They might lose water via sweat. Also, a lot of water as water vapor is lost by breathing.
Not really. After you drink water, your body fluids come back. But you might lose a little bit weight.
you get dehydrated (lose body water) by doing lots of exercise or doing a tiring activity
you might actually gain
The body can lose about 10-15 of its water before death occurs.
The water loss is due to sweating to cool the body.
By sweating and peeing.
you get dehydrated (lose body water) by doing lots of exercise or doing a tiring activity
by sweeting and by peeing
they pee
Water and Salt
A three day juice fast is a very unhealthy way to lose weight. You might lose water weight in the short term, but any calories you consume after that are going to be stored by the body - in this case as fat.
Adults lose nearly two to three quarts (12 cups) of water every day.