What nutrient constitutes the largest percentage of the human body?

Water constitutes the largest percentage of the human body, making up about 60% to 70% of an adult's total body weight. It plays a critical role in various biological processes, including temperature regulation, nutrient transport, and waste elimination. Water is vital for maintaining homeostasis and supports the functioning of cells, tissues, and organs.

While proteins, fats, and carbohydrates are essential nutrients that contribute to overall health and body function, they do not make up as large a proportion of body weight compared to water. Proteins are important for building and repairing tissues, fats are a key source of energy and essential fatty acids, and carbohydrates primarily serve as an energy source. However, their percentages in the body are significantly lower than that of water. Thus, recognizing the pivotal role of water in the human body underscores its status as the most abundant nutrient.