A person can survive for weeks or even months without food, but without water, they will die within days. This shows how important water is to the human body. But what is the main function of water in the body?
A person's need for water is second only to oxygen. Water is a substance necessary for all life activities. Water has many physiological functions. In addition to being a major component of the human body, it is the carrier for various nutrients ingested by the body. Without water, other nutrients are like mud and sand dried on a parched riverbed, losing their function; waste products generated by material metabolism in the body are also transported by water and excreted through feces, urine, sweat, and respiration; water regulates body temperature through evaporation or sweating; water can also moisturize the skin, lubricate joints and other tissues. 60% of an adult man's body weight is water, while for women it is 50%-55%. It is clear that water is the most abundant component in the human body.
Summary: A person's need for water is second only to oxygen. Water is a substance necessary for all life activities. 60% of an adult man's body weight is water, while for women it is 50%-55%. It is clear that water is the most abundant component in the human body.
Due to the important functions of water in life activities and its status as a basic component of the diet, which must be obtained from food, it is often regarded as a nutrient. However, some nutrition professionals disagree with classifying water as a nutrient. This is a professional debate. In any case, humans cannot do without water. The sources of water in the body include drinking water, water from food, and metabolic water. Metabolic water mainly comes from the water produced during the metabolism of proteins, fats, and carbohydrates. A person's daily water requirement varies greatly depending on temperature, physical condition, work conditions, and environmental conditions. Generally speaking, in addition to the water contained in food and metabolic water, it is more appropriate for primary and middle school students to drink 1200-1500 milliliters of water per day. Of course, if it is summer or after strenuous exercise and heavy sweating, the water requirement can be greater, and it is important to replenish it in a timely manner.
Summary: For ordinary people, it is not important whether water is considered a nutrient; what is important is that we must drink water every day. A person's daily water requirement varies greatly depending on temperature, physical condition, work conditions, and environmental conditions. It is more appropriate for primary and middle school students to drink 1200-1500 milliliters of water per day.
What is healthy drinking water? Qualified tap water should be the main source of drinking water.
In addition, there are purified water and mineral water. Purified water has over 98% of its minerals and organic substances removed through certain processes and adsorption. Mineral water is groundwater from hundreds of meters underground, containing a large amount of mineral elements such as calcium, magnesium, sulfur, silicon, lithium, strontium, selenium, zinc (of course, the content of each element varies in different mineral waters) and carbon dioxide. Although the main source of essential nutrients for the human body is food, inorganic salts and trace elements in water are still one of the sources for the human body and are very beneficial. For special populations, such as infants, the elderly, and certain patients, if their diet is not balanced, they also need to obtain some minerals from drinking water. The primary consideration when choosing what water to drink is safety. Remember that the main function of drinking water is to replenish the body's fluids. Replenishing fluids should be done in small, frequent amounts; it's best to drink a small cup at a time. Gulping down a large bottle of water after exercise is not the right way to do it.