Water is not only found on earth but also in the whole universe. Nearly, 70% of the earth is covered with water. About two-thirds of a person's body is composed of water and approximately, 75% of the brain consists of water. Loss of water from the body is called 'dehydration'. Dehydration can result in 1% reduction of the total body weight. Water is lost from the body through lungs, skin (in the form of sweat), urine and stools. This water must be replaced by consuming fluids and food.
An adult requires about two liters of water everyday. Water can be obtained by consuming plain water, water in food, metabolism of food and consumption of other fluids like milk and juices.
The body may require excess water in conditions like excess physical activity, dehydration, high temperature, low humidity, and consumption of a high-fiber diet, alcohol or caffeine consumption.
Benefits of Water
Water is considered a "very essential ideal solvent" as it plays a medium to almost all functions taking place in the body. The human blood plasma consists of about 90% of water. Some of the benefits of water including the following:
- Digestion, absorption and transportation of nutrients from one part of the body to another.
- Has a cooling effect and maintains body temperature when the body suffers from heat cramps, heat exhaustion and heat stroke.
- Acts as a lubricant for joints and provides a cushioning effect for vital organs and tissues.
- Carries waste products from cells and helps in the process of excretion.
- Prevents constipation, which is very important in reducing the risk of diseases related to colon.
Sources of Water
Many foods contain water. A balanced diet is required to maintain the body fluid needs. Some of the good sources of water include the following:
- Fruits and vegetables (contain 95% of water)
- Meat and cheese (contain 50% of water)
- Soups and juices