Hydration: Water and the Body

Explanation: The adult human body is about 60% water. This percentage varies by age, sex, and body composition. Infants can contain up to 75% water.

Explanation: It is generally recommended to drink about 1.5 to 2 liters of water per day for an adult. This need can vary depending on physical activity, climate, and health status.

Explanation: The brain is about 75% water, making it one of the most hydrated organs. Even mild dehydration can affect cognitive functions.

Explanation: Thirst is usually the first signal our body sends to indicate a need for hydration. However, when you feel thirsty, you are already slightly dehydrated.

Explanation: Pale yellow, almost transparent urine indicates good hydration. Dark urine may indicate dehydration and a need to drink more water.

Explanation: Urine is the main way the body eliminates water, about 1 to 1.5 liters per day. Sweat, breathing, and stool also contribute to water loss.

Explanation: Cucumber is about 96% water, making it one of the most hydrating foods. Fruits and vegetables are excellent supplementary sources of hydration.

Explanation: Water remains the most effective drink for hydration as it is quickly absorbed by the body without caloric intake. Other drinks may contain sugar or substances that slow absorption.

Explanation: A human can generally survive 3 to 5 days without water, depending on environmental conditions. In comparison, one can survive several weeks without food. Water is therefore more essential than food in the short term.

Explanation: Dehydration reduces blood volume, making blood thicker and forcing the heart to work harder. This can lead to fatigue, headaches, and decreased physical and mental performance.