidney and heart function
Water is not the only source of hydration. Other drinks and water-rich foods such as fruits and vegetables also contribute.
Healthy people can often use thirst and urine color as practical guides, although thirst becomes less reliable with age.
Do You Really Need Eight Glasses a Day?
