Water makes up about 40-62% of your total body weight, and every organ needs water to function properly. After a night of sleep, it\u2019s normal to be slightly dehydrated. Drinking water first thing in the morning supports hydration, which is crucial for overall health.\n<\/p>\n
Dehydration affects blood flow to the brain, which can make it harder to think clearly, focus, remember information, and make decisions.\n<\/p>\n
A 2020 study found that not drinking water for 12 hours can make it harder to think clearly and make decisions. When participants drank 500 milliliters of water before a cognition test, they performed better on tasks that required them think instead of responding automatically.\n<\/p>\n
Another 2021 study showed that not drinking water for 12 hours reduced alertness<\/a> and reaction time. Drinking 500 milliliters of water before bed and 500 milliliters in the morning improved alertness and reaction speed.\n<\/p>\n The body produces a hormone called vasopressin when you are dehydrated. This hormone tells the body to retain water, concentrate urine, and regulate blood pressure.\n<\/p>\n Chronically high vasopressin is linked to higher blood sugar, insulin resistance,<\/a> and higher blood pressure.\n<\/p>\n Drinking more water can help lower vasopressin. A 2018 study showed that increasing water intake, especially in people who normally drink very little, reduced copeptin (the marker used to measure vasopressin) by about 41%.\n<\/p>\n Another 2019 study showed that increasing water intake by 1.5 liters per day for six weeks significantly lowered copeptin levels.\n<\/p>\n Dehydration causes vasopressin production. Vasopressin tightens blood vessels, which can increase blood pressure if levels are too high. Staying hydrated helps reduce vasopressin production, supporting healthy blood pressure<\/a> and overall heart health.\n<\/p>\n A 2024 study showed that drinking 6\u20138 cups of water per day may reduce the risk of hypertension (high blood pressure) compared to people who consume too little.\n<\/p>\n Drinking enough water is essential for kidney health. Water helps the kidneys remove waste and toxins and maintain balanced fluids in the body. Staying hydrated helps the kidneys function properly<\/a>.\u00a0\n<\/p>\n Studies suggest that drinking enough water can reduce the risk of kidney stones and urinary tract infections.\n<\/p>\n Skin hydration is influenced by both internal and external factors<\/a>. A 2015 study showed that drinking more water can help keep the skin moisturized.\n<\/p>\n However, another 2024 study found that while drinking enough water supports the skin, using moisturizers is more effective for improving skin hydration and barrier function.\n<\/p>\n Some evidence shows that water may provide a small benefit for weight management.\n<\/p>\n