The human body is well equipped to maintain an adequate level of hydration through the various biological feedback control mechanisms of homeostasis. However, this regulation relies on an adequate supply of water. While there is much mythology surrounding how many glasses of water we each must drink daily to stay healthy. Many people sip at a water bottle throughout the day in the belief that this will keep them well hydrated without considering the possibility that it might nudge their systems to expect such levels of water consistently and so when they have no access to their bottle they feel far more thirsty and suffer a feeling of dryness more than another individual who drinks water only when they feel thirsty and is perfectly well hydrated nevertheless.
Of course, the problem with recommendations for how much we each need and when we should drink it varies from person to person, changes with body weight, environment and specifically temperatures and humidity, personal fitness level, physical activity, age, and illness.
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