In freediving, we may need to consume more water than usual due to a combination of several factors. These factors are: the sensation of urinating as a result of the mammalian diving reflex, sweating in the wetsuit and exhaling through the mouth.
Urinating, which is the result of the mammalian diving reflex, usually causes you to expel more fluid in the form of urine than you take in by mouth.
Mouth breathing contains water vapor, and mouth breathing can cause too much water loss from the body.
And if we're getting hot in your wetsuit, you can also lose fluid through sweating.
As a result of these three factors, we can easily become dehydrated in freediving. I recommend that you avoid plastic bottles and bottles with broken labels when you take water with you for freediving. These can cause unnecessary environmental pollution. Freediving in dirty and waste-filled waters is not very enjoyable. Reusable water bottles can be used instead of plastic bottles.
The decrease in the body's water level can cause a decrease in your diving performance. Dehydration also causes the blood to thicken, which causes the heart to work harder to pump blood throughout the body. Thus the heart consumes more oxygen and slows down mental processes. It is important not to be dehydrated before diving, to continue to drink a small amount of water during the dive and to continue to drink plenty of water afterwards.