If you are not getting enough water, your body becomes dehydrated. Dehydration is the cause of many major healthy issues such as kidney problems, high cholesterol, and weight gain.
Your digestion is also highly effected by lack of water. Your colon needs water to maintain proper digestion, and without it can lead to other issues including ulcers.
Sometimes the reason you feel tired or hungry is just because you need to be drinking water. Every body is different. The amount of water that we need is different too. The usual recommendation is 1/2 ounce daily for every pound of weight. Listen to your body. Details below: