The Human Body

Water Composition

The percentage of the body that is water is not a stable figure, it varies according to how well hydrated we are. The problems of dehydration in older people, for example can be demonstrated when we consider that at birth a baby is usually between 75% and 80% water, whereas people in their nineties are often less than 30% water. This is often because the thirst reflex becomes less efficient as we age and, in any case, thirst itself is an indication that you are failing to keep yourself properly hydrated and not just a signal to drink.

Water Content

Water is always of utmost importance to the body, the following information should serve as guidance.

Our Body Water Composition Tables: Part 1, Part 2, Part 3

The reference tables above detail the main parts of the human body, their function, percentage of water and also details the importance of adequate hydration for each.