There is no doubt that drinking water is extremely important for maintaining overall health. Water is one of the major components of the human body. The amount of water in our body ranges from 50-75%, infants usually have a higher percentage.
Most of us think we drink enough water on a given day, the fact is we may not we may not. Most of the daily intake comes from food and beverages. The National Academies of Sciences, Engineering, and Medicine recommends for women at approximately 2.7 liters (91 ounces) of total water from all beverages and foods each day, and men an average of approximately 3.7 liters (125 ounces daily) of total water. Another way of calculating the total amount is- half of the body weight in ounces, so if someone is 200 lbs. he or she should drink at least 100 ounces of water in a given day.
Remember to adjust your daily water intake based on your physical activity, weather, and physical or medical condition. Pregnant and breastfeeding women need a higher intake. Someone who is vomiting or has diarrhea also needs to drink extra water to stay hydrated.
Here comes the big question: is there any relationship between water intake and weight loss? Michael Boschmann and his colleagues have shown that drinking 2 liters of water per day would augment energy expenditure by approximately 400 kJ (1). So, water increases metabolism which is helpful for weight loss. Another study has shown a direct correlation between intake of water and weight loss in 12 week period (2). A number of other studies have shown that water is a key component for maintenance of healthy body weight and weight loss (3, 4).
Bottom line is: stay hydrated, stay healthy.