Photo: Leon Natan

At what age do you have the most water in your body?

Babies and children have a higher percentage of water than adults. When babies are born, they are about 78 percent water, but this falls to 65 percent by the age of 1 year. Fatty tissue has less water than lean tissue. Men have more water than women, as a percentage.

medicalnewstoday.com - What percentage of the human body is water? - Medical News Today

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Most of the human body is water, with an average of roughly 60%. The amount of water in the body changes slightly with age, sex, and hydration levels. While the average percentage of water in a person’s body is around 60%, the percentage can vary from roughly 45–75%. For example, babies have a high percentage of water in their bodies, which decreases with age. Also, fatty tissue contains less water than muscle, so the percentage of water can vary with body type. Water is essential for health and is necessary for numerous bodily functions. These include: temperature regulation

cellular function

waste removal People can maintain the balance of water in their bodies by drinking fluids throughout the day. They may need to drink more water after exercise and in hot weather. This article will discuss the percentage of water in the human body, why it varies, and why it is important. Body water percentage chart Share on Pinterest A person’s age, sex, and hydration levels may affect the percentage of water in their body. The percentage of water in the body varies slightly, depending on factors such as age and sex, but is usually within the 45–75% range. There is more water in lean muscle than there is in fatty tissue. Typically, a female body contains a lower percentage of water than a male one. This is due to females having a higher percentage of fat. This water distribution means that people with a higher percentage of body fat are likely to have a lower percentage of water in their bodies. The percentage of water in the body changes with age. Babies have a very high percentage of water in their bodies, while older adults have less. The following tables give the average percentages and ranges of water in the body, according to sex and age: Age 12–18 years Age 19–50 years Age 51 years and older Male Average: 59%

Range: 52–66% Average: 59%

Range: 43–73% Average: 56%

Range: 47–67% Female Average: 56%

Range: 49–63% Average: 50%

Range: 41–60% Average: 47%

Range: 39–57% Birth to 6 months 6 months to 1 year 1–12 years Infants and children Average: 74%

Range: 64–84% Average: 60%

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Range: 57–64% Average: 60%

Range: 49–75% Body size, shape, and balance of muscle and fat can all affect the percentage of water in a person’s body. Where is water in the body Water exists throughout the body. Cells contain 60% of all water in the body, with roughly one-third of the remainder, surrounding the cells. Some organs contain much more water than others. The brain and kidneys possess the highest percentage of water; the bones and teeth contain the lowest proportion. The chart below gives the highest to the lowest percentages of water: Body part Water percentage Brain 80–85% Kidneys 80–85% Heart 75–80% Lungs 75–80% Muscles 70–75% Liver 70–75% Skin 70–75% Blood 50% Bones 20–25% Teeth 8–10% Regardless of water content, all parts of the body need water to work properly. How to calculate body water percentage There is a range of scientific methods to calculate body composition, including the percentage of water. People can use online calculators to determine the percentage of water in the body. They can also use the Watson formula to calculate total body water in liters. Watson formula for males 2.447 – (0.09156 x age) + (0.1074 x height in centimeters) + (0.3362 x weight in kilograms) = total body weight (TBW) in liters. Watson formula for females –2.097 + (0.1069 x height in centimeters) + (0.2466 x weight in kilograms) = total body weight (TBW) in liters. To get the percentage of body water, people can assume 1 liter equals 1 kilogram and then divide TBW by weight. This can provide a rough estimate of whether a person is in a healthy range for percentage of body weight. How to maintain a healthy percentage It is essential to drink enough water to support all functions of the body. Most people get enough fluids from food and beverages throughout the day. They should always drink more fluids in hot weather or after exercise. The Centers for Disease Control and Prevention (CDC) also recommend : carrying a water bottle for easy access

choosing water instead of sugar-sweetened beverages

choosing water when eating a meal out

adding a wedge of lemon or lime to water to improve taste Some tips for older adults specifically include : not waiting until feeling thirst to drink fluids

drinking a glass of water before and after exercise

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taking a sip of water between each bite of food at meals

drinking a full glass of water when taking medication There is no set daily amount of fluid that a person should drink. The amount varies, depending on age, sex, weight, health, physical activity, and the climate where a person lives. As an approximate guide, the minimum fluid intake is as follows: Age Recommended fluid intake (milliliters per day) 0–6 months 700 6–12 months 800 1–2 years 1,300 4–8 years 1,700 9–13 years (males) 2,400 9–13 years (females) 2,100 14–18 years (males) 3,300 14–18 years (females) 2,300 Adult male 3,700 Adult female 2,700 During pregnancy 3,000 While breastfeeding 3,800 How to avoid dehydration Dehydration is more likely in a warmer climate or hot weather. A person should always make sure to drink extra fluids in the heat. Similarly, exercise can cause dehydration because the body uses more fluid and loses water through sweat. Older adults may gradually lose some of their sense of thirst. A good rule of thumb is to drink fluids throughout the day. Once a person feels thirsty, they may already be slightly dehydrated. How much water is too much? Water toxicity happens when there is too much water in the body. This can dilute essential electrolytes in the blood, cause cells to swell, and put pressure on the brain. Drinking too much water is difficult. There have been cases of water poisoning in people who drank a lot of water in a very short space of time. This may be during endurance sports because of heat stress, or when using recreational drugs that increase thirst. There is no clear limit for drinking too much water. The kidneys can remove 20–28 liters of water per day, but they cannot excrete more than 0.8 to 1.0 liters per hour. Drinking more than this can be harmful. Click here to learn more about water intoxication.

medicalnewstoday.com - What percentage of the human body is water? - Medical News Today

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