Body Temperature Water is your body's coolant regulating your body temperature through perspiration. Sweating keeps you from overheating, especially during exercise and hot weather. It's also important to remember that your body needs as much water in cold weather as it does in hot weather. Heat exhaustion can occur when your body doesn't have enough water to regulate your body temperature. Symptoms include excessive perspiration, dizziness, fatigue, headache, nausea and vomiting.
Water is an important key to concentration.
When your body is well hydrated, you will notice an increase clarity in thinking. With less water the level of energy generation in the brain is decreased. Depression, headaches, memory loss and chronic fatigue syndrome are frequent symtoms of dehydration. Good hydration increases the efficiency of your cardiovascular system. Hardening of the arteries, high blood pressure and cholesterol may all be lowered by an increase in water consumption.