A day of low fluid intake — 0 seconds

Follow how the body defends its water over a day when fluid intake stays low.

Representative model

Change event

Loading interactive anatomy

Low intake begins · 00:00:00
A small deficit builds · 04:00:00
Water conservation ramps up · 08:00:00
Thirst and blood concentration rise · 13:00:00
Urine is highly concentrated · 18:00:00
One day on · 24:00:00

Happening now

Fluid intake is low while the usual routes of water loss carry on.

Explore the mechanism Water keeps leaving

Water leaves the body through the kidneys, the skin, the breath and the gut, even when little is coming in.

Evidence for this step

Water typically leaves the body without pause through the kidneys, skin, breathing and the gut, so a day with little fluid intake usually produces a net body-water deficit. moderate · View sources

Body response overview

Body-water deficit (share of starting body mass)

0–0of 1steady

Blood concentration (plasma osmolality)

steadysteady

Water-conserving hormone signal (vasopressin)

steadysteady

Urine volume

steadysteady

Urine concentration

steadysteady

Thirst

No unusual thirst shownsteady

Model status

Representative modelEducational only

Educational physiology only; not medical advice, diagnosis or treatment guidance.

This event shows a representative pattern, not a personal prediction.
The measured anchors come from small controlled studies in healthy adults, and group averages hide wide differences between people.
Values between the study's measured time points are interpolated for teaching and were not measured.
Organ activity levels are a display intensity for the illustration, not a measured rate.
This event describes mechanism only. It does not state how much any person should drink.