Dehydration tends to be even more problematic for the very young and the elderly (some estimated that the average person over age 55 is dehydrated). Dehydration can contribute to problems such as: Acid-alkaline imbalance, Constipation, High blood pressure, Immune suppression, Weight gain, and Wrinkling of skin and internal body organs. By the time you feel thirsty, you are likely already dehydrated, so drinking to thirst is likely not your best bet. How much water do you need on a daily basis? That will depend on factors such as: Some are now advocating that instead of counting out eight glasses of water, a better formula is to take in enough water to pea one or two pale urines per day. (Discuss with your physician or healthcare provider if you a condition that must limit water intake.) Of the six categories of essential nutrients, staying hydrated may be the one I track most closely.