The benefits of drinking enough water

What is the big deal about drinking enough water?  I did some research and here is what I found:

Our body is 60-75% water and we are constantly breathing it out of our mouth.  It needs to be replenished. 

By the time you are thirsty, you are already dehydrated!

Sometimes when you feel hungry, it may actually be thirst.  Drink some first and see what you think.

Lack of water can cause fatigue and headaches (your brain is 90 %water).

Some of the waste from our body is carried out by urine.  Not enough water, not enough cleansing.

Our blood can get dehydrated, causing problems.  Water carries nutrients and oxygen to our cells.  Don't interrupt that!

Water helps regulate our body temperature.

Water protects and moisturises our joints.

Dry skin can be a sign of dehydration.

Dark colored urine and constipation are indications you are not drinking enough water.

This is making me thirsty!!!  Go get a drink of water.

Some sites I read:
http://www.lifehack.org/articles/lifehack/10-reasons-to-drink-more-water.html
http://www.mangosteen-natural-remedies.com/benefits-of-drinking-water.html

http://www.centralbasin.org/blog/